diff --git a/README.md b/README.md
index 13a9aa5..b9eab70 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ For the time being just enter in your project
 
 ```
 if (project.hasProperty('testsProfiling')) {
-    apply from: 'https://raw.githubusercontent.com/marcingrzejszczak/gradle-test-profiler/0.0.2/test_profiling.gradle'
+    apply from: 'https://raw.githubusercontent.com/marcingrzejszczak/gradle-test-profiler/0.0.4/test_profiling.gradle'
 }
 ```
 
diff --git a/test_profiling.gradle b/test_profiling.gradle
index 0c3ed87..ddb4f19 100644
--- a/test_profiling.gradle
+++ b/test_profiling.gradle
@@ -24,7 +24,7 @@ class ReportRow {
     Double testClassExecutionTime
 }
 
-Set<TestExecutionResult> testExecutionResults = [] as Set
+Set<TestExecutionResult> testExecutionResults = Collections.concurrentSet(new HashSet<TestExecutionResult>())
 
 allprojects {