diff --git a/composer.json b/composer.json
index 2ee5d25b..488d91d5 100644
--- a/composer.json
+++ b/composer.json
@@ -36,7 +36,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "1.8.x-dev"
+            "dev-master": "1.9.x-dev"
         }
     }
 }
diff --git a/lib/Doctrine/Common/Cache/Version.php b/lib/Doctrine/Common/Cache/Version.php
index dbf55f42..834b5b7d 100644
--- a/lib/Doctrine/Common/Cache/Version.php
+++ b/lib/Doctrine/Common/Cache/Version.php
@@ -4,5 +4,5 @@
 
 class Version
 {
-    public const VERSION = '1.8.0';
+    public const VERSION = '1.9.0-DEV';
 }