diff --git a/gradle.properties b/gradle.properties
index 34212489e7..b51a0fcd5e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,3 @@
 gaeVersion=1.9.71
-springBootVersion=2.1.6.RELEASE
+springBootVersion=2.1.9.RELEASE
 version=5.1.7.BUILD-SNAPSHOT