diff --git a/Gemfile.lock b/Gemfile.lock
index b427e6c..6771497 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -13,6 +13,7 @@ GEM
   specs:
     addressable (2.8.5)
       public_suffix (>= 2.0.2, < 6.0)
+    base64 (0.2.0)
     builder (3.2.4)
     coderay (1.1.3)
     commonmarker (1.0.0.pre12-x86_64-linux)
@@ -35,9 +36,12 @@ GEM
     public_suffix (5.0.4)
     puma (6.4.2)
       nio4r (~> 2.0)
-    rack (2.2.8)
-    rack-protection (3.1.0)
-      rack (~> 2.2, >= 2.2.4)
+    rack (3.0.9.1)
+    rack-protection (4.0.0)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rack-test (2.1.0)
       rack (>= 1.3)
     rake (13.1.0)
@@ -49,10 +53,11 @@ GEM
       listen (~> 3.0)
     rexml (3.2.6)
     ruby2_keywords (0.0.5)
-    sinatra (3.1.0)
+    sinatra (4.0.0)
       mustermann (~> 3.0)
-      rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.1.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.0.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
     stupider_formatter (0.3.0)
       coderay (>= 0.9.0)