diff --git a/build.gradle b/build.gradle
index b6a448ec..db8e2794 100644
--- a/build.gradle
+++ b/build.gradle
@@ -30,5 +30,5 @@ dependencies {
     compile group: 'com.amazonaws', name: 'amazon-kinesis-client', version: '1.14.8'
 
     compile group: 'com.fasterxml.jackson.dataformat', name: 'jackson-dataformat-ion', version: '2.14.1'
-    compile group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: '2.19.0'
+    compile group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: '2.21.1'
 }