diff --git a/build.gradle b/build.gradle
index 0fc0807..1b3b793 100644
--- a/build.gradle
+++ b/build.gradle
@@ -36,7 +36,7 @@ ext {
     junit4Version = '4.13.2'
     junitJupiterVersion = '5.7.1'
     lombokVersion = '1.18.18'
-    protobufVersion = '3.15.5'
+    protobufVersion = '3.15.6'
     slf4jVersion = '1.7.30'
     testcontainersVersion = '1.15.2'
 }