diff --git a/pom.xml b/pom.xml
index 5cd8d12..0e1215e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -208,7 +208,7 @@
     </reporting>
 
     <properties>
-        <slf4j.version>1.5.11</slf4j.version>
+        <slf4j.version>1.7.21</slf4j.version>
     </properties>
 
     <dependencies>