[AETHER-966] Upgrade errorprone to 2.3.4

Change-Id: Ibc0e804333b234e9ade3ddb610dbbc30aee3ecd7
diff --git a/tools/package/dependencies/template.pom b/tools/package/dependencies/template.pom
index 8a67b3b..a5aac3a 100644
--- a/tools/package/dependencies/template.pom
+++ b/tools/package/dependencies/template.pom
@@ -37,7 +37,7 @@
         <maven.version.min>3.3.9</maven.version.min>
         <java.version.min><!-- JAVA_VERSION --></java.version.min>
         <onos.version><!-- ONOS_VERSION --></onos.version>
-        <errorprone.version>2.3.3</errorprone.version>
+        <errorprone.version>2.3.4</errorprone.version>
     </properties>
 
     <dependencyManagement>