diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1e80f7fb..1b7659f0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@ jobs:
   linux-gl:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:jammy
+      image: ubuntu:focal
       env: { LANG: "C.UTF-8" }
     steps:
       - uses: actions/checkout@v3
@@ -41,7 +41,7 @@ jobs:
   linux-gles:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:jammy
+      image: ubuntu:focal
       env: { LANG: "C.UTF-8" }
     steps:
       - uses: actions/checkout@v3
@@ -68,7 +68,7 @@ jobs:
   linux-sdl:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:jammy
+      image: ubuntu:focal
       env: { LANG: "C.UTF-8" }
     steps:
       - uses: actions/checkout@v3
@@ -90,7 +90,7 @@ jobs:
   linux-sdl-gl3:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:jammy
+      image: ubuntu:focal
       env: { LANG: "C.UTF-8" }
     steps:
       - uses: actions/checkout@v3
@@ -117,7 +117,7 @@ jobs:
   linux-sdl-gles2:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:jammy
+      image: ubuntu:focal
       env: { LANG: "C.UTF-8" }
     steps:
       - uses: actions/checkout@v3