diff --git a/api/ruby/basics-of-authentication/Gemfile b/api/ruby/basics-of-authentication/Gemfile
index 59955820a..4524e4f38 100644
--- a/api/ruby/basics-of-authentication/Gemfile
+++ b/api/ruby/basics-of-authentication/Gemfile
@@ -1,5 +1,5 @@
 source "http://rubygems.org"
 
 gem "json",        "~> 1.8"
-gem 'sinatra',     '~> 1.3.5'
+gem 'sinatra',     '~> 2.2.3'
 gem 'rest-client', '~> 1.6.3'
diff --git a/api/ruby/basics-of-authentication/Gemfile.lock b/api/ruby/basics-of-authentication/Gemfile.lock
index 0bfb0d924..8aee2a909 100644
--- a/api/ruby/basics-of-authentication/Gemfile.lock
+++ b/api/ruby/basics-of-authentication/Gemfile.lock
@@ -3,16 +3,20 @@ GEM
   specs:
     json (1.8.3)
     mime-types (1.21)
-    rack (1.5.2)
-    rack-protection (1.3.2)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rest-client (1.6.7)
       mime-types (>= 1.16)
-    sinatra (1.3.5)
-      rack (~> 1.4)
-      rack-protection (~> 1.3)
-      tilt (~> 1.3, >= 1.3.3)
-    tilt (1.3.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
+      tilt (~> 2.0)
+    tilt (2.0.11)
 
 PLATFORMS
   ruby
@@ -20,7 +24,7 @@ PLATFORMS
 DEPENDENCIES
   json (~> 1.8)
   rest-client (~> 1.6.3)
-  sinatra (~> 1.3.5)
+  sinatra (~> 2.2.3)
 
 BUNDLED WITH
    1.10.6