diff --git a/.github/workflows/docker-janus.yml b/.github/workflows/docker-janus.yml
index d1ddb8e..01e225a 100644
--- a/.github/workflows/docker-janus.yml
+++ b/.github/workflows/docker-janus.yml
@@ -15,6 +15,9 @@ on:
 permissions:
   contents: read
 
+env:
+  TEST_TAG: strukturag/nextcloud-spreed-signaling:janus-test
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -29,3 +32,9 @@ jobs:
         uses: docker/build-push-action@v4
         with:
           context: docker/janus
+          load: true
+          tags: ${{ env.TEST_TAG }}
+
+      - name: Test Docker image
+        run: |
+          docker run --rm ${{ env.TEST_TAG }} /usr/local/bin/janus --version
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index 6692e78..f4f1d9e 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -9,6 +9,9 @@ on:
 permissions:
   contents: read
 
+env:
+  TEST_TAG: strukturag/nextcloud-spreed-signaling:test
+
 jobs:
   server:
     runs-on: ubuntu-latest
@@ -22,6 +25,18 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
 
+      - name: Build Docker image for testing
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: docker/server/Dockerfile
+          load: true
+          tags: ${{ env.TEST_TAG }}
+
+      - name: Test Docker image
+        run: |
+          docker run --rm ${{ env.TEST_TAG }} /usr/bin/nextcloud-spreed-signaling --version
+
       - name: Build Docker image
         uses: docker/build-push-action@v4
         with:
@@ -41,9 +56,21 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
 
+      - name: Build Docker image for testing
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: docker/proxy/Dockerfile
+          load: true
+          tags: ${{ env.TEST_TAG }}
+
+      - name: Test Docker image
+        run: |
+          docker run --rm ${{ env.TEST_TAG }} /usr/bin/nextcloud-spreed-signaling-proxy --version
+
       - name: Build Docker image
         uses: docker/build-push-action@v4
         with:
           context: .
           file: docker/proxy/Dockerfile
-          platforms: linux/amd64,linux/arm64
\ No newline at end of file
+          platforms: linux/amd64,linux/arm64
diff --git a/docker/proxy/Dockerfile b/docker/proxy/Dockerfile
index d043411..7361de3 100644
--- a/docker/proxy/Dockerfile
+++ b/docker/proxy/Dockerfile
@@ -10,11 +10,13 @@ RUN apt-get -y update && \
     if [ -d "vendor" ]; then GOOS=${TARGETOS} GOARCH=${TARGETARCH} GOPROXY=off make proxy -j$(nproc); else \
     GOOS=${TARGETOS} GOARCH=${TARGETARCH} make proxy -j$(nproc); fi
 
-FROM alpine:3
+FROM debian:bullseye-slim
 
 ENV CONFIG=/config/proxy.conf
-RUN adduser -D spreedbackend && \
-    apk add --no-cache bash ca-certificates libc6-compat libstdc++
+RUN adduser --system --no-create-home spreedbackend && \
+    apt-get update -y && \
+    apt-get install -y ca-certificates && \
+    rm -rf /var/apt/lists/*
 
 COPY --from=builder /workdir/bin/proxy /usr/bin/nextcloud-spreed-signaling-proxy
 COPY ./proxy.conf.in /config/proxy.conf.in
diff --git a/docker/server/Dockerfile b/docker/server/Dockerfile
index be36ca7..ba1538a 100644
--- a/docker/server/Dockerfile
+++ b/docker/server/Dockerfile
@@ -11,11 +11,13 @@ RUN apt-get -y update && \
     if [ -d "vendor" ]; then GOOS=${TARGETOS} GOARCH=${TARGETARCH} GOPROXY=off make server -j$(nproc); else \
     GOOS=${TARGETOS} GOARCH=${TARGETARCH} make server -j$(nproc); fi
 
-FROM alpine:3
+FROM debian:bullseye-slim
 
 ENV CONFIG=/config/server.conf
-RUN adduser -D spreedbackend && \
-    apk add --no-cache bash ca-certificates libc6-compat libstdc++
+RUN adduser --system --no-create-home spreedbackend && \
+    apt-get update -y && \
+    apt-get install -y ca-certificates && \
+    rm -rf /var/apt/lists/*
 
 COPY --from=builder /workdir/bin/signaling /usr/bin/nextcloud-spreed-signaling
 COPY ./server.conf.in /config/server.conf.in