diff --git a/docs/_config.yml b/docs/_config.yml
index a96a76dd9ab5ece69e5eaf4769eb438cd18415c8..e2db274e1f619f135c66e1d588b5e759a58a1585 100644
--- a/docs/_config.yml
+++ b/docs/_config.yml
@@ -17,6 +17,6 @@ SPARK_VERSION: 1.3.0-SNAPSHOT
 SPARK_VERSION_SHORT: 1.3.0
 SCALA_BINARY_VERSION: "2.10"
 SCALA_VERSION: "2.10.4"
-MESOS_VERSION: 0.18.1
+MESOS_VERSION: 0.21.0
 SPARK_ISSUE_TRACKER_URL: https://issues.apache.org/jira/browse/SPARK
 SPARK_GITHUB_URL: https://github.com/apache/spark