diff --git a/examples/sinatra/Gemfile b/examples/sinatra/Gemfile
index bcb5db24c..3d1e3d8b9 100644
--- a/examples/sinatra/Gemfile
+++ b/examples/sinatra/Gemfile
@@ -3,4 +3,4 @@ source 'https://rubygems.org'
 gem 'sinatra', '< 4.0'
 gem 'webrick'
 gem "jruby-rack", "~> 1.2"
-gem 'rack', '2.2.8'
\ No newline at end of file
+gem 'rack', '2.2.14'
\ No newline at end of file
diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index 39e76bd3d..a77110805 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -1,12 +1,18 @@
 GEM
-  remote: http://rubygems.org/
+  remote: https://rubygems.org/
   specs:
-    rack (1.3.3)
+    jruby-rack (1.2.4)
+    rack (2.2.14)
     sinatra (1.0)
       rack (>= 1.0)
+    webrick (1.9.1)
 
 PLATFORMS
   java
+  x86_64-linux
 
 DEPENDENCIES
-  sinatra
+  jruby-rack (~> 1.2)
+  rack (= 2.2.14)
+  sinatra (< 4.0)
+  webrick