diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 70ded17aa5..61c33397f4 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -17,13 +17,14 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        version: ["16.04", "18.04", "20.04"]
+        version: ["16.04", "18.04", "20.04", "22.04"]
     steps:
       - name: Checkout
         uses: actions/checkout@main
         with:
           fetch-depth: 0
           persist-credentials: false
+
       - name: Fetch origin/master from Git
         run: git fetch origin master
 
diff --git a/Dockerfile b/Dockerfile
index 9c14792f9c..9c20b42125 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ARG DEBIAN_FRONTEND=noninteractive
 
 # hadolint ignore=DL3008
 RUN apt-get update \
-  && apt-get install -y --no-install-recommends software-properties-common \
+  && apt-get install -y --no-install-recommends software-properties-common gnupg-agent \
   && add-apt-repository -y ppa:git-core/ppa \
   && apt-get update \
   && apt-get install -y --no-install-recommends \
@@ -27,6 +27,8 @@ RUN apt-get update \
     sudo \
     uuid-runtime \
     tzdata \
+  && apt remove --purge -y software-properties-common \
+  && apt autoremove --purge -y \
   && rm -rf /var/lib/apt/lists/* \
   && localedef -i en_US -f UTF-8 en_US.UTF-8 \
   && useradd -m -s /bin/bash linuxbrew \