diff --git a/abstract-document/pom.xml b/abstract-document/pom.xml
index 072ff5432..d1b10a9fd 100644
--- a/abstract-document/pom.xml
+++ b/abstract-document/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
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     <artifactId>abstract-document</artifactId>
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diff --git a/abstract-factory/pom.xml b/abstract-factory/pom.xml
index 13ec80067..6d94e70ce 100644
--- a/abstract-factory/pom.xml
+++ b/abstract-factory/pom.xml
@@ -29,7 +29,7 @@
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   <artifactId>abstract-factory</artifactId>
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diff --git a/adapter/pom.xml b/adapter/pom.xml
index 32260ba3e..95ccee3a9 100644
--- a/adapter/pom.xml
+++ b/adapter/pom.xml
@@ -29,7 +29,7 @@
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diff --git a/aggregator-microservices/aggregator-service/pom.xml b/aggregator-microservices/aggregator-service/pom.xml
index a5192047b..fb26ff954 100644
--- a/aggregator-microservices/aggregator-service/pom.xml
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diff --git a/aggregator-microservices/information-microservice/pom.xml b/aggregator-microservices/information-microservice/pom.xml
index a3ddb763c..7afce1e9b 100644
--- a/aggregator-microservices/information-microservice/pom.xml
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index e7b4000ab..0d44b037e 100644
--- a/aggregator-microservices/inventory-microservice/pom.xml
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index ffa80e442..ed48768f2 100644
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diff --git a/api-gateway/api-gateway-service/pom.xml b/api-gateway/api-gateway-service/pom.xml
index d54bdb90c..609fca88d 100644
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diff --git a/api-gateway/image-microservice/pom.xml b/api-gateway/image-microservice/pom.xml
index 2feab1060..e90747eb9 100644
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diff --git a/api-gateway/price-microservice/pom.xml b/api-gateway/price-microservice/pom.xml
index 4dc770340..deb0627f4 100644
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index 5dc30bfce..c29062630 100644
--- a/async-method-invocation/pom.xml
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index 05eac928d..e16065359 100644
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diff --git a/bridge/pom.xml b/bridge/pom.xml
index 0c1908ba2..8ab24c159 100644
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index 578a9f649..b17d53030 100644
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index 78c64f472..d48faeff4 100644
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diff --git a/caching/pom.xml b/caching/pom.xml
index 6452f7c76..57f8f0119 100644
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diff --git a/callback/pom.xml b/callback/pom.xml
index f35ad9bf5..387c8a667 100644
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index 45f46636e..07b1a5e4a 100644
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index ab0eba18c..68d4b2064 100644
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diff --git a/composite/pom.xml b/composite/pom.xml
index b72522109..944aa1456 100644
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diff --git a/converter/pom.xml b/converter/pom.xml
index eff4eab5a..f696048f5 100644
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diff --git a/cqrs/pom.xml b/cqrs/pom.xml
index b69fa04b3..7ed2e1208 100644
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diff --git a/dao/pom.xml b/dao/pom.xml
index 5d353e039..3700d76a7 100644
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diff --git a/data-bus/pom.xml b/data-bus/pom.xml
index 72f99168a..6292b71fb 100644
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diff --git a/data-mapper/pom.xml b/data-mapper/pom.xml
index 07bbb6f8f..aadcabd3d 100644
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diff --git a/data-transfer-object/pom.xml b/data-transfer-object/pom.xml
