diff --git a/.travis.yml b/.travis.yml
index 1e3ed3744..11abe386f 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,7 +30,10 @@ matrix:
 
 before_install:
   # https://github.com/travis-ci/travis-ci/issues/6307
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then rvm get head; fi
+  - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then
+      gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3;
+      rvm get head;
+    fi
 
 install:
   - if [ "${TRAVIS_OS_NAME}" == "linux" ]; then