diff --git a/Gemfile.lock b/Gemfile.lock
index f222e07..507f37a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -136,7 +136,7 @@ GEM
     minitest (5.15.0)
     msgpack (1.4.5)
     multipart-post (2.1.1)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     net-imap (0.2.3)
       digest
@@ -162,8 +162,8 @@ GEM
     puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.1)
-    rack (2.2.3.1)
-    rack-protection (2.2.0)
+    rack (2.2.5)
+    rack-protection (3.0.5)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -241,10 +241,10 @@ GEM
       sinatra
     ruby_event_store-rspec (2.3.0)
       rspec (~> 3.0)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.0.5)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.0.5)
       tilt (~> 2.0)
     slack-ruby-client (1.0.0)
       faraday (>= 1.0)
@@ -262,7 +262,7 @@ GEM
     strscan (3.0.1)
     thor (1.2.1)
     thread_safe (0.3.6)
-    tilt (2.0.10)
+    tilt (2.0.11)
     timeout (0.2.0)
     tzinfo (2.0.4)
       concurrent-ruby (~> 1.0)