index fd414e596..17ad1f83f 100644
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diff --git a/decorator/pom.xml b/decorator/pom.xml
index 2e1125506..d4e2a887d 100644
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index 0d99d8a2c..6c7c710d5 100644
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diff --git a/dependency-injection/pom.xml b/dependency-injection/pom.xml
index 767b4066d..e8a499918 100644
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diff --git a/double-checked-locking/pom.xml b/double-checked-locking/pom.xml
index b467cf36a..7efd3c31e 100644
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index 7db852d6b..c64ab4ce9 100644
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diff --git a/eip-aggregator/pom.xml b/eip-aggregator/pom.xml
index 56e3d326d..3b043ad7e 100644
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index f2ccd8172..ed16337da 100644
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index 9edc9d1a2..752d43077 100644
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diff --git a/event-aggregator/pom.xml b/event-aggregator/pom.xml
index d061e37a5..a39738bf8 100644
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 		<groupId>com.iluwatar</groupId>
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diff --git a/event-asynchronous/pom.xml b/event-asynchronous/pom.xml
index 2c24f64e7..9398d25ce 100644
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diff --git a/event-driven-architecture/pom.xml b/event-driven-architecture/pom.xml
index fcd9a5e93..87aae0070 100644
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diff --git a/event-queue/pom.xml b/event-queue/pom.xml
index 647801947..a0c1913a7 100644
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index 0b3aad20e..785d72c68 100644
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index 65c6c2cb8..358f4eae4 100644
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diff --git a/extension-objects/pom.xml b/extension-objects/pom.xml
index f142b1130..74f233775 100644
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index fcfd4fc6a..d0c459428 100644
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index bdbbabba2..1c8f4248e 100644
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index cb5e1687d..124b1a73c 100644
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diff --git a/feature-toggle/pom.xml b/feature-toggle/pom.xml
index 43a9b45a9..3c6c7af94 100644
--- a/feature-toggle/pom.xml
+++ b/feature-toggle/pom.xml
@@ -30,7 +30,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/fluentinterface/pom.xml b/fluentinterface/pom.xml
index a52a3d1c7..a91832786 100644
--- a/fluentinterface/pom.xml
+++ b/fluentinterface/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/flux/pom.xml b/flux/pom.xml
index 098e816a1..59d105b39 100644
--- a/flux/pom.xml
+++ b/flux/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>flux</artifactId>
   <dependencies>
diff --git a/flyweight/pom.xml b/flyweight/pom.xml
index 22721ae05..adf675b57 100644
--- a/flyweight/pom.xml
+++ b/flyweight/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>flyweight</artifactId>
   <dependencies>
diff --git a/front-controller/pom.xml b/front-controller/pom.xml
index e45e17b94..b76852e02 100644
--- a/front-controller/pom.xml
+++ b/front-controller/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>front-controller</artifactId>
 	<dependencies>
diff --git a/guarded-suspension/pom.xml b/guarded-suspension/pom.xml
index de8e29804..6b8b977eb 100644
--- a/guarded-suspension/pom.xml
+++ b/guarded-suspension/pom.xml
@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <packaging>jar</packaging>
   <artifactId>guarded-suspension</artifactId>
diff --git a/half-sync-half-async/pom.xml b/half-sync-half-async/pom.xml
index 777e8e80b..e6df33018 100644
--- a/half-sync-half-async/pom.xml
+++ b/half-sync-half-async/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>half-sync-half-async</artifactId>
   <dependencies>
