diff --git a/sinatra-BE/Gemfile b/sinatra-BE/Gemfile
index da9cde5..4badc76 100644
--- a/sinatra-BE/Gemfile
+++ b/sinatra-BE/Gemfile
@@ -3,5 +3,5 @@ source "https://rubygems.org"
 ruby "2.4.1"
 
 gem "shotgun", "0.9.2"
-gem "sinatra", "2.0.1"
+gem "sinatra", "2.2.3"
 gem "sinatra-cors", "1.1.0"
diff --git a/sinatra-BE/Gemfile.lock b/sinatra-BE/Gemfile.lock
index 22c1cbb..5c2cc56 100644
--- a/sinatra-BE/Gemfile.lock
+++ b/sinatra-BE/Gemfile.lock
@@ -1,26 +1,28 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    mustermann (1.0.2)
-    rack (2.0.4)
-    rack-protection (2.0.1)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
+    ruby2_keywords (0.0.5)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.0.1)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.1)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
     sinatra-cors (1.1.0)
-    tilt (2.0.8)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
 
 DEPENDENCIES
   shotgun (= 0.9.2)
-  sinatra (= 2.0.1)
+  sinatra (= 2.2.3)
   sinatra-cors (= 1.1.0)
 
 RUBY VERSION