diff --git a/.github/workflows/test-and-build.yaml b/.github/workflows/test-and-build.yaml
index 19380c9..fd6c5ab 100644
--- a/.github/workflows/test-and-build.yaml
+++ b/.github/workflows/test-and-build.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       ARCH: amd64
-      DEBIAN_VERSION: bullseye
+      DEBIAN_VERSION: buster
     steps:
       - name: Checkout Repo
         uses: actions/checkout@v2
diff --git a/Dockerfile b/Dockerfile
index 5cd5d9c..14fe67e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,5 +1,5 @@
 ARG PIHOLE_BASE
-FROM "${PIHOLE_BASE:-ghcr.io/pi-hole/docker-pi-hole-base:bullseye-slim}"
+FROM "${PIHOLE_BASE:-ghcr.io/pi-hole/docker-pi-hole-base:buster-slim}"
 
 ARG PIHOLE_DOCKER_TAG
 ENV PIHOLE_DOCKER_TAG "${PIHOLE_DOCKER_TAG}"
diff --git a/build.yml b/build.yml
index 812bce5..a316274 100644
--- a/build.yml
+++ b/build.yml
@@ -9,9 +9,9 @@ x-common-args: &common-args
 
 services:
   amd64:
-    image: pihole:${PIHOLE_DOCKER_TAG}-amd64-${DEBIAN_VERSION:-bullseye}
+    image: pihole:${PIHOLE_DOCKER_TAG}-amd64-${DEBIAN_VERSION:-buster}
     build:
       context: .
       args:
         <<: *common-args
-        PIHOLE_BASE: ghcr.io/pi-hole/docker-pi-hole-base:${DEBIAN_VERSION:-bullseye}-slim
\ No newline at end of file
+        PIHOLE_BASE: ghcr.io/pi-hole/docker-pi-hole-base:${DEBIAN_VERSION:-buster}-slim
\ No newline at end of file