diff --git a/Gemfile b/Gemfile
index 3aadb40fb..c9bde4fa4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -7,6 +7,6 @@ gem 'nokogiri', '~> 1.12.3'
 gem 'git', '~> 1.9.1'
 gem 'parallel', '~> 1.20.1'
 gem 'puma', '~> 5.4.0'
-gem 'sinatra', '~> 2.1.0'
-gem 'sinatra-contrib', '~> 2.1.0'
+gem 'sinatra', '~> 3.0.4'
+gem 'sinatra-contrib', '~> 3.0.4'
 gem 'i18n', '~> 0.7.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index 751deb864..4562eeaba 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -29,7 +29,7 @@ GEM
     mini_portile2 (2.6.1)
     multi_json (1.15.0)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     nokogiri (1.12.3)
@@ -43,26 +43,26 @@ GEM
     puma (5.4.0)
       nio4r (~> 2.0)
     racc (1.5.2)
-    rack (2.2.3)
-    rack-protection (2.1.0)
+    rack (2.2.4)
+    rack-protection (3.0.4)
       rack
     rchardet (1.8.0)
     ruby2_keywords (0.0.5)
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
-    sinatra (2.1.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.1.0)
+    sinatra (3.0.4)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.4)
       tilt (~> 2.0)
-    sinatra-contrib (2.1.0)
+    sinatra-contrib (3.0.4)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.1.0)
-      sinatra (= 2.1.0)
+      mustermann (~> 3.0)
+      rack-protection (= 3.0.4)
+      sinatra (= 3.0.4)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -76,8 +76,8 @@ DEPENDENCIES
   octokit (~> 4.21.0)
   parallel (~> 1.20.1)
   puma (~> 5.4.0)
-  sinatra (~> 2.1.0)
-  sinatra-contrib (~> 2.1.0)
+  sinatra (~> 3.0.4)
+  sinatra-contrib (~> 3.0.4)
 
 RUBY VERSION
    ruby 2.7.2p137