diff --git a/_grammar-test/pom.xml b/_grammar-test/pom.xml
index 1bf5617..9e9c259 100644
--- a/_grammar-test/pom.xml
+++ b/_grammar-test/pom.xml
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-simple</artifactId>
-            <version>1.7.30</version>
+            <version>1.7.31</version>
         </dependency>
     </dependencies>