diff --git a/app/ruby/app-issue-creator/Gemfile b/app/ruby/app-issue-creator/Gemfile
index e1bae18..ccd68dd 100644
--- a/app/ruby/app-issue-creator/Gemfile
+++ b/app/ruby/app-issue-creator/Gemfile
@@ -4,4 +4,4 @@ gem "activesupport", "~> 6.1"
 gem "json",        "~> 2.3"
 gem "jwt"
 gem "octokit"
-gem "sinatra",     "~> 2.2.3"
+gem "sinatra", "~> 4.1.0"
diff --git a/app/ruby/app-issue-creator/Gemfile.lock b/app/ruby/app-issue-creator/Gemfile.lock
index 7eb162c..bdc428b 100644
--- a/app/ruby/app-issue-creator/Gemfile.lock
+++ b/app/ruby/app-issue-creator/Gemfile.lock
@@ -9,6 +9,7 @@ GEM
       zeitwerk (~> 2.3)
     addressable (2.8.1)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
     concurrent-ruby (1.2.2)
     faraday (1.10.3)
       faraday-em_http (~> 1.0)
@@ -37,26 +38,33 @@ GEM
       concurrent-ruby (~> 1.0)
     json (2.3.0)
     jwt (1.5.6)
+    logger (1.6.1)
     minitest (5.19.0)
     multipart-post (2.3.0)
-    mustermann (2.0.2)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     octokit (4.7.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (5.0.1)
-    rack (2.2.8.1)
-    rack-protection (2.2.3)
-      rack
+    rack (3.1.8)
+    rack-protection (4.1.1)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     ruby2_keywords (0.0.5)
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
-    sinatra (2.2.3)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.3)
+    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 (2.1.0)
+    tilt (2.4.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     zeitwerk (2.6.11)
@@ -69,7 +77,7 @@ DEPENDENCIES
   json (~> 2.3)
   jwt
   octokit
-  sinatra (~> 2.2.3)
+  sinatra (~> 4.1.0)
 
 BUNDLED WITH
-   1.17.1
+   1.17.3