diff --git a/gradle.properties b/gradle.properties
index 2cf0f79..18d685e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -16,7 +16,7 @@ workflowJobPluginVersion=2.3
 # Dependencies
 byteBuddyVersion=1.8.11
 httpBuilderVersion=0.7.2
-jenkinsTestHarnessVersion=2.48
+jenkinsTestHarnessVersion=2.55
 jenkinsVersion=2.195
 jobDslVersion=1.76
 spockVersion=1.1-groovy-2.4