diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cff688f..6e657fa 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,12 +1,14 @@
 name: CI
 on:
   push:
-    branches-ignore:
-      - 'generated'
-      - 'codegen/**'
-      - 'integrated/**'
-      - 'stl-preview-head/**'
-      - 'stl-preview-base/**'
+    branches:
+      - '**'
+      - '!integrated/**'
+      - '!stl-preview-head/**'
+      - '!stl-preview-base/**'
+      - '!generated'
+      - '!codegen/**'
+      - 'codegen/stl/**'
   pull_request:
     branches-ignore:
       - 'stl-preview-head/**'
@@ -17,12 +19,12 @@ jobs:
     timeout-minutes: 10
     name: lint
     runs-on: ${{ github.repository == 'stainless-sdks/zeroentropy-node' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
-    if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
+    if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: '18'
 
@@ -36,15 +38,15 @@ jobs:
     timeout-minutes: 5
     name: build
     runs-on: ${{ github.repository == 'stainless-sdks/zeroentropy-node' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
-    if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
+    if: (github.event_name == 'push' || github.event.pull_request.head.repo.fork) && (github.event_name != 'push' || github.event.head_commit.message != 'codegen metadata')
     permissions:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: '18'
 
@@ -59,7 +61,7 @@ jobs:
           github.repository == 'stainless-sdks/zeroentropy-node' &&
           !startsWith(github.ref, 'refs/heads/stl/')
         id: github-oidc
-        uses: actions/github-script@v8
+        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
         with:
           script: core.setOutput('github_token', await core.getIDToken());
 
@@ -78,10 +80,10 @@ jobs:
     runs-on: ${{ github.repository == 'stainless-sdks/zeroentropy-node' && 'depot-ubuntu-24.04' || 'ubuntu-latest' }}
     if: github.event_name == 'push' || github.event.pull_request.head.repo.fork
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
         with:
           node-version: '20'
 
diff --git a/.github/workflows/publish-npm.yml b/.github/workflows/publish-npm.yml
index 692b89c..326ca1e 100644
--- a/.github/workflows/publish-npm.yml
+++ b/.github/workflows/publish-npm.yml
@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Set up Node
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@3235b876344d2a9aa001b8d1453c930bba69e610 # v3.9.1
         with:
           node-version: '20'
 
diff --git a/.github/workflows/release-doctor.yml b/.github/workflows/release-doctor.yml
index 55f70f7..3e93a56 100644
--- a/.github/workflows/release-doctor.yml
+++ b/.github/workflows/release-doctor.yml
@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'zeroentropy-ai/zeroentropy-node' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch' || startsWith(github.head_ref, 'release-please') || github.head_ref == 'next')
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       - name: Check release environment
         run: |
diff --git a/.gitignore b/.gitignore
index 2412bb7..c85fe68 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 .prism.log
+.stdy.log
 node_modules
 yarn-error.log
 codegen.log
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 931fce1..acba45e 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.1.0-alpha.10"
+  ".": "0.1.0-alpha.11"
 }
diff --git a/.stats.yml b/.stats.yml
index a9365b5..8a4fe5a 100644
--- a/.stats.yml
+++ b/.stats.yml
@@ -1,4 +1,4 @@
 configured_endpoints: 15
-openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/zeroentropy%2Fzeroentropy-5ff1b24060b908d169910a7366213eeb423b52d14b03cc16902923eb0ffac71a.yml
+openapi_spec_url: https://storage.googleapis.com/stainless-sdk-openapi-specs/zeroentropy/zeroentropy-6d6fee8f2524057cf8e4329638eb7c97e2befc3054e867c6ab0931bea37bc6ec.yml
 openapi_spec_hash: fc50a1765bfbfe9a3da7ea9001e479d4
 config_hash: e56152e1ee1a9273241d925702077e49
diff --git a/CHANGELOG.md b/CHANGELOG.md
index da14712..7ea1491 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,35 @@
 # Changelog
 
