diff --git a/build.gradle b/build.gradle
index b4f11c9..e75b0c7 100644
--- a/build.gradle
+++ b/build.gradle
@@ -98,7 +98,7 @@ jacoco {
 
 checkstyle {
 	configDirectory.set(rootProject.file('src/checkstyle'))
-	toolVersion = '10.0'
+	toolVersion = '9.3'
 }
 
 dependencies {