diff --git a/.github/workflows/master.yaml b/.github/workflows/master.yaml
index 50d5275..6261a12 100644
--- a/.github/workflows/master.yaml
+++ b/.github/workflows/master.yaml
@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [debian, ubuntu]
+        os: [ubuntu]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2
diff --git a/.github/workflows/pull_request.yaml b/.github/workflows/pull_request.yaml
index 76152b8..5997fe9 100644
--- a/.github/workflows/pull_request.yaml
+++ b/.github/workflows/pull_request.yaml
@@ -9,7 +9,7 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [debian, ubuntu]
+        os: [ubuntu]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2