diff --git a/circuit_breaker/backend/Gemfile b/circuit_breaker/backend/Gemfile
index 6f1f397..2f6a169 100644
--- a/circuit_breaker/backend/Gemfile
+++ b/circuit_breaker/backend/Gemfile
@@ -1,4 +1,4 @@
 source "https://rubygems.org"
 
-gem 'sinatra', '~> 2.0'
+gem 'sinatra', '~> 2.2'
 gem 'sinatra-contrib', '~> 2.0'
diff --git a/circuit_breaker/backend/Gemfile.lock b/circuit_breaker/backend/Gemfile.lock
index 41f357b..06ef795 100644
--- a/circuit_breaker/backend/Gemfile.lock
+++ b/circuit_breaker/backend/Gemfile.lock
@@ -1,33 +1,31 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    backports (3.17.2)
     multi_json (1.14.1)
-    mustermann (1.1.1)
+    mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.3)
-    rack-protection (2.0.8.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
-    ruby2_keywords (0.0.2)
-    sinatra (2.0.8.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.8.1)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.8.1)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.8.1)
-      sinatra (= 2.0.8.1)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
-  sinatra (~> 2.0)
+  sinatra (~> 2.2)
   sinatra-contrib (~> 2.0)
 
 BUNDLED WITH