diff --git a/Gemfile.lock b/Gemfile.lock
index 1a031a30d62..86b62527cd1 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -515,7 +515,8 @@ GEM
       actionmailer (>= 3)
       net-smtp
       premailer (~> 1.7, >= 1.7.9)
-    prometheus-client (4.2.2)
+    prometheus-client (4.2.3)
+      base64
     promise.rb (0.7.4)
     psych (5.2.1)
       date