diff --git a/build.gradle b/build.gradle
index 510cde8..65919cd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -74,7 +74,7 @@ subprojects { Project sub ->
 
         testImplementation project.deps.gocdPluginApi
         testImplementation 'org.mockito:mockito-core:5.12.0'
-        testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.26.0'
+        testImplementation group: 'org.assertj', name: 'assertj-core', version: '3.26.3'
         testImplementation platform('org.junit:junit-bom:5.10.3')
         testImplementation group: 'org.junit.jupiter', name: 'junit-jupiter-api'
         testRuntimeOnly group: 'org.junit.jupiter', name: 'junit-jupiter-engine'