diff --git a/blog/containerized_sinatra_app/Gemfile.lock b/blog/containerized_sinatra_app/Gemfile.lock
index 7d6ff24..a355a6d 100644
--- a/blog/containerized_sinatra_app/Gemfile.lock
+++ b/blog/containerized_sinatra_app/Gemfile.lock
@@ -58,22 +58,26 @@ GEM
     minitest (5.8.4)
     multi_json (1.11.2)
     multipart-post (2.0.0)
+    mustermann (1.1.1)
+      ruby2_keywords (~> 0.0.1)
     os (0.9.6)
-    rack (1.6.4)
-    rack-protection (1.5.3)
+    rack (2.2.3)
+    rack-protection (2.2.0)
       rack
     retriable (1.4.1)
+    ruby2_keywords (0.0.5)
     signet (0.7.2)
       addressable (~> 2.3)
       faraday (~> 0.9)
       jwt (~> 1.5)
       multi_json (~> 1.10)
-    sinatra (1.4.7)
-      rack (~> 1.5)
-      rack-protection (~> 1.4)
-      tilt (>= 1.3, < 3)
+    sinatra (2.2.0)
+      mustermann (~> 1.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.0)
+      tilt (~> 2.0)
     thread_safe (0.3.5)
-    tilt (2.0.2)
+    tilt (2.0.10)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     zonefile (1.04)