diff --git a/hexagonal/pom.xml b/hexagonal/pom.xml
index 294c150ef..e6084ac70 100644
--- a/hexagonal/pom.xml
+++ b/hexagonal/pom.xml
@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>hexagonal</artifactId>
   <dependencies>
diff --git a/intercepting-filter/pom.xml b/intercepting-filter/pom.xml
index 267c5c3cb..658dba671 100644
--- a/intercepting-filter/pom.xml
+++ b/intercepting-filter/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>intercepting-filter</artifactId>
   <dependencies>
diff --git a/interpreter/pom.xml b/interpreter/pom.xml
index 815d15a37..1e61dfb48 100644
--- a/interpreter/pom.xml
+++ b/interpreter/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>interpreter</artifactId>
   <dependencies>
diff --git a/iterator/pom.xml b/iterator/pom.xml
index 51e84cac0..6581b8224 100644
--- a/iterator/pom.xml
+++ b/iterator/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>iterator</artifactId>
   <dependencies>
diff --git a/layers/pom.xml b/layers/pom.xml
index 4283376d4..9ca1c58e7 100644
--- a/layers/pom.xml
+++ b/layers/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<groupId>com.iluwatar.layers</groupId>
 	<artifactId>layers</artifactId>
diff --git a/lazy-loading/pom.xml b/lazy-loading/pom.xml
index c0e3bc8a4..6664ddcc7 100644
--- a/lazy-loading/pom.xml
+++ b/lazy-loading/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>lazy-loading</artifactId>
   <dependencies>
diff --git a/marker/pom.xml b/marker/pom.xml
index 8f4bb7ae6..138ab0c30 100644
--- a/marker/pom.xml
+++ b/marker/pom.xml
@@ -24,7 +24,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <modelVersion>4.0.0</modelVersion>
 
diff --git a/mediator/pom.xml b/mediator/pom.xml
index 125f5a6c7..77c29adda 100644
--- a/mediator/pom.xml
+++ b/mediator/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>mediator</artifactId>
   <dependencies>
diff --git a/memento/pom.xml b/memento/pom.xml
index b4fb1d2c4..ad4a55236 100644
--- a/memento/pom.xml
+++ b/memento/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>memento</artifactId>
   <dependencies>
diff --git a/message-channel/pom.xml b/message-channel/pom.xml
index 2f93cd387..28568e6c6 100644
--- a/message-channel/pom.xml
+++ b/message-channel/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>message-channel</artifactId>
 	<dependencies>
diff --git a/model-view-controller/pom.xml b/model-view-controller/pom.xml
index 89f51086f..89f7bd825 100644
--- a/model-view-controller/pom.xml
+++ b/model-view-controller/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>model-view-controller</artifactId>
   <dependencies>
diff --git a/model-view-presenter/pom.xml b/model-view-presenter/pom.xml
index f708ebce5..d4db8a633 100644
--- a/model-view-presenter/pom.xml
+++ b/model-view-presenter/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>model-view-presenter</artifactId>
   <name>model-view-presenter</name>
diff --git a/module/pom.xml b/module/pom.xml
index be5f67743..1b1ecb6af 100644
--- a/module/pom.xml
+++ b/module/pom.xml
@@ -28,7 +28,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>module</artifactId>
 	<dependencies>
diff --git a/monad/pom.xml b/monad/pom.xml
index 15303d941..947259602 100644
--- a/monad/pom.xml
+++ b/monad/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
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     </parent>
     <artifactId>monad</artifactId>
     <dependencies>
diff --git a/monostate/pom.xml b/monostate/pom.xml
index f8cfc5122..94935cbf0 100644
--- a/monostate/pom.xml
+++ b/monostate/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>monostate</artifactId>
   <dependencies>
diff --git a/multiton/pom.xml b/multiton/pom.xml
index 990670792..cc5103e74 100644
--- a/multiton/pom.xml
+++ b/multiton/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>multiton</artifactId>
   <dependencies>
diff --git a/mute-idiom/pom.xml b/mute-idiom/pom.xml
index 18d08e822..ec2935e3c 100644
--- a/mute-idiom/pom.xml
+++ b/mute-idiom/pom.xml
@@ -21,7 +21,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>mute-idiom</artifactId>
