diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index 039c4f3824..debf678ce5 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -2,18 +2,20 @@ PATH
   remote: ../..
   specs:
     opal (0.10.2)
+      ast (>= 2.3.0)
       hike (~> 1.2)
+      parser (= 2.5.0.5)
       sourcemap (~> 0.1.0)
-      sprockets (~> 3.1)
-      tilt (>= 1.4)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    concurrent-ruby (1.0.2)
+    ast (2.4.1)
     hike (1.2.3)
+    parser (2.5.0.5)
+      ast (~> 2.4.0)
     puma (3.6.0)
-    rack (1.5.2)
+    rack (1.6.13)
     rack-protection (1.5.3)
       rack
     sinatra (1.4.5)
@@ -21,9 +23,6 @@ GEM
       rack-protection (~> 1.4)
       tilt (~> 1.3, >= 1.3.4)
     sourcemap (0.1.1)
-    sprockets (3.7.0)
-      concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
     tilt (1.4.1)
 
 PLATFORMS