diff --git a/Gemfile.lock b/Gemfile.lock
index da57ea4c..6be17a76 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -261,7 +261,7 @@ GEM
     mini_mime (1.1.5)
     mini_portile2 (2.8.7)
     minitest (5.25.1)
-    mongo (2.20.1)
+    mongo (2.21.0)
       bson (>= 4.14.1, < 6.0.0)
     mongoid (9.0.1)
       activemodel (>= 5.1, < 7.2, != 7.0.0)