diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2dd362611..5c245abec 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 - Stabilize npm publishing with isolated temp publish directories instead of mutating tracked package manifests in CI
 - Strip build-time scripts and dev dependencies from generated publish manifests so tarballs pack from verified artifacts only
 - Fix `@open-pencil/mcp` release packaging so the published npm tarball includes its built `dist/` CLI and server entrypoints deterministically
+- Fix `@open-pencil/core` release build configuration so CI publish jobs include Node and Bun ambient types when compiling package artifacts
 
 ## 0.11.1 — 2026-03-30
 
diff --git a/packages/core/tsconfig.json b/packages/core/tsconfig.json
index 9a2b33906..11da7de6c 100644
--- a/packages/core/tsconfig.json
+++ b/packages/core/tsconfig.json
@@ -4,6 +4,7 @@
     "lib": ["ESNext", "DOM"],
     "module": "ESNext",
     "moduleResolution": "bundler",
+    "types": ["node", "bun"],
 
     "strict": true,
     "skipLibCheck": true,