diff --git a/flatpak/hu.kramo.Cartridges.Devel.json b/flatpak/hu.kramo.Cartridges.Devel.json
index e839c89..78737df 100644
--- a/flatpak/hu.kramo.Cartridges.Devel.json
+++ b/flatpak/hu.kramo.Cartridges.Devel.json
@@ -1,7 +1,7 @@
 {
     "id" : "hu.kramo.Cartridges.Devel",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "master",
+    "runtime-version" : "45",
     "sdk" : "org.gnome.Sdk",
     "command" : "cartridges",
     "finish-args" : [