diff --git a/build.gradle b/build.gradle
index 471851cbd2..737e430c3f 100644
--- a/build.gradle
+++ b/build.gradle
@@ -30,7 +30,7 @@ allprojects {
 
 	ext.releaseBuild = version.endsWith('RELEASE')
 	ext.snapshotBuild = version.endsWith('SNAPSHOT')
-	ext.springVersion = '4.3.19.RELEASE'
+	ext.springVersion = '4.3.21.RELEASE'
 	ext.springLdapVersion = '2.3.2.RELEASE'
 
 	group = 'org.springframework.security'