diff --git a/Gemfile b/Gemfile
index fd5b0fe05..541c49abf 100644
--- a/Gemfile
+++ b/Gemfile
@@ -19,10 +19,14 @@ gem "minitest-difftastic", "~> 0.2"
 gem "rake", "~> 13.4"
 gem "rake-compiler", "~> 1.3"
 gem "rake-compiler-dock", "~> 1.12"
+gem "rbs", "~> 4.1"
 gem "rbs-inline", "~> 0.14"
 gem "reactionview", "~> 0.3.0"
 gem "reline", "~> 0.6"
 gem "rubocop", "~> 1.71"
 gem "sorbet"
-gem "steep", "~> 2.0"
 gem "turbo-rails", "~> 2.0"
+
+# TODO: remove once https://github.com/soutaro/steep/pull/2255 ships
+# gem "steep", "~> 2.0"
+gem "steep", github: "marcoroth/steep", branch: "enum-self-type"
diff --git a/Gemfile.lock b/Gemfile.lock
index dd2ab2a6a..e44ccd8e9 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,3 +1,25 @@
+GIT
+  remote: https://github.com/marcoroth/steep.git
+  revision: 4f663b53b04c241245fa4e5db9565be0a8665e70
+  branch: enum-self-type
+  specs:
+    steep (2.1.0.dev)
+      concurrent-ruby (>= 1.1.10)
+      csv (>= 3.0.9)
+      fileutils (>= 1.1.0)
+      json (>= 2.1.0)
+      language_server-protocol (>= 3.17.0.4, < 4.0)
+      listen (~> 3.0)
+      logger (>= 1.3.0)
+      parser (>= 3.2)
+      prism (>= 0.25.0)
+      rainbow (>= 2.2.2, < 4.0)
+      rbs (~> 4.0)
+      securerandom (>= 0.1)
+      strscan (>= 1.0.0)
+      terminal-table (>= 2, < 5)
+      uri (>= 0.12.0)
+
 GIT
   remote: https://github.com/ruby/prism.git
   revision: c0e37816e97e23e92524a4070e1b99a4025bc63f
@@ -215,7 +237,7 @@ GEM
     rb-fsevent (0.11.2)
     rb-inotify (0.11.1)
       ffi (~> 1.0)
-    rbs (4.0.2)
+    rbs (4.1.2)
       logger
       prism (>= 1.6.0)
       tsort
@@ -253,22 +275,6 @@ GEM
     sorbet-static (0.6.13367-aarch64-linux)
     sorbet-static (0.6.13367-universal-darwin)
     sorbet-static (0.6.13367-x86_64-linux)
-    steep (2.0.0)
-      concurrent-ruby (>= 1.1.10)
-      csv (>= 3.0.9)
-      fileutils (>= 1.1.0)
-      json (>= 2.1.0)
-      language_server-protocol (>= 3.17.0.4, < 4.0)
-      listen (~> 3.0)
-      logger (>= 1.3.0)
-      parser (>= 3.2)
-      prism (>= 0.25.0)
-      rainbow (>= 2.2.2, < 4.0)
-      rbs (~> 4.0)
-      securerandom (>= 0.1)
-      strscan (>= 1.0.0)
-      terminal-table (>= 2, < 5)
-      uri (>= 0.12.0)
     stringio (3.2.0)
     strscan (3.1.7)
     terminal-table (4.0.0)
@@ -314,12 +320,13 @@ DEPENDENCIES
   rake (~> 13.4)
   rake-compiler (~> 1.3)
   rake-compiler-dock (~> 1.12)
+  rbs (~> 4.1)
   rbs-inline (~> 0.14)
   reactionview (~> 0.3.0)
   reline (~> 0.6)
   rubocop (~> 1.71)
   sorbet
-  steep (~> 2.0)
+  steep!
