diff --git a/buildSrc/build.gradle.kts b/buildSrc/build.gradle.kts
index 855bf6f396..8bdd7b0d48 100644
--- a/buildSrc/build.gradle.kts
+++ b/buildSrc/build.gradle.kts
@@ -45,7 +45,7 @@ dependencies {
   implementation(enforcedPlatform("com.squareup.wire:wire-bom:4.8.1"))
   implementation("com.google.auto.value:auto-value-annotations:1.10.3")
   // When updating, update above in plugins too
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.20.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.21.0")
   // Needed for japicmp but not automatically brought in for some reason.
   implementation("com.google.guava:guava:32.1.2-jre")
   implementation("com.squareup:javapoet:1.13.0")