diff --git a/build.gradle b/build.gradle
index f7be9001..1854500e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -52,6 +52,7 @@ dependencies {
     implementation "org.antlr:antlr4-intellij-adaptor:0.1"
     implementation group: 'org.jfree', name: 'org.jfree.svg', version: '5.0.6'
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
+    testImplementation("org.opentest4j:opentest4j:1.3.0")
     testImplementation group: 'org.mockito', name: 'mockito-core', version: '5.13.0'
 }