 	<dependencies>
diff --git a/mutex/pom.xml b/mutex/pom.xml
index 3de74fd6d..84a8f58b6 100644
--- a/mutex/pom.xml
+++ b/mutex/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>mutex</artifactId>
   <dependencies>
diff --git a/naked-objects/dom/pom.xml b/naked-objects/dom/pom.xml
index 23354d338..9be69d7b2 100644
--- a/naked-objects/dom/pom.xml
+++ b/naked-objects/dom/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-dom</artifactId>
diff --git a/naked-objects/fixture/pom.xml b/naked-objects/fixture/pom.xml
index 2e78e9c52..ff15d19d8 100644
--- a/naked-objects/fixture/pom.xml
+++ b/naked-objects/fixture/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-fixture</artifactId>
diff --git a/naked-objects/integtests/pom.xml b/naked-objects/integtests/pom.xml
index 100c10465..20cb9868d 100644
--- a/naked-objects/integtests/pom.xml
+++ b/naked-objects/integtests/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-integtests</artifactId>
diff --git a/naked-objects/pom.xml b/naked-objects/pom.xml
index 16b993a12..1672bd579 100644
--- a/naked-objects/pom.xml
+++ b/naked-objects/pom.xml
@@ -15,7 +15,7 @@
 	<parent>
 		<artifactId>java-design-patterns</artifactId>
 		<groupId>com.iluwatar</groupId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects</artifactId>
@@ -350,17 +350,17 @@
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-dom</artifactId>
-				<version>1.19.0</version>
+				<version>1.20.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-fixture</artifactId>
-				<version>1.19.0</version>
+				<version>1.20.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-webapp</artifactId>
-				<version>1.19.0</version>
+				<version>1.20.0-SNAPSHOT</version>
 			</dependency>
 
 		</dependencies>
diff --git a/naked-objects/webapp/pom.xml b/naked-objects/webapp/pom.xml
index 7a9ab9205..6bc7184b9 100644
--- a/naked-objects/webapp/pom.xml
+++ b/naked-objects/webapp/pom.xml
@@ -16,7 +16,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>naked-objects</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-webapp</artifactId>
diff --git a/null-object/pom.xml b/null-object/pom.xml
index 49e2d5855..b471b86d4 100644
--- a/null-object/pom.xml
+++ b/null-object/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>null-object</artifactId>
   <dependencies>
diff --git a/object-mother/pom.xml b/object-mother/pom.xml
index e9d0c8205..d59799e0c 100644
--- a/object-mother/pom.xml
+++ b/object-mother/pom.xml
@@ -30,7 +30,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <artifactId>object-mother</artifactId>
     <dependencies>
diff --git a/object-pool/pom.xml b/object-pool/pom.xml
index 3ef4e7dd5..75fa63163 100644
--- a/object-pool/pom.xml
+++ b/object-pool/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>object-pool</artifactId>
   <dependencies>
diff --git a/observer/pom.xml b/observer/pom.xml
index 5c154e243..3843c60c8 100644
--- a/observer/pom.xml
+++ b/observer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>observer</artifactId>
   <dependencies>
diff --git a/page-object/pom.xml b/page-object/pom.xml
index ece7a936c..f14050849 100644
--- a/page-object/pom.xml
+++ b/page-object/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <artifactId>page-object</artifactId>
     <dependencies>
diff --git a/partial-response/pom.xml b/partial-response/pom.xml
index b52316c6e..afe04012b 100644
--- a/partial-response/pom.xml
+++ b/partial-response/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/poison-pill/pom.xml b/poison-pill/pom.xml
index e4d11baa2..2ae5c7b31 100644
--- a/poison-pill/pom.xml
+++ b/poison-pill/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>poison-pill</artifactId>
   <dependencies>
diff --git a/pom.xml b/pom.xml
index 3e16fa21e..115aefc32 100644
--- a/pom.xml
+++ b/pom.xml
@@ -21,7 +21,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
     <packaging>pom</packaging>
     <inceptionYear>2014</inceptionYear>
     <properties>
diff --git a/private-class-data/pom.xml b/private-class-data/pom.xml
