diff --git a/Gemfile.lock b/Gemfile.lock
index 2e6511f..1cf972b 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -33,8 +33,8 @@ GEM
     csv (3.3.0)
     diff-lcs (1.5.1)
     drb (2.2.1)
-    ffi (1.17.0)
-    ffi (1.17.0-x86_64-linux-gnu)
+    ffi (1.17.1)
+    ffi (1.17.1-x86_64-linux-gnu)
     fileutils (1.7.2)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
@@ -43,7 +43,7 @@ GEM
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.6.2)
+    logger (1.6.4)
     mini_mime (1.1.5)
     minitest (5.25.1)
     net-http (0.6.0)
@@ -60,7 +60,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (3.7.0)
+    rbs (3.8.1)
       logger
     rspec (3.13.0)
       rspec-core (~> 3.13.0)
@@ -77,7 +77,7 @@ GEM
     rspec-support (3.13.1)
     securerandom (0.3.1)
     singleton (0.3.0)
-    steep (1.9.0)
+    steep (1.9.3)
       activesupport (>= 5.1)
       concurrent-ruby (>= 1.1.10)
       csv (>= 3.0.9)
@@ -88,10 +88,11 @@ GEM
       logger (>= 1.3.0)
       parser (>= 3.1)
       rainbow (>= 2.2.2, < 4.0)
-      rbs (~> 3.7.0)
+      rbs (~> 3.8)
       securerandom (>= 0.1)
       strscan (>= 1.0.0)
       terminal-table (>= 2, < 4)
+      uri (>= 0.12.0)
     strscan (3.1.0)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
diff --git a/rbs_collection.lock.yaml b/rbs_collection.lock.yaml
index 1e32931..8459a9e 100644
--- a/rbs_collection.lock.yaml
+++ b/rbs_collection.lock.yaml
@@ -6,7 +6,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: ast
@@ -14,13 +14,17 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: base64
   version: '0'
   source:
     type: stdlib
+- name: benchmark
+  version: '0'
+  source:
+    type: stdlib
 - name: bigdecimal
   version: '0'
   source:
@@ -34,7 +38,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: connection_pool
@@ -42,7 +46,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: csv
@@ -58,9 +62,13 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
+- name: digest
+  version: '0'
+  source:
+    type: stdlib
 - name: erb
   version: '0'
   source:
@@ -78,7 +86,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: json
@@ -90,7 +98,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: logger
@@ -102,7 +110,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: minitest
@@ -114,9 +122,9 @@ gems:
   source:
     type: stdlib
 - name: mutex_m
-  version: '0'
+  version: 0.3.0
   source:
-    type: stdlib
+    type: rubygems
 - name: net-http
   version: '0'
   source:
@@ -125,6 +133,10 @@ gems:
   version: '0'
   source:
     type: stdlib
+- name: openssl
+  version: '0'
+  source:
+    type: stdlib
 - name: optparse
   version: '0'
   source:
@@ -134,7 +146,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: pathname
@@ -146,7 +158,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rainbow
@@ -154,7 +166,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rake
@@ -162,11 +174,11 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rbs
-  version: 3.6.1
+  version: 3.8.1
   source:
     type: rubygems
 - name: rdoc
@@ -181,6 +193,14 @@ gems:
   version: '0'
   source:
     type: stdlib
+- name: socket
+  version: '0'
+  source:
+    type: stdlib
+- name: stringio
+  version: '0'
+  source:
+    type: stdlib
 - name: strscan
   version: '0'
   source:
@@ -206,11 +226,15 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: ddba0c60808c22451a194c1b57504fceb4fafd23
+    revision: '09beb2100db10cbf4773ed0e71ddf79280a2f275'
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: uri
   version: '0'
   source:
     type: stdlib
+- name: webrick
+  version: 1.9.1
+  source:
+    type: rubygems
 gemfile_lock_path: Gemfile.lock
diff --git a/sig/fetch/api.rbs b/sig/fetch/api.rbs
index cb93cd3..0b6fa2b 100644
--- a/sig/fetch/api.rbs
+++ b/sig/fetch/api.rbs
@@ -1,5 +1,5 @@
 module Fetch
-  class API
+  module API
     def self?.fetch: (
       string,
       ?method: String | Symbol,