diff --git a/build.gradle b/build.gradle
index 8ba29c2..36358a8 100644
--- a/build.gradle
+++ b/build.gradle
@@ -231,7 +231,7 @@ signing {
 
 dependencies {
 	testImplementation "junit:junit:4.13.2"
-	testImplementation 'com.google.protobuf:protobuf-java:3.20.1'
+	testImplementation 'com.google.protobuf:protobuf-java:3.21.1'
 	testRuntimeOnly 'org.apache.logging.log4j:log4j-core:2.17.2'
 	testRuntimeOnly 'org.apache.logging.log4j:log4j-jpl:2.17.2'
 }