diff --git a/com.mattjakeman.ExtensionManager.Devel.json b/com.mattjakeman.ExtensionManager.Devel.json
index 673f75f9..8bc4ac71 100644
--- a/com.mattjakeman.ExtensionManager.Devel.json
+++ b/com.mattjakeman.ExtensionManager.Devel.json
@@ -1,7 +1,7 @@
 {
     "app-id" : "com.mattjakeman.ExtensionManager.Devel",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "master",
+    "runtime-version" : "43",
     "sdk" : "org.gnome.Sdk",
     "command" : "extension-manager",
     "finish-args" : [