diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8875c4b5a..1cd628717 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,20 @@
+# [5.0.0-next.1](https://github.com/streamich/memfs/compare/v4.9.1...v5.0.0-next.1) (2024-04-29)
+
+
+### Bug Fixes
+
+* inline `thingies` ([#1001](https://github.com/streamich/memfs/issues/1001)) ([ed265f0](https://github.com/streamich/memfs/commit/ed265f0212b09f04ffbef9430f4f863f0cfc7674))
+
+
+### chore
+
+* 🤖 update build target and don't emit sourcemaps ([9d9bd01](https://github.com/streamich/memfs/commit/9d9bd0159de763b032066d99358a099c0825e2d2))
+
+
+### BREAKING CHANGES
+
+* 🧨 Build target was bumped to ES2020
+
 ## [4.9.1](https://github.com/streamich/memfs/compare/v4.9.0...v4.9.1) (2024-04-27)
 
 
diff --git a/package.json b/package.json
index 4f2b2e22a..5890e4144 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "memfs",
-  "version": "4.9.1",
+  "version": "5.0.0-next.1",
   "description": "In-memory file-system with Node's fs API.",
   "keywords": [
     "fs",
diff --git a/tsconfig.json b/tsconfig.json
index 00dda587a..cdc066e93 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,12 +1,12 @@
 {
   "compilerOptions": {
-    "target": "es2017",
+    "target": "es2020",
     "lib": ["ES2017", "dom"],
     "module": "commonjs",
     "removeComments": false,
     "noImplicitAny": false,
     "strictNullChecks": true,
-    "sourceMap": true,
+    "sourceMap": false,
     "outDir": "lib",
     "declaration": true,
     "skipLibCheck": true,