   turbo-rails (~> 2.0)
 
 BUNDLED WITH
diff --git a/rbs_collection.lock.yaml b/rbs_collection.lock.yaml
index f828f4c3e..1938c2475 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: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: actionview
@@ -14,7 +14,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: activesupport
@@ -22,7 +22,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: ast
@@ -30,7 +30,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: base64
@@ -58,7 +58,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: charm
@@ -70,7 +70,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: connection_pool
@@ -78,22 +78,14 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
-    remote: https://github.com/ruby/gem_rbs_collection.git
-    repo_dir: gems
-- name: csv
-  version: '3.3'
-  source:
-    type: git
-    name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: date
   version: '0'
   source:
     type: stdlib
-- name: dbm
+- name: delegate
   version: '0'
   source:
     type: stdlib
@@ -105,18 +97,10 @@ gems:
   version: '0'
   source:
     type: stdlib
-- name: ffi
-  version: 1.17.3
-  source:
-    type: rubygems
 - name: fileutils
   version: '0'
   source:
     type: stdlib
-- name: forwardable
-  version: '0'
-  source:
-    type: stdlib
 - name: gum
   version: 0.3.2
   source:
@@ -130,7 +114,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: io-console
@@ -146,27 +130,19 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: lipgloss
   version: 0.2.2
   source:
     type: rubygems
-- name: listen
-  version: '3.9'
-  source:
-    type: git
-    name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
-    remote: https://github.com/ruby/gem_rbs_collection.git
-    repo_dir: gems
 - name: logger
   version: '1.7'
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: minitest
@@ -174,7 +150,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: minitest-difftastic
@@ -190,7 +166,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: openssl
@@ -206,7 +182,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: parser
@@ -214,7 +190,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: pp
@@ -229,24 +205,12 @@ gems:
   version: 1.9.0
   source:
     type: rubygems
-- name: pstore
-  version: '0.2'
-  source:
-    type: git
-    name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
-    remote: https://github.com/ruby/gem_rbs_collection.git
-    repo_dir: gems
-- name: psych
-  version: '0'
-  source:
-    type: stdlib
 - name: rack
   version: '2.2'
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rails-dom-testing
@@ -254,7 +218,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rails-html-sanitizer
@@ -262,7 +226,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: railties
@@ -270,7 +234,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rainbow
@@ -278,7 +242,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rake
@@ -286,7 +250,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: random-formatter
@@ -294,11 +258,11 @@ gems:
   source:
     type: stdlib
 - name: rbs
-  version: 4.0.2
+  version: 4.1.2
   source:
     type: rubygems
 - name: rbs-inline
-  version: 0.13.0
+  version: 0.14.0
   source:
     type: rubygems
 - name: rdoc
@@ -314,7 +278,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rubocop
@@ -322,7 +286,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: rubocop-ast
@@ -330,7 +294,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: securerandom
@@ -362,7 +326,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: time
@@ -373,6 +337,10 @@ gems:
   version: '0'
   source:
     type: stdlib
+- name: tmpdir
+  version: '0'
+  source:
+    type: stdlib
 - name: tsort
   version: '0'
   source:
@@ -382,7 +350,7 @@ gems:
   source:
     type: git
     name: ruby/gem_rbs_collection
-    revision: 81fa8bd0617286078617a62b6a3229cebfd4af23
+    revision: 82762423fc5694b82888ea89a972847cf19838c2
     remote: https://github.com/ruby/gem_rbs_collection.git
     repo_dir: gems
 - name: uri
diff --git a/rbs_collection.yaml b/rbs_collection.yaml
index fddd2147b..28439d7fd 100644
--- a/rbs_collection.yaml
+++ b/rbs_collection.yaml
@@ -1,4 +1,3 @@
-# Download sources
 sources:
   - type: git
     name: ruby/gem_rbs_collection
@@ -6,13 +5,13 @@ sources:
     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: herb
     ignore: true
+
+  - name: steep
+    ignore: true
+
+  - name: strscan