diff --git a/Gemfile.lock b/Gemfile.lock
index 0b201ea..8fcf30e 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -105,7 +105,7 @@ GEM
       mini_portile2 (~> 2.1.0)
       pkg-config (~> 1.1.7)
     pkg-config (1.1.7)
-    rack (1.6.4)
+    rack (1.6.12)
     rack-accept (0.4.5)
       rack (>= 0.4)
     rack-test (0.6.3)