+## 0.1.0-alpha.11 (2026-05-13)
+
+Full Changelog: [v0.1.0-alpha.10...v0.1.0-alpha.11](https://github.com/zeroentropy-ai/zeroentropy-node/compare/v0.1.0-alpha.10...v0.1.0-alpha.11)
+
+### Features
+
+* support setting headers via env ([421be8a](https://github.com/zeroentropy-ai/zeroentropy-node/commit/421be8a2da546cdb6360033153bd5bb0ec36285e))
+
+
+### Chores
+
+* **ci:** skip lint on metadata-only changes ([ad14cb8](https://github.com/zeroentropy-ai/zeroentropy-node/commit/ad14cb8b44632f6e9d114b4dee381260241e1eb3))
+* **internal:** codegen related update ([8aae49f](https://github.com/zeroentropy-ai/zeroentropy-node/commit/8aae49f6fe4d41f4d72069b9c855cf0b9290384f))
+* **internal:** more robust bootstrap script ([7eeb4ae](https://github.com/zeroentropy-ai/zeroentropy-node/commit/7eeb4ae68489d5abadf34bbe78a355d4f4897fb6))
+* **internal:** tweak CI branches ([c0e7952](https://github.com/zeroentropy-ai/zeroentropy-node/commit/c0e79524e59cab23ca892fcbdc075923ecd2fb55))
+* **internal:** update gitignore ([56c5654](https://github.com/zeroentropy-ai/zeroentropy-node/commit/56c5654b5d377df0b833fce219b73945d487ee80))
+* **internal:** update multipart form array serialization ([3fcd1df](https://github.com/zeroentropy-ai/zeroentropy-node/commit/3fcd1dfb6f1cf01d0804fb1571ad9b213e68d942))
+* **tests:** bump steady to v0.19.4 ([9e94e5c](https://github.com/zeroentropy-ai/zeroentropy-node/commit/9e94e5c8849deafdaa92e0c5ffd7e19e4efae853))
+* **tests:** bump steady to v0.19.5 ([181566c](https://github.com/zeroentropy-ai/zeroentropy-node/commit/181566c7a3bac0b4c9855c374cbdde0071096833))
+* **tests:** bump steady to v0.19.6 ([291bdf2](https://github.com/zeroentropy-ai/zeroentropy-node/commit/291bdf21202c4e333a08baeffb9d4a31a3a640b5))
+* **tests:** bump steady to v0.19.7 ([124fb21](https://github.com/zeroentropy-ai/zeroentropy-node/commit/124fb21e2a3393814369f270a5b8f807a009b8ec))
+* **tests:** bump steady to v0.20.1 ([bfc164c](https://github.com/zeroentropy-ai/zeroentropy-node/commit/bfc164cc8ba80b93aef0fc90d551bd0b4b38359f))
+* **tests:** bump steady to v0.20.2 ([3131593](https://github.com/zeroentropy-ai/zeroentropy-node/commit/3131593c25c3fdb300e1032d738b32df7b6b5786))
+* **tests:** bump steady to v0.22.1 ([bf20a55](https://github.com/zeroentropy-ai/zeroentropy-node/commit/bf20a558f88afc5ac0dcc350bc40010089e43ce8))
+
+
+### Refactors
+
+* **tests:** switch from prism to steady ([3aa529e](https://github.com/zeroentropy-ai/zeroentropy-node/commit/3aa529ec81bb884439e6e603ddf4e6437496ce8c))
+
 ## 0.1.0-alpha.10 (2026-03-07)
 
 Full Changelog: [v0.1.0-alpha.9...v0.1.0-alpha.10](https://github.com/zeroentropy-ai/zeroentropy-node/compare/v0.1.0-alpha.9...v0.1.0-alpha.10)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 858bf6c..3ee8ec1 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -65,7 +65,7 @@ $ pnpm link --global zeroentropy
 
