diff --git a/Gemfile.lock b/Gemfile.lock
index 9a40358..98b5187 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,8 @@ GEM
     concurrent-ruby (1.3.4)
     connection_pool (2.4.1)
     csv (3.3.0)
-    dnsruby (1.72.2)
+    dnsruby (1.72.3)
+      base64 (~> 0.2.0)
       simpleidn (~> 0.2.1)
     drb (2.2.1)
     em-websocket (0.5.3)