diff --git a/abstract-factory/pom.xml b/abstract-factory/pom.xml
index 7971a6e4c..734020720 100644
--- a/abstract-factory/pom.xml
+++ b/abstract-factory/pom.xml
@@ -29,7 +29,7 @@
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     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
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   <artifactId>abstract-factory</artifactId>
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diff --git a/adapter/pom.xml b/adapter/pom.xml
index 31a9a6671..476eb4dce 100644
--- a/adapter/pom.xml
+++ b/adapter/pom.xml
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   <artifactId>adapter</artifactId>
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diff --git a/async-method-invocation/pom.xml b/async-method-invocation/pom.xml
index 236a5e73a..292eb136b 100644
--- a/async-method-invocation/pom.xml
+++ b/async-method-invocation/pom.xml
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     <groupId>com.iluwatar</groupId>
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diff --git a/bridge/pom.xml b/bridge/pom.xml
index e50c166b2..6ac261286 100644
--- a/bridge/pom.xml
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diff --git a/builder/pom.xml b/builder/pom.xml
index 8b01a68aa..7d83f6c28 100644
--- a/builder/pom.xml
+++ b/builder/pom.xml
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diff --git a/business-delegate/pom.xml b/business-delegate/pom.xml
index 70f2e5b1c..3834b4c8f 100644
--- a/business-delegate/pom.xml
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@@ -30,7 +30,7 @@
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 		<groupId>com.iluwatar</groupId>
 		<artifactId>java-design-patterns</artifactId>
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 	<artifactId>business-delegate</artifactId>
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diff --git a/caching/pom.xml b/caching/pom.xml
index 74cda701a..7b1b22354 100644
--- a/caching/pom.xml
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diff --git a/callback/pom.xml b/callback/pom.xml
index d4c035bbd..8615c4653 100644
--- a/callback/pom.xml
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diff --git a/chain/pom.xml b/chain/pom.xml
index 96fba0795..a1cbffcb2 100644
--- a/chain/pom.xml
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diff --git a/command/pom.xml b/command/pom.xml
index d4f8e5910..bb5cd78ff 100644
--- a/command/pom.xml
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diff --git a/composite/pom.xml b/composite/pom.xml
index bf12366b1..6513a104e 100644
--- a/composite/pom.xml
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diff --git a/dao/pom.xml b/dao/pom.xml
index f5ddf4943..26c35abb0 100644
--- a/dao/pom.xml
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diff --git a/decorator/pom.xml b/decorator/pom.xml
index ba77f55ae..58f2bb0ba 100644
--- a/decorator/pom.xml
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diff --git a/delegation/pom.xml b/delegation/pom.xml
index dc7676d33..33592dd82 100644
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diff --git a/dependency-injection/pom.xml b/dependency-injection/pom.xml
index 4e5c562fd..d8be9fcff 100644
--- a/dependency-injection/pom.xml
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diff --git a/double-checked-locking/pom.xml b/double-checked-locking/pom.xml
index 98f5311d6..f8ac5fa2e 100644
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diff --git a/double-dispatch/pom.xml b/double-dispatch/pom.xml
index 9f5f6044c..8896abd9f 100644
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diff --git a/event-aggregator/pom.xml b/event-aggregator/pom.xml
index 2488ccb68..1b1f289b2 100644
--- a/event-aggregator/pom.xml
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diff --git a/event-driven-architecture/pom.xml b/event-driven-architecture/pom.xml
index ad0642b5f..cccf39088 100644
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diff --git a/execute-around/pom.xml b/execute-around/pom.xml
index 2b2bfb242..23a0a4a15 100644
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diff --git a/facade/pom.xml b/facade/pom.xml
index 8d9dcfc8a..a526243a1 100644
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diff --git a/factory-kit/pom.xml b/factory-kit/pom.xml
index 26d53871c..ea2aa5976 100644
--- a/factory-kit/pom.xml
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diff --git a/factory-method/pom.xml b/factory-method/pom.xml
index 84f9484c8..7e1cfd28f 100644
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diff --git a/feature-toggle/pom.xml b/feature-toggle/pom.xml
index e86c54b24..cf479dd0a 100644
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diff --git a/fluentinterface/pom.xml b/fluentinterface/pom.xml
index 6c9910d4c..2e4129b2d 100644
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diff --git a/flux/pom.xml b/flux/pom.xml
index 07e0bb6a7..bd454ca23 100644
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diff --git a/flyweight/pom.xml b/flyweight/pom.xml
index e4c5fe5b5..a4221d762 100644
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diff --git a/front-controller/pom.xml b/front-controller/pom.xml
index 0b3e12bf6..c8f136ca8 100644
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diff --git a/half-sync-half-async/pom.xml b/half-sync-half-async/pom.xml
