diff --git a/.github/workflows/base-glibc-busybox-bash.yaml b/.github/workflows/base-glibc-busybox-bash.yaml
index 1e700832..f32b5163 100644
--- a/.github/workflows/base-glibc-busybox-bash.yaml
+++ b/.github/workflows/base-glibc-busybox-bash.yaml
@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     name: Build & Push
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     env:
       # The base image is not intended to change often and should be used with
       # version tags or checksum IDs, but not via "latest".
diff --git a/.github/workflows/base-glibc-debian-bash.yaml b/.github/workflows/base-glibc-debian-bash.yaml
index de1bbbe4..9c37d290 100644
--- a/.github/workflows/base-glibc-debian-bash.yaml
+++ b/.github/workflows/base-glibc-debian-bash.yaml
@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     name: Build & Push
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     env:
       # The base image is not intended to change often and should be used with
       # version tags or checksum IDs, but not via "latest".
diff --git a/.github/workflows/create-env.yaml b/.github/workflows/create-env.yaml
index 988b40ef..f53adde2 100644
--- a/.github/workflows/create-env.yaml
+++ b/.github/workflows/create-env.yaml
@@ -14,7 +14,7 @@ on:
 jobs:
   build:
     name: Build & Push
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     env:
       IMAGE_VERSION: '1.2.0'
       VERSION: '4.9.2'