diff --git a/Gemfile.lock b/Gemfile.lock
index d093a50..6c033a2 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ GEM
       thrift
     json (2.6.3)
     mini_portile2 (2.8.0)
-    mustermann (1.1.1)
+    mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
     nokogiri (1.13.6)
@@ -18,23 +18,23 @@ GEM
     puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.6.0)
-    rack (2.2.3)
+    rack (2.2.8)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
-    rack-protection (2.2.0)
-      rack
+    rack-protection (3.1.0)
+      rack (~> 2.2, >= 2.2.4)
     rack-tracer (0.9.0)
       opentracing (~> 0.4)
     ruby2_keywords (0.0.5)
     shotgun (0.9.2)
       rack (>= 1.0)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (3.1.0)
+      mustermann (~> 3.0)
+      rack (~> 2.2, >= 2.2.4)
+      rack-protection (= 3.1.0)
       tilt (~> 2.0)
     thrift (0.16.0)
-    tilt (2.0.10)
+    tilt (2.2.0)
 
 PLATFORMS
   powerpc64le-linux