diff --git a/Dockerfile b/Dockerfile
index e7f75e6..fdde5d9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:buster-slim
 
-ARG RUST_VER=1.39.0
+ARG RUST_VER=1.40.0
 
 RUN apt update -y -q \
  && apt upgrade -y -q \