diff --git a/.github/workflows/linux-continuous.yml b/.github/workflows/linux-continuous.yml
index 49fb13b6b8..ba857d1d13 100644
--- a/.github/workflows/linux-continuous.yml
+++ b/.github/workflows/linux-continuous.yml
@@ -10,7 +10,7 @@ on:
 jobs:
   build-linux:
     name: build-linux
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v2.0.0
diff --git a/.github/workflows/presubmit.yml b/.github/workflows/presubmit.yml
index d1f993ab57..d411f77ec9 100644
--- a/.github/workflows/presubmit.yml
+++ b/.github/workflows/presubmit.yml
@@ -9,7 +9,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest]
+        os: [macos-latest, ubuntu-18.04]
 
     steps:
       - uses: actions/checkout@v2.0.0
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 91b1f6e3e7..b726d8a85c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -20,7 +20,7 @@ jobs:
 
     strategy:
       matrix:
-        os: [macos-latest, ubuntu-latest]
+        os: [macos-latest, ubuntu-18.04]
 
     steps:
       - name: Decide Git ref