index 09539cda0..570b01935 100644
--- a/private-class-data/pom.xml
+++ b/private-class-data/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>private-class-data</artifactId>
   <dependencies>
diff --git a/producer-consumer/pom.xml b/producer-consumer/pom.xml
index ff17ffad7..9ef208f99 100644
--- a/producer-consumer/pom.xml
+++ b/producer-consumer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   <artifactId>producer-consumer</artifactId>
   <dependencies>
diff --git a/promise/pom.xml b/promise/pom.xml
index c3f5386f1..4ae5566b2 100644
--- a/promise/pom.xml
+++ b/promise/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>promise</artifactId>
   <dependencies>
diff --git a/property/pom.xml b/property/pom.xml
index c96d56dda..d07153e32 100644
--- a/property/pom.xml
+++ b/property/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>property</artifactId>
   <dependencies>
diff --git a/prototype/pom.xml b/prototype/pom.xml
index fe434a5ba..9674eabb0 100644
--- a/prototype/pom.xml
+++ b/prototype/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
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   </parent>
   <artifactId>prototype</artifactId>
   <dependencies>
diff --git a/proxy/pom.xml b/proxy/pom.xml
index 3e7b78bcc..600285dd1 100644
--- a/proxy/pom.xml
+++ b/proxy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>proxy</artifactId>
   <dependencies>
diff --git a/publish-subscribe/pom.xml b/publish-subscribe/pom.xml
index 2e928401a..6edc98dbf 100644
--- a/publish-subscribe/pom.xml
+++ b/publish-subscribe/pom.xml
@@ -28,7 +28,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>publish-subscribe</artifactId>
 	<dependencies>
diff --git a/queue-load-leveling/pom.xml b/queue-load-leveling/pom.xml
index dc52a2586..11d178dca 100644
--- a/queue-load-leveling/pom.xml
+++ b/queue-load-leveling/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>queue-load-leveling</artifactId>
   <dependencies>
diff --git a/reactor/pom.xml b/reactor/pom.xml
index 18d8ab378..f05edc244 100644
--- a/reactor/pom.xml
+++ b/reactor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>reactor</artifactId>
   <dependencies>
diff --git a/reader-writer-lock/pom.xml b/reader-writer-lock/pom.xml
index 34be6bc0d..4114c88d3 100644
--- a/reader-writer-lock/pom.xml
+++ b/reader-writer-lock/pom.xml
@@ -30,7 +30,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <artifactId>reader-writer-lock</artifactId>
     <dependencies>
diff --git a/repository/pom.xml b/repository/pom.xml
index 341ffe605..02761f524 100644
--- a/repository/pom.xml
+++ b/repository/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <artifactId>repository</artifactId>
     <dependencies>
diff --git a/resource-acquisition-is-initialization/pom.xml b/resource-acquisition-is-initialization/pom.xml
index 5ad223e85..c69db9500 100644
--- a/resource-acquisition-is-initialization/pom.xml
+++ b/resource-acquisition-is-initialization/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>resource-acquisition-is-initialization</artifactId>
   <dependencies>
diff --git a/retry/pom.xml b/retry/pom.xml
index a79da285c..9999e0c3b 100644
--- a/retry/pom.xml
+++ b/retry/pom.xml
@@ -26,7 +26,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <artifactId>retry</artifactId>
     <packaging>jar</packaging>
diff --git a/semaphore/pom.xml b/semaphore/pom.xml
index 4d86fec77..fc4a6e362 100644
--- a/semaphore/pom.xml
+++ b/semaphore/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>semaphore</artifactId>
   <dependencies>
diff --git a/servant/pom.xml b/servant/pom.xml
index 5632b1188..d72fde86f 100644
--- a/servant/pom.xml
+++ b/servant/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>servant</artifactId>
   <dependencies>
diff --git a/service-layer/pom.xml b/service-layer/pom.xml
index 3a04b608e..940629be5 100644
--- a/service-layer/pom.xml
+++ b/service-layer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-layer</artifactId>
   <dependencies>
diff --git a/service-locator/pom.xml b/service-locator/pom.xml
