diff --git a/Gemfile.lock b/Gemfile.lock
index c623429..f01dc7e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,7 +89,8 @@ GEM
     public_suffix (6.0.0)
     racc (1.8.1)
     rack (3.1.16)
-    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)