diff --git a/build.gradle b/build.gradle
index 149724f..2c403b7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,7 +3,7 @@ buildscript {
         versions = [:]
         versions.guava = '13.0.1'
         versions.junit = '4.13'
-        versions.kotlin = '1.3.21'
+        versions.kotlin = '1.5.21'
         versions.lint = '22.2.0'
         versions.mockito = '1.9.5'
         versions.simplexml = '2.7.1'