diff --git a/Gemfile.lock b/Gemfile.lock
index 407cc6d96..fa8fe7167 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -11,6 +11,7 @@ GEM
       childprocess (>= 0.3.6)
       cucumber (>= 1.1.1)
       rspec-expectations (>= 2.7.0)
+    base64 (0.2.0)
     builder (3.2.2)
     childprocess (0.3.9)
       ffi (~> 1.0, >= 1.0.11)
@@ -27,11 +28,18 @@ GEM
       multi_json (~> 1.3)
     hpricot (0.8.6)
     json (1.8.0)
+    logger (1.6.1)
     multi_json (1.8.0)
     mustache (0.99.4)
-    rack (1.5.2)
-    rack-protection (1.5.0)
-      rack
+    mustermann (3.0.3)
+      ruby2_keywords (~> 0.0.1)
+    rack (3.1.8)
+    rack-protection (4.1.0)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rake (10.1.0)
     rdiscount (2.1.6)
     ronn (0.7.3)
@@ -40,12 +48,16 @@ GEM
       rdiscount (>= 1.5.8)
     rspec-expectations (2.14.3)
       diff-lcs (>= 1.1.3, < 2.0)
+    ruby2_keywords (0.0.5)
     safe_yaml (0.9.7)
-    sinatra (1.4.3)
-      rack (~> 1.4)
-      rack-protection (~> 1.4)
-      tilt (~> 1.3, >= 1.3.4)
-    tilt (1.4.1)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.0)
+      rack-session (>= 2.0.0, < 3)
+      tilt (~> 2.0)
+    tilt (2.4.0)
     webmock (1.14.0)
       addressable (>= 2.2.7)
       crack (>= 0.3.2)
diff --git a/vendor/cache/base64-0.2.0.gem b/vendor/cache/base64-0.2.0.gem
new file mode 100644
index 000000000..a45f09b73
Binary files /dev/null and b/vendor/cache/base64-0.2.0.gem differ
diff --git a/vendor/cache/logger-1.6.1.gem b/vendor/cache/logger-1.6.1.gem
new file mode 100644
index 000000000..d7a5aaa39
Binary files /dev/null and b/vendor/cache/logger-1.6.1.gem differ
diff --git a/vendor/cache/mustermann-3.0.3.gem b/vendor/cache/mustermann-3.0.3.gem
new file mode 100644
index 000000000..ec4d12604
Binary files /dev/null and b/vendor/cache/mustermann-3.0.3.gem differ
diff --git a/vendor/cache/rack-1.5.2.gem b/vendor/cache/rack-1.5.2.gem
deleted file mode 100644
index e1f7bfdaf..000000000
Binary files a/vendor/cache/rack-1.5.2.gem and /dev/null differ
diff --git a/vendor/cache/rack-3.1.8.gem b/vendor/cache/rack-3.1.8.gem
new file mode 100644
index 000000000..0cf2f3381
Binary files /dev/null and b/vendor/cache/rack-3.1.8.gem differ
diff --git a/vendor/cache/rack-protection-1.5.0.gem b/vendor/cache/rack-protection-1.5.0.gem
deleted file mode 100644
index 9b47a9c08..000000000
Binary files a/vendor/cache/rack-protection-1.5.0.gem and /dev/null differ
diff --git a/vendor/cache/rack-protection-4.1.0.gem b/vendor/cache/rack-protection-4.1.0.gem
new file mode 100644
index 000000000..12e21ef7d
Binary files /dev/null and b/vendor/cache/rack-protection-4.1.0.gem differ
diff --git a/vendor/cache/rack-session-2.0.0.gem b/vendor/cache/rack-session-2.0.0.gem
new file mode 100644
index 000000000..93a5392d3
Binary files /dev/null and b/vendor/cache/rack-session-2.0.0.gem differ
diff --git a/vendor/cache/ruby2_keywords-0.0.5.gem b/vendor/cache/ruby2_keywords-0.0.5.gem
new file mode 100644
index 000000000..d311c5d0f
Binary files /dev/null and b/vendor/cache/ruby2_keywords-0.0.5.gem differ
diff --git a/vendor/cache/sinatra-1.4.3.gem b/vendor/cache/sinatra-1.4.3.gem
deleted file mode 100644
index 5014028ac..000000000
Binary files a/vendor/cache/sinatra-1.4.3.gem and /dev/null differ
diff --git a/vendor/cache/sinatra-4.1.0.gem b/vendor/cache/sinatra-4.1.0.gem
new file mode 100644
index 000000000..5cc71e7a8
Binary files /dev/null and b/vendor/cache/sinatra-4.1.0.gem differ
diff --git a/vendor/cache/tilt-1.4.1.gem b/vendor/cache/tilt-1.4.1.gem
deleted file mode 100644
index 3ad79a9b3..000000000
Binary files a/vendor/cache/tilt-1.4.1.gem and /dev/null differ
diff --git a/vendor/cache/tilt-2.4.0.gem b/vendor/cache/tilt-2.4.0.gem
new file mode 100644
index 000000000..1a7558721
Binary files /dev/null and b/vendor/cache/tilt-2.4.0.gem differ