diff --git a/test/unit/groovy/helpers/PipelineTestHelper.groovy b/test/unit/groovy/helpers/PipelineTestHelper.groovy
index 8b44f0c..1d37f05 100644
--- a/test/unit/groovy/helpers/PipelineTestHelper.groovy
+++ b/test/unit/groovy/helpers/PipelineTestHelper.groovy
@@ -277,7 +277,7 @@ class PipelineTestHelper extends BasePipelineTest {
         helper.registerAllowedMethod('fileExists', [Map.class], { args -> fileExists(args) })
         helper.registerAllowedMethod('fileExists', [String.class], { args -> fileExists(args) })
 
-        helper.registerAllowedMethod('readJson', [Map.class], {args -> readJSON(args)})
+        helper.registerAllowedMethod('readJSON', [Map.class], {args -> readJSON(args)})
     }
 
     /**
diff --git a/vars/getLibraryVersion.groovy b/vars/getLibraryVersion.groovy
index e4a0c9b..048dc56 100644
--- a/vars/getLibraryVersion.groovy
+++ b/vars/getLibraryVersion.groovy
@@ -43,7 +43,7 @@ String call(Map conf = [:]) {
             }
 
             def response = httpRequest(requestConfig)
-            return readJson(text: response.content).tag_name
+            return readJSON(text: response.content).tag_name
         }
     }
     // All others get the "stable" tag