diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 0ca12bb..80c18bc 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -51,7 +51,7 @@ jobs:
       #     path: build/obs-virtualbg-*.zip
   build_linux:
     name: build on Linux
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: checkout
         uses: actions/checkout@v2
diff --git a/.github/workflows/upload-release.yml b/.github/workflows/upload-release.yml
index e229cfd..f6c3592 100644
--- a/.github/workflows/upload-release.yml
+++ b/.github/workflows/upload-release.yml
@@ -70,7 +70,7 @@ jobs:
   #       file_glob: true
   release_ubuntu:
     name: Upload Release Asset on Ubuntu
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: checkout
         uses: actions/checkout@v2