diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6f154d41..eedf0d63 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased] - yyyy-mm-dd
 
-## [5.1.0] - 2020-mm-dd
+## [5.1.0] - 2020-08-29
 - Allow symfony/* ~3.4 versions
 - Support `--ignore-parse-errors` to have an exit code 0.
 - Add more PHP typehints on the code-base.
diff --git a/src/Doctum.php b/src/Doctum.php
index bf42f6d4..bd7839d8 100644
--- a/src/Doctum.php
+++ b/src/Doctum.php
@@ -42,7 +42,7 @@ class Doctum extends Container
     public const VERSION_MAJOR = 5;
     public const VERSION_MINOR = 1;
     public const VERSION_PATCH = 0;
-    public const IS_DEV = true;
+    public const IS_DEV = false;
 
     //@phpstan-ignore-next-line
     public const VERSION = self::VERSION_MAJOR . '.' . self::VERSION_MINOR . '.' . self::VERSION_PATCH . (self::IS_DEV ? '-dev' : '');