index 2656e06ad..f78436585 100644
--- a/service-locator/pom.xml
+++ b/service-locator/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-locator</artifactId>
   <dependencies>
diff --git a/singleton/pom.xml b/singleton/pom.xml
index a8a363d9d..2f8a55265 100644
--- a/singleton/pom.xml
+++ b/singleton/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>singleton</artifactId>
   <dependencies>
diff --git a/specification/pom.xml b/specification/pom.xml
index 4e11ebefa..ddd9ebde4 100644
--- a/specification/pom.xml
+++ b/specification/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>specification</artifactId>
   <dependencies>
diff --git a/state/pom.xml b/state/pom.xml
index 0dff4fe87..fee910c55 100644
--- a/state/pom.xml
+++ b/state/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>state</artifactId>
   <dependencies>
diff --git a/step-builder/pom.xml b/step-builder/pom.xml
index 796e1b5ab..0a5d1a560 100644
--- a/step-builder/pom.xml
+++ b/step-builder/pom.xml
@@ -30,7 +30,7 @@
   <parent>
     <artifactId>java-design-patterns</artifactId>
     <groupId>com.iluwatar</groupId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>step-builder</artifactId>
   <dependencies>
diff --git a/strategy/pom.xml b/strategy/pom.xml
index a6266025a..1ca63da0b 100644
--- a/strategy/pom.xml
+++ b/strategy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>strategy</artifactId>
   <dependencies>
diff --git a/template-method/pom.xml b/template-method/pom.xml
index 23b0724c1..4d0703858 100644
--- a/template-method/pom.xml
+++ b/template-method/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>template-method</artifactId>
   <dependencies>
diff --git a/thread-pool/pom.xml b/thread-pool/pom.xml
index 7b4dc6349..517651596 100644
--- a/thread-pool/pom.xml
+++ b/thread-pool/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>thread-pool</artifactId>
   <dependencies>
diff --git a/throttling/pom.xml b/throttling/pom.xml
index d52ec9a5b..1d7677c37 100644
--- a/throttling/pom.xml
+++ b/throttling/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/tls/pom.xml b/tls/pom.xml
index 086a00820..291527967 100644
--- a/tls/pom.xml
+++ b/tls/pom.xml
@@ -30,7 +30,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>tls</artifactId>
   <dependencies>
diff --git a/tolerant-reader/pom.xml b/tolerant-reader/pom.xml
index 90d4b2069..adbb4d48e 100644
--- a/tolerant-reader/pom.xml
+++ b/tolerant-reader/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>tolerant-reader</artifactId>
   <dependencies>
diff --git a/trampoline/pom.xml b/trampoline/pom.xml
index 8ab5a2374..e5d4c25c9 100644
--- a/trampoline/pom.xml
+++ b/trampoline/pom.xml
@@ -30,7 +30,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
 
     </parent>
     <artifactId>trampoline</artifactId>
diff --git a/twin/pom.xml b/twin/pom.xml
index 490e24cb2..bc9d976aa 100644
--- a/twin/pom.xml
+++ b/twin/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>twin</artifactId>
   <dependencies>
diff --git a/unit-of-work/pom.xml b/unit-of-work/pom.xml
index 420a2918c..cd6f10a0c 100644
--- a/unit-of-work/pom.xml
+++ b/unit-of-work/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <artifactId>java-design-patterns</artifactId>
         <groupId>com.iluwatar</groupId>
-        <version>1.19.0</version>
+        <version>1.20.0-SNAPSHOT</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
 
diff --git a/value-object/pom.xml b/value-object/pom.xml
index 2b09c0bf2..99ca02195 100644
--- a/value-object/pom.xml
+++ b/value-object/pom.xml
@@ -30,7 +30,7 @@
 	<parent>
 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
-		<version>1.19.0</version>
+		<version>1.20.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>value-object</artifactId>
 	<dependencies>
diff --git a/visitor/pom.xml b/visitor/pom.xml
index 8c8e67a08..73c8457ec 100644
--- a/visitor/pom.xml
+++ b/visitor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.19.0</version>
+    <version>1.20.0-SNAPSHOT</version>
   </parent>
   <artifactId>visitor</artifactId>
   <dependencies>