diff --git a/.github/workflows/test-and-build.yaml b/.github/workflows/test-and-build.yaml
index 24e7e7b..ebe1acb 100644
--- a/.github/workflows/test-and-build.yaml
+++ b/.github/workflows/test-and-build.yaml
@@ -21,7 +21,7 @@ jobs:
       fail-fast: false
       matrix:
         ARCH: [amd64, armhf, arm64]
-        DEBIAN_VERSION: [stretch, buster]
+        DEBIAN_VERSION: [stretch, buster, bullseye]
     env:
       ARCH: ${{matrix.ARCH}}
       DEBIAN_VERSION: ${{matrix.DEBIAN_VERSION}}
diff --git a/Dockerfile.py b/Dockerfile.py
index 44efac4..30c5f20 100755
--- a/Dockerfile.py
+++ b/Dockerfile.py
@@ -10,7 +10,7 @@ Options:
     --fail-fast          Exit on first build error
     --hub_tag=<tag>      What the Docker Hub Image should be tagged as [default: None]
     --arch=<arch>        What Architecture(s) to build     [default: amd64 armel armhf arm64]
-    --debian=<version>   What debian version(s) to build   [default: stretch buster]
+    --debian=<version>   What debian version(s) to build   [default: stretch buster bullseye]
     -v                   Print docker's command output     [default: False]
     -t                   Print docker's build time         [default: False]