diff --git a/Gemfile.lock b/Gemfile.lock
index 26c248e..06759e5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,10 +2,12 @@ GEM
   remote: https://rubygems.org/
   specs:
     ast (2.4.2)
+    base64 (0.2.0)
     coderay (1.1.3)
     diff-lcs (1.4.4)
+    logger (1.6.1)
     method_source (1.0.0)
-    mustermann (2.0.2)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     parallel (1.20.1)
     parser (3.0.2.0)
@@ -13,9 +15,13 @@ GEM
     pry (0.14.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    rack (2.2.8.1)
-    rack-protection (2.2.3)
-      rack
+    rack (3.1.8)
+    rack-protection (4.1.0)
+      base64 (>= 0.1.0)
+      logger (>= 1.6.0)
+      rack (>= 3.0.0, < 4)
+    rack-session (2.0.0)
+      rack (>= 3.0.0)
     rainbow (3.0.0)
     regexp_parser (2.1.1)
     rexml (3.3.9)
@@ -45,12 +51,14 @@ GEM
       parser (>= 3.0.1.1)
     ruby-progressbar (1.11.0)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.3)
-      mustermann (~> 2.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.3)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    tilt (2.0.11)
+    tilt (2.4.0)
     unicode-display_width (2.0.0)
     webrick (1.8.2)