diff --git a/projects/02-meme-generator-api/examples/bcrypt-example/Gemfile.lock b/projects/02-meme-generator-api/examples/bcrypt-example/Gemfile.lock
index c6b5474..3649aeb 100644
--- a/projects/02-meme-generator-api/examples/bcrypt-example/Gemfile.lock
+++ b/projects/02-meme-generator-api/examples/bcrypt-example/Gemfile.lock
@@ -1,14 +1,14 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    bcrypt (3.1.17)
+    bcrypt (3.1.22)
 
 PLATFORMS
-  x86_64-darwin-21
-  x86_64-linux
+  arm64-darwin-24
+  ruby
 
 DEPENDENCIES
   bcrypt
 
 BUNDLED WITH
-   2.3.8
+  4.0.11
diff --git a/projects/02-meme-generator-api/examples/sinatra-redirect-example/.ruby-version b/projects/02-meme-generator-api/examples/sinatra-redirect-example/.ruby-version
index 94ff29c..7636e75 100644
--- a/projects/02-meme-generator-api/examples/sinatra-redirect-example/.ruby-version
+++ b/projects/02-meme-generator-api/examples/sinatra-redirect-example/.ruby-version
@@ -1 +1 @@
-3.1.1
+4.0.5
diff --git a/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile b/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile
index 942af1d..769f5c7 100644
--- a/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile
+++ b/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile
@@ -2,4 +2,5 @@ source 'https://rubygems.org'
 
 gem 'sinatra'
 gem 'mini_magick'
-gem 'thin'
\ No newline at end of file
+gem 'webrick'
+gem 'rackup'
\ No newline at end of file
diff --git a/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile.lock b/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile.lock
index 30c4870..f556558 100644
--- a/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile.lock
+++ b/projects/02-meme-generator-api/examples/sinatra-redirect-example/Gemfile.lock
@@ -1,33 +1,40 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    daemons (1.4.1)
-    eventmachine (1.2.7)
-    mini_magick (4.11.0)
-    mustermann (1.1.1)
-      ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
-    rack-protection (2.2.0)
-      rack
-    ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    base64 (0.3.0)
+    logger (1.7.0)
+    mini_magick (5.3.1)
+      logger
+    mustermann (3.1.1)
+    rack (3.2.6)
+    rack-protection (4.2.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.1.2)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    rackup (2.3.1)
+      rack (>= 3)
+    sinatra (4.2.1)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.2.1)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    thin (1.8.1)
-      daemons (~> 1.0, >= 1.0.9)
-      eventmachine (~> 1.0, >= 1.0.4)
-      rack (>= 1, < 3)
-    tilt (2.0.10)
+    tilt (2.7.0)
+    webrick (1.9.2)
 
 PLATFORMS
-  x86_64-darwin-21
+  arm64-darwin-24
+  ruby
 
 DEPENDENCIES
   mini_magick
+  rackup
   sinatra
-  thin
+  webrick
 
 BUNDLED WITH
-   2.3.8
+  4.0.11
diff --git a/projects/02-meme-generator-api/requirements.md b/projects/02-meme-generator-api/requirements.md
index 799659b..afaac6a 100644
--- a/projects/02-meme-generator-api/requirements.md
+++ b/projects/02-meme-generator-api/requirements.md
@@ -56,7 +56,7 @@ See in the `/examples` directory a simple sintra app that redirects to an image.
 
 ### General logic flow
 
-You should download the image locally in a folder. Hint you can use [OpenURI](https://ruby-doc.org/stdlib-3.1.0/libdoc/open-uri/rdoc/OpenURI.html) and then simple save the content to a file locally. 
+You should download the image locally in a folder. Hint you can use [OpenURI](https://docs.ruby-lang.org/en/4.0/OpenURI.html) and then simple save the content to a file locally. 
 
 Then convert it with ImageMagick via the Ruby gem. See the section below.