diff --git a/build.gradle b/build.gradle
index d4e94e0..075f521 100644
--- a/build.gradle
+++ b/build.gradle
@@ -72,6 +72,6 @@ dependencies {
     compile fileTree(dir: 'lib', include: ['*.jar'])
     // https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12
     compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.25'
-    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.25'
+    compile group: 'org.slf4j', name: 'slf4j-simple', version: '1.7.30'
     compile group: 'com.puppycrawl.tools', name: 'checkstyle', version: '8.22'
 }