diff --git a/.travis.yml b/.travis.yml
index 61b45a396..67d27b917 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -46,7 +46,7 @@ script:
 # Upload docs
 after_success:
   - |
-    if [[ "$TRAVIS_OS_NAME" == "linux" && "$TRAVIS_PULL_REQUEST" = "false" && "$TRAVIS_BRANCH" == "master" && "$TRAVIS_RUST_VERSION" == "nightly" ]]; then
+    if [[ "$TRAVIS_OS_NAME" == "linux" && "$TRAVIS_PULL_REQUEST" = "false" && "$TRAVIS_BRANCH" == "master" && "$TRAVIS_RUST_VERSION" == "nightly-2017-12-21" ]]; then
       cargo doc --features alpn --no-deps &&
       echo "<meta http-equiv=refresh content=0;url=os_balloon/index.html>" > target/doc/index.html &&
       cargo install mdbook &&