diff --git a/hooks/ruby/delete-repository-event/Gemfile b/hooks/ruby/delete-repository-event/Gemfile
index 5c45f5d..226c0a0 100644
--- a/hooks/ruby/delete-repository-event/Gemfile
+++ b/hooks/ruby/delete-repository-event/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
 gem "octokit"
-gem "sinatra"
+gem "sinatra", ">= 4.1.0"
diff --git a/hooks/ruby/delete-repository-event/Gemfile.lock b/hooks/ruby/delete-repository-event/Gemfile.lock
index 6696c28..0e8634f 100644
--- a/hooks/ruby/delete-repository-event/Gemfile.lock
+++ b/hooks/ruby/delete-repository-event/Gemfile.lock
@@ -3,6 +3,7 @@ GEM
   specs:
     addressable (2.8.0)
       public_suffix (>= 2.0.2, < 5.0)
+    base64 (0.2.0)
     faraday (1.5.1)
       faraday-em_http (~> 1.0)
       faraday-em_synchrony (~> 1.0)
@@ -20,32 +21,39 @@ GEM
     faraday-net_http (1.0.1)
     faraday-net_http_persistent (1.2.0)
     faraday-patron (1.0.0)
+    logger (1.6.1)
     multipart-post (2.1.1)
-    mustermann (2.0.2)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     octokit (4.6.2)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (4.0.6)
-    rack (2.2.8.1)
-    rack-protection (2.2.3)
-      rack
-    ruby2_keywords (0.0.4)
+    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 (2.0.11)
+    tilt (2.4.0)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   octokit
-  sinatra
+  sinatra (>= 4.1.0)
 
 BUNDLED WITH
-   1.14.6
+   1.17.3