diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f484c5..cf3ccaf 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@ This project follows [semantic versioning](http://semver.org).
 ### Unreleased
 
 - [added] Added service restrictions to systemd
+- [changed] Rust version 1.40.0
 - [changed] Also drop privileges in foreground mode
 - [changed] Set builders to Ubuntu 16.04 and CentOS 7
 - [changed] Set keepalive to 120 secs when NAT is detected
diff --git a/builder/Dockerfile-deb b/builder/Dockerfile-deb
index 90342fd..aa4915f 100644
--- a/builder/Dockerfile-deb
+++ b/builder/Dockerfile-deb
@@ -9,7 +9,7 @@ RUN useradd -ms /bin/bash user
 USER user
 WORKDIR /home/user
 
-ENV RUST=1.39.0
+ENV RUST=1.40.0
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${RUST}
 
diff --git a/builder/Dockerfile-rpm b/builder/Dockerfile-rpm
index b0cb1e4..3947bfa 100644
--- a/builder/Dockerfile-rpm
+++ b/builder/Dockerfile-rpm
@@ -6,7 +6,7 @@ RUN useradd -ms /bin/bash user
 USER user
 WORKDIR /home/user
 
-ENV RUST=1.39.0
+ENV RUST=1.40.0
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain ${RUST}