diff --git a/Gemfile.lock b/Gemfile.lock
index 90c20d6..832a0af 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -298,7 +298,7 @@ GEM
     pxlsrt (1.8.2)
       oily_png (~> 1.2.1)
       thor (~> 0.18)
-    rack (2.0.5)
+    rack (2.0.8)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.2.1)