diff --git a/Gemfile.lock b/Gemfile.lock
index 16fa91e..bce9636 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -501,7 +501,7 @@ GEM
       rails (~> 5.0)
       rdf
     racc (1.5.2)
-    rack (2.2.3)
+    rack (2.2.6.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
     rails (5.1.6)