diff --git a/DemoApp/Gemfile.lock b/DemoApp/Gemfile.lock
index 9f2aee0..5183f97 100644
--- a/DemoApp/Gemfile.lock
+++ b/DemoApp/Gemfile.lock
@@ -1,3 +1,11 @@
+PATH
+  remote: ..
+  specs:
+    rack-u2f (0.1.4)
+      mustache (~> 1.0)
+      rack (~> 2.0)
+      u2f (~> 1.0)
+
 GEM
   remote: https://rubygems.org/
   specs:
@@ -75,22 +83,20 @@ GEM
       mini_mime (>= 0.1.1)
     method_source (0.9.0)
     mini_mime (1.0.0)
-    mini_portile2 (2.3.0)
+    mini_portile2 (2.8.5)
     minitest (5.10.3)
     multi_json (1.12.2)
-    mustache (1.0.5)
+    mustache (1.1.1)
     nio4r (2.1.0)
-    nokogiri (1.8.1)
-      mini_portile2 (~> 2.3.0)
+    nokogiri (1.15.6)
+      mini_portile2 (~> 2.8.2)
+      racc (~> 1.4)
     public_suffix (3.0.0)
     puma (3.10.0)
+    racc (1.7.3)
     rack (2.0.3)
     rack-test (0.7.0)
       rack (>= 1.0, < 3)
-    rack-u2f (0.1.1)
-      mustache (~> 1.0)
-      rack (~> 2.0)
-      u2f (~> 1.0)
     rails (5.1.4)
       actioncable (= 5.1.4)
       actionmailer (= 5.1.4)
@@ -173,7 +179,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
   puma (~> 3.7)
-  rack-u2f (= 0.1.1)
+  rack-u2f!
   rails (~> 5.1.2)
   redis
   sass-rails (~> 5.0)