diff --git a/api/ruby/basics-of-authentication/Gemfile b/api/ruby/basics-of-authentication/Gemfile
index 4f35dd6b0..1c155beae 100644
--- a/api/ruby/basics-of-authentication/Gemfile
+++ b/api/ruby/basics-of-authentication/Gemfile
@@ -1,4 +1,4 @@
 source "http://rubygems.org"
 
-gem 'sinatra',     '~> 1.3.5'
+gem 'sinatra', '~> 2.0.0'
 gem 'rest-client', '~> 1.8.0'
diff --git a/api/ruby/basics-of-authentication/Gemfile.lock b/api/ruby/basics-of-authentication/Gemfile.lock
index 9303b5c71..5509e66ea 100644
--- a/api/ruby/basics-of-authentication/Gemfile.lock
+++ b/api/ruby/basics-of-authentication/Gemfile.lock
@@ -6,19 +6,23 @@ GEM
     http-cookie (1.0.3)
       domain_name (~> 0.5)
     mime-types (2.99.3)
+    mustermann (1.1.2)
+      ruby2_keywords (~> 0.0.1)
     netrc (0.11.0)
-    rack (1.6.13)
-    rack-protection (1.3.2)
+    rack (2.2.9)
+    rack-protection (2.0.8.1)
       rack
     rest-client (1.8.0)
       http-cookie (>= 1.0.2, < 2.0)
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
-    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 (2.0.8.1)
+      mustermann (~> 1.0)
+      rack (~> 2.0)
+      rack-protection (= 2.0.8.1)
+      tilt (~> 2.0)
+    tilt (2.3.0)
     unf (0.1.4)
       unf_ext
     unf_ext (0.0.7.6)
@@ -28,7 +32,7 @@ PLATFORMS
 
 DEPENDENCIES
   rest-client (~> 1.8.0)
-  sinatra (~> 1.3.5)
+  sinatra (~> 2.0.0)
 
 BUNDLED WITH
-   1.17.2
+   1.17.3