diff --git a/pom.xml b/pom.xml
index d20b6dd..f8bb83c 100644
--- a/pom.xml
+++ b/pom.xml
@@ -45,10 +45,10 @@
         <commons-io.version>2.11.0</commons-io.version>
         <dropwizard-swagger.version>1.3.0-1</dropwizard-swagger.version>
         <dropwizard.version>1.3.0</dropwizard.version>
-        <graphviz-java.version>0.8.1</graphviz-java.version>
+        <graphviz-java.version>0.15.1</graphviz-java.version>
         <graphviz-wrapper.version>1.1</graphviz-wrapper.version>
         <groovy.version>1.0-jsr-05-1</groovy.version>
-        <guava.version>24.1.1-jre</guava.version>
+        <guava.version>30.0-jre</guava.version>
         <jackson.version>2.13.0</jackson.version><!-- use version dropwizard uses -->
         <javax.ws.rs-api.version>2.1</javax.ws.rs-api.version>
         <jaxb-api.version>2.3.1</jaxb-api.version>