diff --git a/Gemfile.lock b/Gemfile.lock
index c9590b3..0ee7030 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,7 +1,10 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    ast (2.4.2)
     ffi (1.15.5)
+    json (2.7.1)
+    language_server-protocol (3.17.0.3)
     listen (3.8.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
@@ -9,16 +12,40 @@ GEM
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.9)
+    parallel (1.23.0)
+    parser (3.2.2.4)
+      ast (~> 2.4.1)
+      racc
     puma (6.3.0)
       nio4r (~> 2.0)
+    racc (1.7.3)
     rack (2.2.7)
     rack-protection (3.0.6)
       rack
+    rainbow (3.1.1)
     rb-fsevent (0.11.2)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
+    regexp_parser (2.8.3)
     rerun (0.14.0)
       listen (~> 3.0)
+    rexml (3.2.6)
+    rubocop (1.58.0)
+      json (~> 2.3)
+      language_server-protocol (>= 3.17.0)
+      parallel (~> 1.10)
+      parser (>= 3.2.2.4)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.30.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
+    rubocop-sequel (0.3.4)
+      rubocop (~> 1.0)
+    ruby-progressbar (1.13.0)
     ruby2_keywords (0.0.5)
     sequel (5.70.0)
     sinatra (3.0.6)
@@ -34,6 +61,7 @@ GEM
       tilt (~> 2.0)
     sqlite3 (1.6.3-x86_64-linux)
     tilt (2.2.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   x86_64-linux
@@ -41,6 +69,8 @@ PLATFORMS
 DEPENDENCIES
   puma (~> 6.3)
   rerun
+  rubocop
+  rubocop-sequel
   sequel (~> 5.70)
   sinatra (~> 3.0)
   sinatra-contrib (~> 3.0)
diff --git a/Rakefile b/Rakefile
index a7f4ca0..908ef11 100644
--- a/Rakefile
+++ b/Rakefile
@@ -25,7 +25,7 @@ end
 
 namespace :test do
   task :rubocop do
-    system("rubocop app/ server.rb scan.rb")
+    system("rubocop src/")
   end
 end