diff --git a/code-quality.gradle b/code-quality.gradle
index fed4c0f..df3f719 100644
--- a/code-quality.gradle
+++ b/code-quality.gradle
@@ -63,7 +63,7 @@ spotbugsMain {
 pmd {
   ruleSets = [] //specifically set this to be empty, otherwise gradle includes the defaults in addition to our custom ruleset! 
   ruleSetConfig = resources.text.fromFile("config/pmd/ruleset.xml")
-  toolVersion = "7.13.0"
+  toolVersion = "7.21.0"
 }
 
 jacocoTestCoverageVerification {