diff --git a/Documentation/Administration/Changelog/v/5-1-0.rst b/Documentation/Administration/Changelog/v/5-1-0.rst
index 8d76c13c..049f6759 100644
--- a/Documentation/Administration/Changelog/v/5-1-0.rst
+++ b/Documentation/Administration/Changelog/v/5-1-0.rst
@@ -1,4 +1,4 @@
-5.2.0 - 2020-02-10
+5.1.0 - 2020-02-10
 ==================
 
 .. include:: ../../../Includes.txt
diff --git a/ext_emconf.php b/ext_emconf.php
index 27a06677..72cbec72 100755
--- a/ext_emconf.php
+++ b/ext_emconf.php
@@ -8,7 +8,7 @@
     'clearCacheOnLoad' => true,
     'author' => 'tt_address Development Team',
     'author_email' => 'friendsof@typo3.org',
-    'version' => '5.2.0',
+    'version' => '5.1.0',
     'constraints' => [
         'depends' => [
             'typo3' => '9.5.9-10.4.99',