diff --git a/pathdb/datastax/pom.xml b/pathdb/datastax/pom.xml
index f52cb3e..742d5d3 100644
--- a/pathdb/datastax/pom.xml
+++ b/pathdb/datastax/pom.xml
@@ -61,7 +61,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>21.0</version>
+            <version>23.0</version>
         </dependency>
         <dependency>
             <groupId>org.cassandraunit</groupId>
diff --git a/storage/pom.xml b/storage/pom.xml
index 0d9bc46..1f6cd20 100644
--- a/storage/pom.xml
+++ b/storage/pom.xml
@@ -82,7 +82,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>21.0</version>
+            <version>23.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>