diff --git a/examples/sinatra/Gemfile b/examples/sinatra/Gemfile
index 3d1e3d8b9..1aae7f37c 100644
--- a/examples/sinatra/Gemfile
+++ b/examples/sinatra/Gemfile
@@ -1,6 +1,6 @@
 source 'https://rubygems.org'
 
-gem 'sinatra', '< 4.0'
+gem 'sinatra', '< 5.0'
 gem 'webrick'
 gem "jruby-rack", "~> 1.2"
-gem 'rack', '2.2.14'
\ No newline at end of file
+gem 'rack', '3.2.0'
\ No newline at end of file
diff --git a/examples/sinatra/Gemfile.lock b/examples/sinatra/Gemfile.lock
index a77110805..ec449153a 100644
--- a/examples/sinatra/Gemfile.lock
+++ b/examples/sinatra/Gemfile.lock
@@ -1,10 +1,28 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.3.0)
     jruby-rack (1.2.4)
-    rack (2.2.14)
-    sinatra (1.0)
-      rack (>= 1.0)
+    logger (1.7.0)
+    mustermann (3.0.4)
+      ruby2_keywords (~> 0.0.1)
+    rack (3.2.0)
+    rack-protection (4.1.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    ruby2_keywords (0.0.5)
+    sinatra (4.1.1)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.1)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
+    tilt (2.6.1)
     webrick (1.9.1)
 
 PLATFORMS
@@ -13,6 +31,6 @@ PLATFORMS
 
 DEPENDENCIES
   jruby-rack (~> 1.2)
-  rack (= 2.2.14)
-  sinatra (< 4.0)
+  rack (= 3.2.0)
+  sinatra (< 5.0)
   webrick