diff --git a/oysteikt-calc/pom.xml b/oysteikt-calc/pom.xml
index 7d10054..fbfa3bb 100644
--- a/oysteikt-calc/pom.xml
+++ b/oysteikt-calc/pom.xml
@@ -65,6 +65,14 @@
       <scope>test</scope>
     </dependency>
 
+    <!-- Monocle - Headless UI testing in CI -->
+    <dependency>
+      <groupId>org.testfx</groupId>
+      <artifactId>openjfx-monocle</artifactId>
+      <version>jdk-12.0.1+2</version>
+      <scope>test</scope>
+    </dependency>
+
   </dependencies>
 
   <build>