diff --git a/pontos/version/schemes/_pep440.py b/pontos/version/schemes/_pep440.py
index 5b41fc65f..aecfc5608 100644
--- a/pontos/version/schemes/_pep440.py
+++ b/pontos/version/schemes/_pep440.py
@@ -206,7 +206,7 @@ def next_dev_version(cls, current_version: Version) -> Version:
         return cls.version_from_string(
             f"{current_version.major}."
             f"{current_version.minor}."
-            f"{current_version.micro + 1 }.dev1"
+            f"{current_version.patch + 1}.dev1"
         )
 
     @classmethod