diff --git a/CHANGELOG.md b/CHANGELOG.md
index 78a3a30..9c73c14 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,13 +7,14 @@ The format follows *Keep a Changelog*. Versions use semantic versioning with pre
 ## [v0.4.22] - 2026-02-16
 
 ### Added
-- TODO
+- Added shared syntax-regex compilation cache to reuse `NSRegularExpression` instances across highlight passes on macOS and iOS.
 
 ### Improved
-- TODO
+- Improved large-document editor responsiveness by avoiding full syntax-regex reprocessing on caret-only moves and updating only transient line/bracket/scope decorations.
+- Improved iOS line-number gutter performance by caching line-count driven rendering and avoiding full gutter text rebuilds when the line count is unchanged.
 
 ### Fixed
-- TODO
+- Fixed macOS line-number ruler hot-path overhead by replacing per-draw line-number scans with cached UTF-16 line-start indexing and O(log n) lookup.
 
 ## [v0.4.21] - 2026-02-16
 
diff --git a/Neon Vision Editor.xcodeproj/project.pbxproj b/Neon Vision Editor.xcodeproj/project.pbxproj
index 1d93ca7..7f05c03 100644
--- a/Neon Vision Editor.xcodeproj/project.pbxproj	
+++ b/Neon Vision Editor.xcodeproj/project.pbxproj	
@@ -358,7 +358,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 245;
+				CURRENT_PROJECT_VERSION = 246;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;
@@ -438,7 +438,7 @@
 				CODE_SIGNING_ALLOWED = YES;
 				CODE_SIGN_IDENTITY = "Apple Development";
 				CODE_SIGN_STYLE = Automatic;
-				CURRENT_PROJECT_VERSION = 245;
+				CURRENT_PROJECT_VERSION = 246;
 				DEAD_CODE_STRIPPING = YES;
 				DEVELOPMENT_TEAM = CS727NF72U;
 				ENABLE_APP_SANDBOX = YES;