diff --git a/pom.xml b/pom.xml
index 9e7f906..07dbf2e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -91,7 +91,7 @@
     <dependency>
       <groupId>com.google.guava</groupId>
       <artifactId>guava</artifactId>
-      <version>22.0</version>
+      <version>18.0</version>
       <scope>test</scope>
     </dependency>
     <dependency>