diff --git a/Gemfile.lock b/Gemfile.lock
index b022d90..1e15695 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -29,7 +29,6 @@ GEM
       public_suffix (>= 2.0.2, < 4.0)
     arel (9.0.0)
     ast (2.4.0)
-    backports (3.15.0)
     builder (3.2.3)
     bundler-audit (0.6.1)
       bundler (>= 1.2.0, < 3)
@@ -104,7 +103,8 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     multi_json (1.13.1)
-    mustermann (1.0.3)
+    mustermann (2.0.2)
+      ruby2_keywords (~> 0.0.1)
     nio4r (2.4.0)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
@@ -119,8 +119,8 @@ GEM
     public_suffix (3.1.1)
     puma (4.0.1)
       nio4r (~> 2.0)
-    rack (2.0.7)
-    rack-protection (2.0.5)
+    rack (2.2.4)
+    rack-protection (2.2.3)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -165,6 +165,7 @@ GEM
     rubocop-performance (1.4.0)
       rubocop (>= 0.71.0)
     ruby-progressbar (1.10.1)
+    ruby2_keywords (0.0.5)
     shoulda (3.6.0)
       shoulda-context (~> 1.0, >= 1.0.1)
       shoulda-matchers (~> 3.0)
@@ -176,18 +177,17 @@ GEM
       json (>= 1.8, < 3)
       simplecov-html (~> 0.10.0)
     simplecov-html (0.10.2)
-    sinatra (2.0.5)
-      mustermann (~> 1.0)
-      rack (~> 2.0)
-      rack-protection (= 2.0.5)
+    sinatra (2.2.3)
+      mustermann (~> 2.0)
+      rack (~> 2.2)
+      rack-protection (= 2.2.3)
       tilt (~> 2.0)
-    sinatra-contrib (2.0.5)
-      backports (>= 2.8.2)
+    sinatra-contrib (2.2.3)
       multi_json
-      mustermann (~> 1.0)
-      rack-protection (= 2.0.5)
-      sinatra (= 2.0.5)
-      tilt (>= 1.3, < 3)
+      mustermann (~> 2.0)
+      rack-protection (= 2.2.3)
+      sinatra (= 2.2.3)
+      tilt (~> 2.0)
     sinatra-flash (0.3.0)
       sinatra (>= 1.0.0)
     standalone_migrations (5.2.7)
@@ -201,7 +201,7 @@ GEM
     strings-ansi (0.1.0)
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.9)
+    tilt (2.0.11)
     tty-color (0.5.0)
     tty-pager (0.12.1)
       strings (~> 0.1.4)