index 7017b5454..5b6ce56b1 100644
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diff --git a/intercepting-filter/pom.xml b/intercepting-filter/pom.xml
index 92c814c43..6ef1e25bc 100644
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diff --git a/interpreter/pom.xml b/interpreter/pom.xml
index 8b6054442..a0003672a 100644
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diff --git a/iterator/pom.xml b/iterator/pom.xml
index d3bce401d..dcd70f809 100644
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diff --git a/layers/pom.xml b/layers/pom.xml
index 647862ad2..abd888afa 100644
--- a/layers/pom.xml
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 		<groupId>com.iluwatar</groupId>
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 	<groupId>com.iluwatar.layers</groupId>
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diff --git a/lazy-loading/pom.xml b/lazy-loading/pom.xml
index e3ce27de0..37b321aec 100644
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diff --git a/mediator/pom.xml b/mediator/pom.xml
index d310c5ef5..7f3209479 100644
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diff --git a/memento/pom.xml b/memento/pom.xml
index 6ef97c893..b7355784c 100644
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diff --git a/message-channel/pom.xml b/message-channel/pom.xml
index 69ddc3fda..3afc5b32e 100644
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diff --git a/model-view-controller/pom.xml b/model-view-controller/pom.xml
index c5e732382..0ae6a6fc6 100644
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diff --git a/model-view-presenter/pom.xml b/model-view-presenter/pom.xml
index 74cbef728..e0a3c57fb 100644
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diff --git a/monad/pom.xml b/monad/pom.xml
index 8d9381225..b737e2174 100644
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diff --git a/monostate/pom.xml b/monostate/pom.xml
index 3c5882bac..bb246d38c 100644
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diff --git a/multiton/pom.xml b/multiton/pom.xml
index f142183a7..2482c056b 100644
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diff --git a/mute-idiom/pom.xml b/mute-idiom/pom.xml
index adf9c5e5a..3bfc3bf8a 100644
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diff --git a/naked-objects/dom/pom.xml b/naked-objects/dom/pom.xml
index 2b456a2bf..be96b2456 100644
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diff --git a/naked-objects/fixture/pom.xml b/naked-objects/fixture/pom.xml
index 467b55a81..6bbaaaeb1 100644
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 	<artifactId>naked-objects-fixture</artifactId>
diff --git a/naked-objects/integtests/pom.xml b/naked-objects/integtests/pom.xml
index 3891467f7..68cac3790 100644
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+		<version>1.12.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-integtests</artifactId>
diff --git a/naked-objects/pom.xml b/naked-objects/pom.xml
index 6c72b74a3..d34dba9a3 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>1.11.0</version>
+		<version>1.12.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects</artifactId>
@@ -350,17 +350,17 @@
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-dom</artifactId>
-				<version>1.11.0</version>
+				<version>1.12.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-fixture</artifactId>
-				<version>1.11.0</version>
+				<version>1.12.0-SNAPSHOT</version>
 			</dependency>
 			<dependency>
 				<groupId>${project.groupId}</groupId>
 				<artifactId>naked-objects-webapp</artifactId>
-				<version>1.11.0</version>
+				<version>1.12.0-SNAPSHOT</version>
 			</dependency>
 
 		</dependencies>
diff --git a/naked-objects/webapp/pom.xml b/naked-objects/webapp/pom.xml
index 41b4906a0..aa7d60438 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>1.11.0</version>
+		<version>1.12.0-SNAPSHOT</version>
 	</parent>
 
 	<artifactId>naked-objects-webapp</artifactId>
diff --git a/null-object/pom.xml b/null-object/pom.xml
index 7e058f0ef..b765c6537 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>null-object</artifactId>
   <dependencies>
diff --git a/object-pool/pom.xml b/object-pool/pom.xml
index 078762d58..6022ef8a7 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>object-pool</artifactId>
   <dependencies>
diff --git a/observer/pom.xml b/observer/pom.xml
index 4249a6eab..fcc3e88aa 100644
--- a/observer/pom.xml
+++ b/observer/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>observer</artifactId>
   <dependencies>
diff --git a/poison-pill/pom.xml b/poison-pill/pom.xml
index 7bd8423c1..b76578122 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>poison-pill</artifactId>
   <dependencies>
diff --git a/pom.xml b/pom.xml
index bdd7ec6a5..8430bcebe 100644
--- a/pom.xml
+++ b/pom.xml
@@ -29,7 +29,7 @@
 
 	<groupId>com.iluwatar</groupId>
 	<artifactId>java-design-patterns</artifactId>
-	<version>1.11.0</version>
+	<version>1.12.0-SNAPSHOT</version>
 	<packaging>pom</packaging>
 
 	<inceptionYear>2014</inceptionYear>
diff --git a/private-class-data/pom.xml b/private-class-data/pom.xml
index 97ffcebe4..877197664 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>private-class-data</artifactId>
   <dependencies>
diff --git a/producer-consumer/pom.xml b/producer-consumer/pom.xml
