diff --git a/build.gradle b/build.gradle
index 7ea99c8..11cfc7d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -7,7 +7,7 @@ buildscript {
     dependencies {
         classpath 'com.palantir.gradle.jdks:gradle-jdks:0.58.0'
         classpath 'com.palantir.gradle.jdkslatest:gradle-jdks-latest:0.16.0'
-        classpath 'com.palantir.gradle.plugintesting:gradle-plugin-testing:0.2.0'
+        classpath 'com.palantir.gradle.plugintesting:gradle-plugin-testing:0.4.0'
         classpath 'com.palantir.jakartapackagealignment:jakarta-package-alignment:0.6.0'
         classpath 'com.palantir.gradle.externalpublish:gradle-external-publish-plugin:1.19.0'
         classpath 'com.palantir.gradle.failure-reports:gradle-failure-reports:1.13.0'
diff --git a/versions.lock b/versions.lock
index 1803c1b..dabdb43 100644
--- a/versions.lock
+++ b/versions.lock
@@ -7,5 +7,5 @@ com.google.guava:failureaccess:1.0.2 (1 constraints: 150ae2b4)
 com.google.guava:guava:33.3.1-jre (2 constraints: d31e777d)
 com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava (1 constraints: bd17c918)
 com.google.j2objc:j2objc-annotations:3.0.0 (1 constraints: 150aeab4)
-com.palantir.gradle.plugintesting:plugin-testing-core:0.2.0 (1 constraints: 0405f135)
+com.palantir.gradle.plugintesting:plugin-testing-core:0.4.0 (1 constraints: 0605f735)
 org.checkerframework:checker-qual:3.43.0 (1 constraints: 4c0a4abf)