diff --git a/.github/workflows/docker_build_push.yaml b/.github/workflows/docker_build_push.yaml
index 97f3e708df..dc5e20ca1f 100644
--- a/.github/workflows/docker_build_push.yaml
+++ b/.github/workflows/docker_build_push.yaml
@@ -3,7 +3,7 @@ on: [push]
 jobs:
   test:
     name: Build and Push Docker - Source
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
diff --git a/contrib/docker/Dockerfile.minbase b/contrib/docker/Dockerfile.minbase
index b27238ea5e..85ea8a1de8 100644
--- a/contrib/docker/Dockerfile.minbase
+++ b/contrib/docker/Dockerfile.minbase
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:20.04
 ENV TZ=Etc/UTC
 ENV HUBLAB=github
 ENV GITNAME=CoinBlack
diff --git a/contrib/docker/Dockerfile.ubase b/contrib/docker/Dockerfile.ubase
index deaebd6054..308b3d036c 100755
--- a/contrib/docker/Dockerfile.ubase
+++ b/contrib/docker/Dockerfile.ubase
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:20.04
 ENV TZ=Etc/UTC
 ENV HUBLAB=github
 ENV GITNAME=CoinBlack
diff --git a/contrib/docker/Dockerfile.ubuntu b/contrib/docker/Dockerfile.ubuntu
index ed90842292..61b1da1ec9 100755
--- a/contrib/docker/Dockerfile.ubuntu
+++ b/contrib/docker/Dockerfile.ubuntu
@@ -3,7 +3,7 @@ RUN echo "Building Ubuntu Package"
 #
 # Collect dependencies
 #
-FROM ubuntu
+FROM ubuntu:20.04
 ENV TZ=Etc/UTC
 ENV DEBIAN_FRONTEND=noninteractive
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone && \