diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index 6da32a9..9ebfa82 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -40,6 +40,8 @@ jobs:
         with:
           context: .
           push: true
+          build-args: |
+            REACT_APP_VERSION=${{ steps.docker_tag.outputs.tag == 'main' && 'stable' || 'nightly' }}
           tags: |
             ${{ env.IMAGE_NAME }}:latest
             ${{ env.IMAGE_NAME }}:${{ github.sha }}
diff --git a/Dockerfile b/Dockerfile
index 3d11cbe..8ecf4e8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,6 +6,9 @@ WORKDIR /app/web
 COPY web/package*.json ./
 RUN npm install --no-audit --no-fund
 COPY web/ .
+# Umgebungsvariable für React Build verfügbar machen
+ARG REACT_APP_VERSION=stable
+ENV REACT_APP_VERSION=$REACT_APP_VERSION
 RUN npm run build
 
 # --- Build server (npm) ---