diff --git a/.travis.sh b/.travis.sh
index 1cc6530e7..1d82cacc1 100755
--- a/.travis.sh
+++ b/.travis.sh
@@ -60,6 +60,7 @@ if [ "$TRAVIS_BRANCH" == "master" -a "$TRAVIS_PULL_REQUEST" == "false" ]; then
 
   # Build documentation with overrides and publish to GitHub pages
   mkdocs gh-deploy --force
+  mkdocs --version
 fi
 
 # Remove overrides directory so it won't get included in the image
diff --git a/requirements.txt b/requirements.txt
index 8dddd26bb..e20be0eaf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,6 +19,6 @@
 # IN THE SOFTWARE.
 
 # Direct dependencies
-mkdocs>=0.17.3
+mkdocs>=0.17.3,<1
 Pygments>=2.2
 pymdown-extensions>=4.11