diff --git a/codegen/gradle/libs.versions.toml b/codegen/gradle/libs.versions.toml
index ac30c2c2..5609f921 100644
--- a/codegen/gradle/libs.versions.toml
+++ b/codegen/gradle/libs.versions.toml
@@ -1,7 +1,7 @@
 [versions]
 junit5 = "6.0.2"
 smithy = "1.65.0"
-mockito = "5.20.0"
+mockito = "5.21.0"
 test-logger-plugin = "4.0.0"
 spotbugs = "6.0.22"
 spotless = "8.1.0"