diff --git a/scripts/travis b/scripts/travis
index 0d8792dd7..ac344ea19 100755
--- a/scripts/travis
+++ b/scripts/travis
@@ -41,7 +41,7 @@ fi
 echo "$TRAVIS_BRANCH" | grep -qvE "^[0-9.]+$" && exit 0; :;
 
 # Install dependencies for release build
-pip install wheel twine
+pip install --ignore-installed wheel twine
 
 # Build and install theme and Docker image
 python setup.py build sdist bdist_wheel --universal