diff --git a/Gemfile.lock b/Gemfile.lock
index d3529c3..be9a3f3 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -50,7 +50,7 @@ GEM
       faraday (>= 0.9)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (4.0.7)
-    rack (2.2.3)
+    rack (2.2.3.1)
     ruby2_keywords (0.0.5)
     sawyer (0.8.2)
       addressable (>= 2.3.5)