diff --git a/.travis.yml b/.travis.yml
index 077a17e0bace..bf8c7bcca35d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,6 +30,10 @@ install:
   - npm install remark-cli remark-lint
 
 script:
+ - cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
+ - RUSTC_HEAD=`git ls-remote https://github.com/rust-lang/rust.git HEAD | tr -d ",." | tr " \t" "\n" | grep -e "HEAD" -v`
+ - travis_retry rustup-toolchain-install-master $RUSTC_HEAD
+ - rustup default $RUSTC_HEAD
  - PATH=$PATH:./node_modules/.bin
  - remark -f *.md > /dev/null
  - set -e
diff --git a/appveyor.yml b/appveyor.yml
index 32ea8c62a2de..4625b1c05821 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -17,6 +17,11 @@ install:
     - rustup-init.exe -y --default-host %TARGET% --default-toolchain nightly
     - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin;C:\Users\appveyor\.rustup\toolchains\nightly-%TARGET%\bin
     - if defined MSYS2_BITS set PATH=%PATH%;C:\msys64\mingw%MSYS2_BITS%\bin
+    - cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
+    - set RUSTC_HEAD=`git ls-remote https://github.com/rust-lang/rust.git HEAD | tr -d ",." | tr " \t" "\n" | grep -e "HEAD" -v`
+    - rustup-toolchain-install-master %RUSTC_HEAD%
+    - rustup default %RUSTC_HEAD%
+    - set PATH=%PATH%;C:\Users\appveyor\.rustup\toolchains\%RUSTC_HEAD%\bin
     - rustc -V
     - cargo -V