index cbf247142..c4ea8f1df 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>producer-consumer</artifactId>
   <dependencies>
diff --git a/property/pom.xml b/property/pom.xml
index 7e4484437..c753261d1 100644
--- a/property/pom.xml
+++ b/property/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>property</artifactId>
   <dependencies>
diff --git a/prototype/pom.xml b/prototype/pom.xml
index 1cc90720f..7fb43402f 100644
--- a/prototype/pom.xml
+++ b/prototype/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>prototype</artifactId>
   <dependencies>
diff --git a/proxy/pom.xml b/proxy/pom.xml
index 8098953ae..9936be34b 100644
--- a/proxy/pom.xml
+++ b/proxy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>proxy</artifactId>
   <dependencies>
diff --git a/publish-subscribe/pom.xml b/publish-subscribe/pom.xml
index f0fdd85da..1ff97ca47 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>1.11.0</version>
+		<version>1.12.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>publish-subscribe</artifactId>
 	<dependencies>
diff --git a/reactor/pom.xml b/reactor/pom.xml
index 50698655a..80a15f9d3 100644
--- a/reactor/pom.xml
+++ b/reactor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>reactor</artifactId>
   <dependencies>
diff --git a/reader-writer-lock/pom.xml b/reader-writer-lock/pom.xml
index 673b56a4d..0391ea291 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>1.11.0</version>
+        <version>1.12.0-SNAPSHOT</version>
     </parent>
     <artifactId>reader-writer-lock</artifactId>
     <dependencies>
diff --git a/repository/pom.xml b/repository/pom.xml
index 2757a1268..b8b81ee05 100644
--- a/repository/pom.xml
+++ b/repository/pom.xml
@@ -29,7 +29,7 @@
     <parent>
         <groupId>com.iluwatar</groupId>
         <artifactId>java-design-patterns</artifactId>
-        <version>1.11.0</version>
+        <version>1.12.0-SNAPSHOT</version>
     </parent>
     <artifactId>repository</artifactId>
     <dependencies>
diff --git a/resource-acquisition-is-initialization/pom.xml b/resource-acquisition-is-initialization/pom.xml
index 8ea82f44d..63971d97c 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>resource-acquisition-is-initialization</artifactId>
   <dependencies>
diff --git a/servant/pom.xml b/servant/pom.xml
index 0f7d5a51f..a102ad348 100644
--- a/servant/pom.xml
+++ b/servant/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>servant</artifactId>
   <dependencies>
diff --git a/service-layer/pom.xml b/service-layer/pom.xml
index 963efb32e..c5e4eb8d9 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-layer</artifactId>
   <dependencies>
diff --git a/service-locator/pom.xml b/service-locator/pom.xml
index d03c3973d..f07dc93f8 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>service-locator</artifactId>
   <dependencies>
diff --git a/singleton/pom.xml b/singleton/pom.xml
index cdbd72b69..8ab7e0686 100644
--- a/singleton/pom.xml
+++ b/singleton/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>singleton</artifactId>
   <dependencies>
diff --git a/specification/pom.xml b/specification/pom.xml
index c43bfe733..c54688919 100644
--- a/specification/pom.xml
+++ b/specification/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>specification</artifactId>
   <dependencies>
diff --git a/state/pom.xml b/state/pom.xml
index 46550ea14..2411eb2a7 100644
--- a/state/pom.xml
+++ b/state/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>state</artifactId>
   <dependencies>
diff --git a/step-builder/pom.xml b/step-builder/pom.xml
index b7427f22b..8d926d118 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>step-builder</artifactId>
   <dependencies>
diff --git a/strategy/pom.xml b/strategy/pom.xml
index 53bb7c513..934ff8775 100644
--- a/strategy/pom.xml
+++ b/strategy/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>strategy</artifactId>
   <dependencies>
diff --git a/template-method/pom.xml b/template-method/pom.xml
index e114773fa..af0b19cb4 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>template-method</artifactId>
   <dependencies>
diff --git a/thread-pool/pom.xml b/thread-pool/pom.xml
index c2b9d58b9..824dcd7af 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>thread-pool</artifactId>
   <dependencies>
diff --git a/tolerant-reader/pom.xml b/tolerant-reader/pom.xml
index efce12725..249788da0 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>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>tolerant-reader</artifactId>
   <dependencies>
diff --git a/twin/pom.xml b/twin/pom.xml
index 6675b673a..010bf37b2 100644
--- a/twin/pom.xml
+++ b/twin/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>twin</artifactId>
   <dependencies>
diff --git a/value-object/pom.xml b/value-object/pom.xml
index ed699b553..66b2342eb 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>1.11.0</version>
+		<version>1.12.0-SNAPSHOT</version>
 	</parent>
 	<artifactId>value-object</artifactId>
 	<dependencies>
diff --git a/visitor/pom.xml b/visitor/pom.xml
index 666578d6b..1b594b179 100644
--- a/visitor/pom.xml
+++ b/visitor/pom.xml
@@ -29,7 +29,7 @@
   <parent>
     <groupId>com.iluwatar</groupId>
     <artifactId>java-design-patterns</artifactId>
-    <version>1.11.0</version>
+    <version>1.12.0-SNAPSHOT</version>
   </parent>
   <artifactId>visitor</artifactId>
   <dependencies>