diff --git a/.github/workflows/test_set_2.yml b/.github/workflows/test_set_2.yml
index a0038e3..fdc342b 100644
--- a/.github/workflows/test_set_2.yml
+++ b/.github/workflows/test_set_2.yml
@@ -11,7 +11,7 @@ jobs:
     if: github.repository_owner == 'hwdsl2'
     strategy:
       matrix:
-        os_version: ["debian:12", "debian:11", "debian:10"]
+        os_version: ["debian:12", "debian:11"]
       fail-fast: false
     container:
       image: ${{ matrix.os_version }}
diff --git a/.github/workflows/test_set_3.yml b/.github/workflows/test_set_3.yml
index 3badb1e..ab987fd 100644
--- a/.github/workflows/test_set_3.yml
+++ b/.github/workflows/test_set_3.yml
@@ -10,7 +10,7 @@ jobs:
     if: github.repository_owner == 'hwdsl2'
     strategy:
       matrix:
-        os: [ubuntu-24.04, ubuntu-22.04, ubuntu-20.04]
+        os: [ubuntu-24.04, ubuntu-22.04]
       fail-fast: false
     runs-on: ${{ matrix.os }}
     steps: