diff --git a/Gemfile.lock b/Gemfile.lock
index 9d474bb..7b4cc08 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -28,7 +28,7 @@ GEM
     mocha (2.2.0)
       ruby2_keywords (>= 0.0.5)
     mutex_m (0.2.0)
-    rack (3.0.16)
+    rack (3.1.20)
     rack-test (2.1.0)
       rack (>= 1.3)
     rake (13.2.1)