diff --git a/build.gradle b/build.gradle
index 5d3dfbf..0179b41 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,7 +19,7 @@ buildscript {
         versions = [
             logback: '1.4.4',
             jetty: '11.0.12',
-            pmd: '6.51.0'
+            pmd: '6.55.0'
         ]
     }