diff --git a/Gemfile.lock b/Gemfile.lock
index 8505b39..4bd9bea 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -10,11 +10,12 @@ GEM
     mime-types-data (3.2019.0331)
     mini_portile2 (2.4.0)
     multipart-post (2.1.1)
-    mustermann (1.0.3)
+    mustermann (3.0.0)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
-    rack (2.0.7)
-    rack-protection (2.0.5)
+    rack (2.2.6.4)
+    rack-protection (3.0.6)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -31,12 +32,13 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.8.0)
     rspec-support (3.8.2)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    ruby2_keywords (0.0.5)
+    sinatra (3.0.6)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.6)
       tilt (~> 2.0)
-    tilt (2.0.9)
+    tilt (2.1.0)
     twilio-ruby (5.25.1)
       faraday (~> 0.9)
       jwt (>= 1.5, <= 2.5)