diff --git a/org.zdoom.GZDoom.yaml b/org.zdoom.GZDoom.yaml
index 82f61a7..6532666 100644
--- a/org.zdoom.GZDoom.yaml
+++ b/org.zdoom.GZDoom.yaml
@@ -1,7 +1,7 @@
 app-id: org.zdoom.GZDoom
 runtime: org.freedesktop.Platform
 sdk: org.freedesktop.Sdk
-runtime-version: "20.08"
+runtime-version: "21.08"
 command: gzdoom.sh
 
 finish-args: