diff --git a/Gemfile b/Gemfile
index b586954..38cfd3c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 ruby '2.7.0'
 
-gem 'sinatra', '~>2.0.5'
+gem 'sinatra', '~>2.2.0'
 gem 'sinatra-contrib'
 gem 'erubis'
 gem 'minitest'
diff --git a/Gemfile.lock b/Gemfile.lock
index 0df04d0..496e2e9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,12 +1,11 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    backports (3.18.1)
     coderay (1.1.3)
     erubis (2.7.0)
     method_source (1.0.0)
     minitest (5.14.1)
-    multi_json (1.14.1)
+    multi_json (1.15.0)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.2)
@@ -17,22 +16,21 @@ GEM
     puma (4.3.5)
       nio4r (~> 2.0)
     rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack-protection (2.2.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
       mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.0)
       multi_json
       mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      rack-protection (= 2.2.0)
+      sinatra (= 2.2.0)
       tilt (~> 2.0)
     tilt (2.0.10)
 
@@ -46,7 +44,7 @@ DEPENDENCIES
   pry
   puma
   rack-test
-  sinatra (~> 2.0.5)
+  sinatra (~> 2.2.0)
   sinatra-contrib
 
 RUBY VERSION