diff --git a/build.gradle b/build.gradle
index 3f4ea1c..6601454 100644
--- a/build.gradle
+++ b/build.gradle
@@ -21,6 +21,7 @@
     api libs.org.java.websocket.java.websocket
     api libs.org.slf4j.slf4j.nop
     testImplementation libs.junit.junit
+    testImplementation 'junit:junit:4.13.2'
 }
 
 group = 'info.istlab.ServerTester'