diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 579ae9f..f1c1e58 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.4.7"
+  ".": "0.5.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fd30831..2b69ae4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,19 @@
 # Changelog
 
+## 0.5.0 (2026-04-28)
+
+Full Changelog: [v0.4.7...v0.5.0](https://github.com/anthalehq/anthale-node/compare/v0.4.7...v0.5.0)
+
+### Features
+
+* support setting headers via env ([26769d0](https://github.com/anthalehq/anthale-node/commit/26769d08105f6e560c8bc0f63f4e028a3bcc0d54))
+
+
+### Chores
+
+* **internal:** codegen related update ([afdad52](https://github.com/anthalehq/anthale-node/commit/afdad52ac3978b1dd8de18814a56a1f0499e82be))
+* **internal:** more robust bootstrap script ([acaebb6](https://github.com/anthalehq/anthale-node/commit/acaebb60ded9c430bbe61999af1a127a923c18a2))
+
 ## 0.4.7 (2026-04-21)
 
 Full Changelog: [v0.4.6...v0.4.7](https://github.com/anthalehq/anthale-node/compare/v0.4.6...v0.4.7)
diff --git a/package.json b/package.json
index 1f5cbae..11fe950 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "anthale",
-  "version": "0.4.7",
+  "version": "0.5.0",
   "description": "The official TypeScript library for the Anthale API",
   "author": "Anthale <contact@anthale.com>",
   "types": "dist/index.d.ts",
diff --git a/scripts/bootstrap b/scripts/bootstrap
index 2bb3c94..3a8293a 100755
--- a/scripts/bootstrap
+++ b/scripts/bootstrap
@@ -4,7 +4,7 @@ set -e
 
 cd "$(dirname "$0")/.."
 
-if [ -f "Brewfile" ] && [ "$(uname -s)" = "Darwin" ] && [ "$SKIP_BREW" != "1" ] && [ -t 0 ]; then
+if [ -f "Brewfile" ] && [ "$(uname -s)" = "Darwin" ] && [ "${SKIP_BREW:-}" != "1" ] && [ -t 0 ]; then
   brew bundle check >/dev/null 2>&1 || {
     echo -n "==> Install Homebrew dependencies? (y/N): "
     read -r response
diff --git a/scripts/utils/postprocess-files.cjs b/scripts/utils/postprocess-files.cjs
index deae575..a8cdeb7 100644
--- a/scripts/utils/postprocess-files.cjs
+++ b/scripts/utils/postprocess-files.cjs
@@ -23,12 +23,19 @@ async function postprocess() {
 
     // strip out lib="dom", types="node", and types="react" references; these
     // are needed at build time, but would pollute the user's TS environment
-    const transformed = code.replace(
+    let transformed = code.replace(
       /^ *\/\/\/ *<reference +(lib="dom"|types="(node|react)").*?\n/gm,
       // replace with same number of characters to avoid breaking source maps
       (match) => ' '.repeat(match.length - 1) + '\n',
     );
 
+    // TypeScript's declaration emitter collapses /** @ts-ignore */ onto the same
+    // line as the type declaration, which doesn't work. So we convert to // @ts-ignore
+    // on its own line to properly suppresses errors.
+    if (file.endsWith('.d.ts') || file.endsWith('.d.mts') || file.endsWith('.d.cts')) {
+      transformed = transformed.replace(/\/\*\* @ts-ignore\b[^*]*\*\/ /gm, '// @ts-ignore\n');
+    }
+
     if (transformed !== code) {
       console.error(`wrote ${path.relative(process.cwd(), file)}`);
       await fs.promises.writeFile(file, transformed, 'utf8');
diff --git a/src/client.ts b/src/client.ts
index b2e2e34..e343259 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -168,6 +168,18 @@ export class Anthale {
     this.fetch = options.fetch ?? Shims.getDefaultFetch();
     this.#encoder = Opts.FallbackEncoder;
 
+    const customHeadersEnv = readEnv('ANTHALE_CUSTOM_HEADERS');
+    if (customHeadersEnv) {
+      const parsed: Record<string, string> = {};
+      for (const line of customHeadersEnv.split('\n')) {
+        const colon = line.indexOf(':');
+        if (colon >= 0) {
+          parsed[line.substring(0, colon).trim()] = line.substring(colon + 1).trim();
+        }
+      }
+      options.defaultHeaders = { ...parsed, ...options.defaultHeaders };
+    }
+
     this._options = options;
 
     this.apiKey = apiKey;
diff --git a/src/version.ts b/src/version.ts
index 543c3a7..1f5d158 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '0.4.7'; // x-release-please-version
+export const VERSION = '0.5.0'; // x-release-please-version