diff --git a/Dockerfile b/Dockerfile
index 2084581..541d54b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:buster-slim
 
-ARG RUST_VER=1.64.0
+ARG RUST_VER=1.56.1
 
 RUN apt update -y -q \
  && apt upgrade -y -q \
@@ -64,6 +64,7 @@ RUN rustup default $RUST_VER
 RUN rustup target add x86_64-pc-windows-gnu
 RUN rustup target add x86_64-apple-darwin
 RUN rustup component add clippy
+RUN cargo install cargo-outdated
 RUN cargo install cargo-audit
 RUN cargo install cargo-web
 RUN cargo install wasm-pack