diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5006fac10..c66d9542d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,20 @@
 # CHANGELOG
 
+## 4.2.1.pre.1 (2026-08-26)
+
+### Library changes
+
+* Remove some obsolete ruby version guards ([#3100](https://github.com/ruby/rbs/pull/3100))
+
+#### rbs collection
+
+* Make `rbs collection` say where the gem list comes from ([#3094](https://github.com/ruby/rbs/pull/3094))
+
+### Miscellaneous
+
+* Run `bundle` with the Ruby running the tests ([#3099](https://github.com/ruby/rbs/pull/3099))
+* docs: fix typo prefered -> preferred ([#3098](https://github.com/ruby/rbs/pull/3098))
+
 ## 4.2.0 (2026-08-23)
 
 RBS 4.2 accepts non-ASCII characters in identifiers. Method names, instance variable names and parameter names can be written in any script, and other names may contain non-ASCII characters as long as they start with an ASCII letter, which is what tells a constant from a method name.
diff --git a/Gemfile.lock b/Gemfile.lock
index 2644afa6c..501e57c3c 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,7 +22,7 @@ GIT
 PATH
   remote: .
   specs:
-    rbs (4.2.0)
+    rbs (4.2.1.pre.1)
       logger
       prism (>= 1.6.0)
       tsort
diff --git a/lib/rbs/version.rb b/lib/rbs/version.rb
index 2ff67a9ce..789e4f281 100644
--- a/lib/rbs/version.rb
+++ b/lib/rbs/version.rb
@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module RBS
-  VERSION = "4.2.0"
+  VERSION = "4.2.1.pre.1"
 end