diff --git a/pom.xml b/pom.xml
index a31293a45..26fb9a8cd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -59,7 +59,7 @@
     <asakusafw.version>0.10.5-SNAPSHOT</asakusafw.version>
     <hadoop.version>2.7.3</hadoop.version>
     <asm.version>5.1</asm.version>
-    <gson.version>2.8.1</gson.version>
+    <gson.version>2.8.9</gson.version>
     <jackson.version>2.9.7</jackson.version>
     <h2.version>1.4.196</h2.version>
     <lz4.version>1.5.1</lz4.version>