diff --git a/build.gradle b/build.gradle
index 11d057f..46b5857 100644
--- a/build.gradle
+++ b/build.gradle
@@ -45,6 +45,7 @@ dependencies {
     antlr "org.antlr:antlr4:$antlr4Version"
 
     testImplementation("junit:junit:4.13.2")
+    testImplementation("org.opentest4j:opentest4j:1.3.0")
 }
 
 task sourcesJar(type: Jar) {