diff --git a/test_runner/build.gradle.kts b/test_runner/build.gradle.kts
index 33deaedccf..fefb7b898b 100644
--- a/test_runner/build.gradle.kts
+++ b/test_runner/build.gradle.kts
@@ -27,10 +27,24 @@ shadowJar.apply {
     archiveClassifier.set("")
     archiveBaseName.set(artifactID)
     mergeServiceFiles()
+    minimize {
+        exclude(dependency(Libs.KOTLIN_REFLECT))
+        exclude(dependency(Libs.JACKSON_XML))
+        exclude(dependency(Libs.JACKSON_DATABIND))
+        exclude(dependency(Libs.JACKSON_KOTLIN))
+        exclude(dependency(Libs.JACKSON_YAML))
+        exclude(dependency(Libs.GSON))
+    }
     @Suppress("UnstableApiUsage")
     manifest {
         attributes(mapOf("Main-Class" to "ftl.Main"))
     }
+    dependencies {
+        exclude(dependency(Libs.TRUTH))
+        exclude(dependency(Libs.MOCKK))
+        exclude(dependency(Libs.JUNIT))
+        exclude(dependency(Libs.DETEKT_FORMATTING))
+    }
 }
 
 // https://bintray.com/flank/maven