diff --git a/Gemfile.lock b/Gemfile.lock
index b722c54..efd6b5a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -19,8 +19,8 @@ GEM
       slop (~> 3.4)
     puma (3.6.2)
     rack (2.0.1)
-    rack-test (0.6.3)
-      rack (>= 1.0)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
     rake (12.0.0)
     rspec (3.5.0)
       rspec-core (~> 3.5.0)