diff --git a/spec/tester_mongo_rails_6/Gemfile.lock b/spec/tester_mongo_rails_6/Gemfile.lock
index c3ec35fe..ce512a5a 100644
--- a/spec/tester_mongo_rails_6/Gemfile.lock
+++ b/spec/tester_mongo_rails_6/Gemfile.lock
@@ -164,7 +164,8 @@ GEM
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.1.14)
-    rack-session (2.0.0)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
       rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)