diff --git a/build/docker/README.md b/build/docker/README.md
index b65f74b..ce79985 100644
--- a/build/docker/README.md
+++ b/build/docker/README.md
@@ -192,6 +192,6 @@
 | python    | 2.7.12        | 2.7.15rc1     |       |
 | python3   | 3.5.2         | 3.6.7         |       |
 | ruby      | 2.3.1p112     | 2.5.1p57      |       |
-| rust      | 1.30.0        | 1.30.0        |       |
+| rust      | 1.35.0        | 1.35.0        |       |
 | smalltalk |               |               | Not in CI |
 | swift     |               | 4.2.1         |       |
diff --git a/build/docker/ubuntu-bionic/Dockerfile b/build/docker/ubuntu-bionic/Dockerfile
index c8131bb..b508b1e 100644
--- a/build/docker/ubuntu-bionic/Dockerfile
+++ b/build/docker/ubuntu-bionic/Dockerfile
@@ -257,7 +257,7 @@
       ruby-bundler
 
 # Rust dependencies
-RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y
+RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.35.0 -y
 
 # Swift on Linux for cross tests
 RUN cd / && \
diff --git a/build/docker/ubuntu-xenial/Dockerfile b/build/docker/ubuntu-xenial/Dockerfile
index 97aaaea..119d4cd 100644
--- a/build/docker/ubuntu-xenial/Dockerfile
+++ b/build/docker/ubuntu-xenial/Dockerfile
@@ -255,7 +255,7 @@
       ruby-bundler
 
 # Rust dependencies
-RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain stable -y
+RUN curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain 1.35.0 -y
 
 # Clean up
 RUN rm -rf /var/cache/apt/* && \