diff --git a/Dockerfile b/Dockerfile
index 465ea31..4fde730 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ubuntu
+FROM ubuntu:focal
 WORKDIR /app
 ENV DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install --no-install-recommends -y \