diff --git a/build-aux/flatpak/com.github.GradienceTeam.Gradience.Devel.json b/build-aux/flatpak/com.github.GradienceTeam.Gradience.Devel.json
index 086ff085..f6841977 100644
--- a/build-aux/flatpak/com.github.GradienceTeam.Gradience.Devel.json
+++ b/build-aux/flatpak/com.github.GradienceTeam.Gradience.Devel.json
@@ -1,7 +1,7 @@
 {
     "app-id" : "com.github.GradienceTeam.Gradience.Devel",
     "runtime" : "org.gnome.Platform",
-    "runtime-version" : "master",
+    "runtime-version" : "43",
     "sdk" : "org.gnome.Sdk",
     "command" : "gradience",
     "finish-args" : [