diff --git a/Gemfile.lock b/Gemfile.lock
index 70bcba13..89ae4213 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -126,7 +126,8 @@ GEM
     minitest (5.15.0)
     minitest-rg (5.2.0)
       minitest (~> 5.0)
-    mocha (1.15.0)
+    mocha (2.0.2)
+      ruby2_keywords (>= 0.0.5)
     multipart-post (2.1.1)
     net-imap (0.2.3)
       digest