diff --git a/server-scripts/desec-ip-sync/Dockerfile b/server-scripts/desec-ip-sync/Dockerfile
index e15d592..ae7c9ed 100644
--- a/server-scripts/desec-ip-sync/Dockerfile
+++ b/server-scripts/desec-ip-sync/Dockerfile
@@ -4,7 +4,8 @@ COPY . /desec
 
 WORKDIR /desec/server-scripts/desec-ip-sync/
 
-RUN apt install python3.11-venv -y
+
+RUN apt update && apt install python3.11-venv -y
 
 CMD ["bash", "run.bash"]