diff --git a/.gitignore b/.gitignore
index 717acb7..c093daf 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 # rspec failure tracking
 .rspec_status
 Gemfile.lock
+.gem_rbs_collection
diff --git a/rbs_collection.lock.yaml b/rbs_collection.lock.yaml
new file mode 100644
index 0000000..6f0c308
--- /dev/null
+++ b/rbs_collection.lock.yaml
@@ -0,0 +1,196 @@
+---
+path: ".gem_rbs_collection"
+gems:
+- name: activesupport
+  version: '6.0'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: ast
+  version: '2.4'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: binding_of_caller
+  version: '1.0'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: concurrent-ruby
+  version: '1.1'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: date
+  version: '0'
+  source:
+    type: stdlib
+- name: dbm
+  version: '0'
+  source:
+    type: stdlib
+- name: diff-lcs
+  version: '1.5'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: erb
+  version: '0'
+  source:
+    type: stdlib
+- name: fileutils
+  version: '0'
+  source:
+    type: stdlib
+- name: i18n
+  version: '1.10'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: json
+  version: '0'
+  source:
+    type: stdlib
+- name: logger
+  version: '0'
+  source:
+    type: stdlib
+- name: minitest
+  version: '0'
+  source:
+    type: stdlib
+- name: monitor
+  version: '0'
+  source:
+    type: stdlib
+- name: mutex_m
+  version: '0'
+  source:
+    type: stdlib
+- name: open-uri
+  version: '0'
+  source:
+    type: stdlib
+- name: parallel
+  version: '1.20'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: parser
+  version: '3.2'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: pathname
+  version: '0'
+  source:
+    type: stdlib
+- name: pstore
+  version: '0'
+  source:
+    type: stdlib
+- name: psych
+  version: '0'
+  source:
+    type: stdlib
+- name: rainbow
+  version: '3.0'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: rake
+  version: '13.0'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: regexp_parser
+  version: '2.8'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: rspec-parameterized-core
+  version: 1.0.0
+  source:
+    type: rubygems
+- name: rspec-parameterized-table_syntax
+  version: 1.0.1
+  source:
+    type: rubygems
+- name: rubocop
+  version: '1.57'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: rubocop-ast
+  version: '1.30'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: securerandom
+  version: '0'
+  source:
+    type: stdlib
+- name: simplecov
+  version: '0.22'
+  source:
+    type: git
+    name: ruby/gem_rbs_collection
+    revision: 823e015090cd291d53c4f9d9d7e76b931a6cc75d
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    repo_dir: gems
+- name: singleton
+  version: '0'
+  source:
+    type: stdlib
+- name: tempfile
+  version: '0'
+  source:
+    type: stdlib
+- name: time
+  version: '0'
+  source:
+    type: stdlib
+- name: uri
+  version: '0'
+  source:
+    type: stdlib
+gemfile_lock_path: Gemfile.lock
diff --git a/rbs_collection.yaml b/rbs_collection.yaml
new file mode 100644
index 0000000..4ab0eb9
--- /dev/null
+++ b/rbs_collection.yaml
@@ -0,0 +1,21 @@
+# Download sources
+sources:
+  - type: git
+    name: ruby/gem_rbs_collection
+    remote: https://github.com/ruby/gem_rbs_collection.git
+    revision: main
+    repo_dir: gems
+
+# You can specify local directories as sources also.
+# - type: local
+#   path: path/to/your/local/repository
+
+# A directory to install the downloaded RBSs
+path: .gem_rbs_collection
+
+gems:
+  - name: steep
+    ignore: true
+  - name: uri
+  - name: psych
+  - name: open-uri
diff --git a/sig/types.rbs b/sig/types.rbs
index 791acb4..4e3d596 100644
--- a/sig/types.rbs
+++ b/sig/types.rbs
@@ -1,6 +1,5 @@
 module OpenURI
   module OpenRead
-    def open: () -> (IO | nil)
     def path: () -> String
     def scheme: () -> String
   end
@@ -8,6 +7,6 @@ end
 
 
 module Psych
-  def self.safe_load: (untyped content, untyped parmitted_classes) -> Hash[bot, bot]
+  def self.safe_load: (untyped content, untyped parmitted_classes) -> Hash[bot, bot] | ...
 end