diff --git a/pbj-core/hiero-dependency-versions/build.gradle.kts b/pbj-core/hiero-dependency-versions/build.gradle.kts
index e5078c88..b7e06493 100644
--- a/pbj-core/hiero-dependency-versions/build.gradle.kts
+++ b/pbj-core/hiero-dependency-versions/build.gradle.kts
@@ -7,7 +7,7 @@ val helidon = "4.3.2"
 val protobuf = "4.31.1"
 
 val junit5 = "5.13.4"
-val mockito = "5.20.0"
+val mockito = "5.21.0"
 
 dependencies { api(platform("io.netty:netty-bom:4.2.6.Final")) }