diff --git a/setup.py b/setup.py
index 928596ff8..f5f07b954 100644
--- a/setup.py
+++ b/setup.py
@@ -21,7 +21,7 @@ def get_version():
     """Gets the pettingzoo version."""
     path = "gymnasium/version.py"
     with open(path) as file:
-        lines = file.readlines()
+        full_version = file.read()
         assert (
             re.match(r'VERSION = "\d\.\d+\.\d+"\n', full_version).group(0) == full_version
         ), f"Unexpected version: {full_version}"