diff --git a/chapter_01/Gemfile.lock b/chapter_01/Gemfile.lock
index 99375d3..c99231b 100644
--- a/chapter_01/Gemfile.lock
+++ b/chapter_01/Gemfile.lock
@@ -20,8 +20,10 @@ GEM
     json (1.7.3)
     mime-types (1.19)
     multi_json (1.3.6)
-    rack (1.4.1)
-    rack-protection (1.2.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
     rack-test (0.6.1)
       rack (>= 1.0)
@@ -33,12 +35,14 @@ GEM
     rspec-expectations (2.10.0)
       diff-lcs (~> 1.1.3)
     rspec-mocks (2.10.1)
-    sinatra (1.3.2)
-      rack (~> 1.3, >= 1.3.6)
-      rack-protection (~> 1.2)
-      tilt (~> 1.3, >= 1.3.3)
+    ruby2_keywords (0.0.5)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     sqlite3 (1.3.6)
-    tilt (1.3.3)
+    tilt (2.0.10)
     typhoeus (0.4.2)
       ffi (~> 1.0)
       mime-types (~> 1.18)