diff --git a/build-aux/chat.revolt.Mutiny.Devel.json b/build-aux/chat.revolt.Mutiny.Devel.json
index 376b120..b02e963 100644
--- a/build-aux/chat.revolt.Mutiny.Devel.json
+++ b/build-aux/chat.revolt.Mutiny.Devel.json
@@ -1,7 +1,7 @@
 {
     "app-id": "chat.revolt.Mutiny.Devel",
     "runtime": "org.gnome.Platform",
-    "runtime-version": "master",
+    "runtime-version": "42",
     "sdk": "org.gnome.Sdk",
     "sdk-extensions": [
         "org.freedesktop.Sdk.Extension.rust-stable"