diff --git a/src/BackOffice/Dockerfile b/src/BackOffice/Dockerfile
index a89ba28..2b8bac4 100644
--- a/src/BackOffice/Dockerfile
+++ b/src/BackOffice/Dockerfile
@@ -31,6 +31,8 @@ RUN chmod +x /docker-entrypoint.sh
 
 # Default Blazor environment (override via K8s env var BLAZOR_ENVIRONMENT)
 ENV BLAZOR_ENVIRONMENT=Staging
+# Default gateway URL for gRPC calls (injected into appsettings at startup)
+ENV GW_URL=https://cms.se.kbs1.ir
 
 EXPOSE 80
 CMD ["/docker-entrypoint.sh"]
diff --git a/src/BackOffice/docker-entrypoint.sh b/src/BackOffice/docker-entrypoint.sh
index b0ceecd..2cf6f93 100644
--- a/src/BackOffice/docker-entrypoint.sh
+++ b/src/BackOffice/docker-entrypoint.sh
@@ -15,4 +15,16 @@ server {
 }
 NGINX_CONF
 
+# Inject GW_URL into all appsettings JSON files
+# This overrides GwUrl regardless of which environment Blazor detects,
+# which is critical because the service worker cache strips the
+# blazor-environment header and Blazor falls back to Production.
+WWWROOT="/usr/share/nginx/html"
+if [ -n "$GW_URL" ]; then
+  echo "[entrypoint] Setting GwUrl to $GW_URL in all appsettings files"
+  for f in "$WWWROOT"/appsettings*.json; do
+    [ -f "$f" ] && sed -i "s|\"GwUrl\":\s*\"[^\"]*\"|\"GwUrl\": \"$GW_URL\"|g" "$f"
+  done
+fi
+
 exec nginx -g 'daemon off;'