diff --git a/examples/rails_4_button_example/Gemfile.lock b/examples/rails_4_button_example/Gemfile.lock
index 9597a9d..a4b6a62 100644
--- a/examples/rails_4_button_example/Gemfile.lock
+++ b/examples/rails_4_button_example/Gemfile.lock
@@ -39,7 +39,7 @@ GEM
     arel (6.0.0)
     binding_of_caller (0.7.2)
       debug_inspector (>= 0.0.1)
-    builder (3.2.2)
+    builder (3.2.4)
     byebug (4.0.5)
       columnize (= 0.9.0)
     coffee-rails (4.1.0)
@@ -50,12 +50,15 @@ GEM
       execjs
     coffee-script-source (1.9.1.1)
     columnize (0.9.0)
+    concurrent-ruby (1.1.10)
+    crass (1.0.6)
     debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (2.5.2)
     globalid (0.3.5)
       activesupport (>= 4.1.0)
-    i18n (0.7.0)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     jbuilder (2.2.13)
       activesupport (>= 3.0.0, < 5)
       multi_json (~> 1.2)
@@ -63,18 +66,21 @@ GEM
       rails-dom-testing (~> 1.0)
       railties (>= 4.2.0)
       thor (>= 0.14, < 2.0)
-    json (1.8.2)
-    loofah (2.0.1)
+    json (1.8.6)
+    loofah (2.19.0)
+      crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     mime-types (2.4.3)
-    mini_portile (0.6.2)
-    minitest (5.6.0)
+    mini_portile2 (2.8.0)
+    minitest (5.16.3)
     multi_json (1.11.0)
-    nokogiri (1.6.6.2)
-      mini_portile (~> 0.6.0)
-    rack (1.6.0)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    racc (1.6.0)
+    rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)
     rails (4.2.1)
@@ -88,14 +94,14 @@ GEM
       bundler (>= 1.3.0, < 2.0)
       railties (= 4.2.1)
       sprockets-rails
-    rails-deprecated_sanitizer (1.0.3)
+    rails-deprecated_sanitizer (1.0.4)
       activesupport (>= 4.2.0.alpha)
-    rails-dom-testing (1.0.6)
-      activesupport (>= 4.2.0.beta, < 5.0)
-      nokogiri (~> 1.6.0)
+    rails-dom-testing (1.0.9)
+      activesupport (>= 4.2.0, < 5.0)
+      nokogiri (~> 1.6)
       rails-deprecated_sanitizer (>= 1.0.1)
-    rails-html-sanitizer (1.0.2)
-      loofah (~> 2.0)
+    rails-html-sanitizer (1.4.3)
+      loofah (~> 2.3)
     railties (4.2.1)
       actionpack (= 4.2.1)
       activesupport (= 4.2.1)
@@ -123,11 +129,11 @@ GEM
     sqlite3 (1.3.10)
     state_pattern (2.0.2)
     thor (0.19.1)
-    thread_safe (0.3.5)
+    thread_safe (0.3.6)
     tilt (1.4.1)
     turbolinks (2.5.3)
       coffee-rails
-    tzinfo (1.2.2)
+    tzinfo (1.2.10)
       thread_safe (~> 0.1)
     uglifier (2.7.1)
       execjs (>= 0.3.0)