 ## Running tests
 
-Most tests require you to [set up a mock server](https://github.com/stoplightio/prism) against the OpenAPI spec to run the tests.
+Most tests require you to [set up a mock server](https://github.com/dgellow/steady) against the OpenAPI spec to run the tests.
 
 ```sh
 $ ./scripts/mock
diff --git a/package.json b/package.json
index 7c580b3..a5747ca 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "zeroentropy",
-  "version": "0.1.0-alpha.10",
+  "version": "0.1.0-alpha.11",
   "description": "The official TypeScript library for the ZeroEntropy API",
   "author": "ZeroEntropy <founders@zeroentropy.dev>",
   "types": "dist/index.d.ts",
diff --git a/scripts/bootstrap b/scripts/bootstrap
index f68beda..28b5985 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/mock b/scripts/mock
index bcf3b39..feebe5e 100755
--- a/scripts/mock
+++ b/scripts/mock
@@ -19,34 +19,34 @@ fi
 
 echo "==> Starting mock server with URL ${URL}"
 
-# Run prism mock on the given spec
+# Run steady mock on the given spec
 if [ "$1" == "--daemon" ]; then
   # Pre-install the package so the download doesn't eat into the startup timeout
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism --version
+  npm exec --package=@stdy/cli@0.22.1 -- steady --version
 
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL" &> .prism.log &
+  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL" &> .stdy.log &
 
-  # Wait for server to come online (max 30s)
+  # Wait for server to come online via health endpoint (max 30s)
   echo -n "Waiting for server"
   attempts=0
-  while ! grep -q "✖  fatal\|Prism is listening" ".prism.log" ; do
+  while ! curl --silent --fail "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1; do
+    if ! kill -0 $! 2>/dev/null; then
+      echo
+      cat .stdy.log
+      exit 1
+    fi
     attempts=$((attempts + 1))
     if [ "$attempts" -ge 300 ]; then
       echo
-      echo "Timed out waiting for Prism server to start"
-      cat .prism.log
+      echo "Timed out waiting for Steady server to start"
+      cat .stdy.log
       exit 1
     fi
     echo -n "."
     sleep 0.1
   done
 
-  if grep -q "✖  fatal" ".prism.log"; then
-    cat .prism.log
-    exit 1
-  fi
-
   echo
 else
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL"
+  npm exec --package=@stdy/cli@0.22.1 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL"
 fi
diff --git a/scripts/test b/scripts/test
index 7bce051..19b8d0c 100755
--- a/scripts/test
+++ b/scripts/test
@@ -9,8 +9,8 @@ GREEN='\033[0;32m'
 YELLOW='\033[0;33m'
 NC='\033[0m' # No Color
 
-function prism_is_running() {
-  curl --silent "http://localhost:4010" >/dev/null 2>&1
+function steady_is_running() {
+  curl --silent "http://127.0.0.1:4010/_x-steady/health" >/dev/null 2>&1
 }
 
 kill_server_on_port() {
@@ -25,7 +25,7 @@ function is_overriding_api_base_url() {
   [ -n "$TEST_API_BASE_URL" ]
 }
 
-if ! is_overriding_api_base_url && ! prism_is_running ; then
+if ! is_overriding_api_base_url && ! steady_is_running ; then
   # When we exit this script, make sure to kill the background mock server process
   trap 'kill_server_on_port 4010' EXIT
 
@@ -36,19 +36,19 @@ fi
 if is_overriding_api_base_url ; then
   echo -e "${GREEN}✔ Running tests against ${TEST_API_BASE_URL}${NC}"
   echo
-elif ! prism_is_running ; then
-  echo -e "${RED}ERROR:${NC} The test suite will not run without a mock Prism server"
+elif ! steady_is_running ; then
+  echo -e "${RED}ERROR:${NC} The test suite will not run without a mock Steady server"
   echo -e "running against your OpenAPI spec."
   echo
   echo -e "To run the server, pass in the path or url of your OpenAPI"
-  echo -e "spec to the prism command:"
+  echo -e "spec to the steady command:"
   echo
-  echo -e "  \$ ${YELLOW}npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock path/to/your.openapi.yml${NC}"
+  echo -e "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.22.1 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets${NC}"
   echo
 
   exit 1
 else
-  echo -e "${GREEN}✔ Mock prism server is running with your OpenAPI spec${NC}"
+  echo -e "${GREEN}✔ Mock steady server is running with your OpenAPI spec${NC}"
   echo
 fi
 
diff --git a/src/core.ts b/src/core.ts
index ba418e9..0fc283d 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -1054,10 +1054,10 @@ export const ensurePresent = <T>(value: T | null | undefined): T => {
  */
 export const readEnv = (env: string): string | undefined => {
   if (typeof process !== 'undefined') {
-    return process.env?.[env]?.trim() ?? undefined;
+    return process.env?.[env]?.trim() || undefined;
   }
   if (typeof Deno !== 'undefined') {
-    return Deno.env?.get?.(env)?.trim();
+    return Deno.env?.get?.(env)?.trim() || undefined;
   }
   return undefined;
 };
diff --git a/src/index.ts b/src/index.ts
index ca23f19..a3381f4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -161,6 +161,18 @@ export class ZeroEntropy extends Core.APIClient {
       fetch: options.fetch,
     });
 
+    const customHeadersEnv = Core.readEnv('ZEROENTROPY_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 5ed52cd..51a202a 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '0.1.0-alpha.10'; // x-release-please-version
+export const VERSION = '0.1.0-alpha.11'; // x-release-please-version