diff --git a/gradle.properties b/gradle.properties
index 12317f330a..4e2c7fb6b9 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 #
-kotlinVersion=1.2.20
+kotlinVersion=1.2.21
 junitVersion=1.0.2
 jupiterVersion=5.0.2
 junitLegacyVersion=4.12.0