diff --git a/.travis.yml b/.travis.yml
index d3f8c116607b..75b45c9db403 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -63,8 +63,7 @@ matrix:
     - env: INTEGRATION=chronotope/chrono
     - env: INTEGRATION=serde-rs/serde
     - env: INTEGRATION=Geal/nom
-# uncomment once https://github.com/rust-lang/rust/issues/55376 is fixed
-#    - env: INTEGRATION=hyperium/hyper
+    - env: INTEGRATION=hyperium/hyper
   allow_failures:
   - os: windows
     env: BASE_TEST=true
@@ -75,14 +74,13 @@ matrix:
     - os: windows
 
 script:
-  # uncomment once https://github.com/rust-lang/rust/issues/55376 is fixed
-  # - |
-  #     rm rust-toolchain
-  #     cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
-  #     RUSTC_HASH=$(git ls-remote https://github.com/rust-lang/rust.git master | awk '{print $1}')
-  #     travis_retry rustup-toolchain-install-master -f -n master $RUSTC_HASH
-  #     rustup default master
-  #     export LD_LIBRARY_PATH=$(rustc --print sysroot)/lib
+  - |
+      rm rust-toolchain
+      cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
+      RUSTC_HASH=$(git ls-remote https://github.com/rust-lang/rust.git master | awk '{print $1}')
+      travis_retry rustup-toolchain-install-master -f -n master $RUSTC_HASH
+      rustup default master
+      export LD_LIBRARY_PATH=$(rustc --print sysroot)/lib
   - |
     if [ -z ${INTEGRATION} ]; then
       ./ci/base-tests.sh && sleep 5
diff --git a/appveyor.yml b/appveyor.yml
index 18f25e916f3f..fb0b326c713b 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -20,12 +20,11 @@ install:
     - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
     - git ls-remote https://github.com/rust-lang/rust.git master | awk '{print $1}' >rustc-hash.txt
     - set /p RUSTC_HASH=<rustc-hash.txt
-# uncomment once https://github.com/rust-lang/rust/issues/55376 is fixed
-#    - del rust-toolchain
-#    - cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
-#    - rustup-toolchain-install-master %RUSTC_HASH% -f -n master
-#    - rustup default master
-#    - set PATH=%PATH%;C:\Users\appveyor\.rustup\toolchains\master\bin
+    - del rust-toolchain
+    - cargo install rustup-toolchain-install-master || echo "rustup-toolchain-install-master already installed"
+    - rustup-toolchain-install-master %RUSTC_HASH% -f -n master
+    - rustup default master
+    - set PATH=%PATH%;C:\Users\appveyor\.rustup\toolchains\master\bin
     - rustc -V
     - cargo -V