diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index c8d25f0..4b68008 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
 
     container:
-      image: ghcr.io/elementary/flatpak-platform/runtime:8.1
+      image: ghcr.io/elementary/flatpak-platform/runtime:9
       options: --privileged
 
     steps:
diff --git a/com.github.ryonakano.writer.yml b/com.github.ryonakano.writer.yml
index 4e1348e..ccc63ed 100644
--- a/com.github.ryonakano.writer.yml
+++ b/com.github.ryonakano.writer.yml
@@ -1,6 +1,6 @@
 id: com.github.ryonakano.writer
 runtime: io.elementary.Platform
-runtime-version: '8.1'
+runtime-version: '9'
 sdk: io.elementary.Sdk
 command: com.github.ryonakano.writer
 finish-args: