diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index faf510f..3bf7ee2 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/**'
@@ -17,7 +19,7 @@ jobs:
     timeout-minutes: 10
     name: lint
     runs-on: ${{ github.repository == 'stainless-sdks/steel-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
 
@@ -36,7 +38,7 @@ jobs:
     timeout-minutes: 5
     name: build
     runs-on: ${{ github.repository == 'stainless-sdks/steel-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
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 5e39b94..513fac0 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.18.0"
+  ".": "0.18.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 00fd031..adeb05e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,25 @@
 # Changelog
 
+## 0.18.1 (2026-03-27)
+
+Full Changelog: [v0.18.0...v0.18.1](https://github.com/steel-dev/steel-node/compare/v0.18.0...v0.18.1)
+
+### Chores
+
+* **ci:** skip lint on metadata-only changes ([24d527e](https://github.com/steel-dev/steel-node/commit/24d527ee0bbb9159048c661a2d3d0033c633ad08))
+* **internal:** tweak CI branches ([fa4a3c8](https://github.com/steel-dev/steel-node/commit/fa4a3c8cb25f384b0011669024aa85d51d908636))
+* **internal:** update gitignore ([8f42087](https://github.com/steel-dev/steel-node/commit/8f42087e15148c16aa986c3eea1b97b92f6c4823))
+* **internal:** update multipart form array serialization ([30cc0e9](https://github.com/steel-dev/steel-node/commit/30cc0e9954f7b602cabeec5267a1fcb9fd4f96de))
+* **tests:** bump steady to v0.19.4 ([ebe3263](https://github.com/steel-dev/steel-node/commit/ebe3263f2a981298c9bfe55b8459b33b0dc0ed86))
+* **tests:** bump steady to v0.19.5 ([9f1d01b](https://github.com/steel-dev/steel-node/commit/9f1d01b37859cfff93c2573125e071cfe0a91625))
+* **tests:** bump steady to v0.19.6 ([c17e027](https://github.com/steel-dev/steel-node/commit/c17e02724dd15ae8305d459156fd2bf76f596d77))
+* **tests:** bump steady to v0.19.7 ([c92d874](https://github.com/steel-dev/steel-node/commit/c92d8740ee32a60c865f8ee8ef73b16a3fbc0fd0))
+
+
+### Refactors
+
+* **tests:** switch from prism to steady ([afabeb3](https://github.com/steel-dev/steel-node/commit/afabeb349db6ed4586b5312c263350af5d6eaec9))
+
 ## 0.18.0 (2026-03-16)
 
 Full Changelog: [v0.17.0...v0.18.0](https://github.com/steel-dev/steel-node/compare/v0.17.0...v0.18.0)
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index c2a9271..d000233 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -65,7 +65,7 @@ $ pnpm link --global steel-sdk
 
 ## 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 8d1b622..3fc6e2e 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "steel-sdk",
-  "version": "0.18.0",
+  "version": "0.18.1",
   "description": "The official TypeScript library for the Steel API",
   "author": "Steel <team@steel.dev>",
   "types": "dist/index.d.ts",
diff --git a/scripts/mock b/scripts/mock
index bcf3b39..290e21b 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@0.19.7 -- steady --version
 
-  npm exec --package=@stainless-api/prism-cli@5.15.0 -- prism mock "$URL" &> .prism.log &
+  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$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 "$URL"
+  npm exec --package=@stdy/cli@0.19.7 -- steady --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets "$URL"
 fi
diff --git a/scripts/test b/scripts/test
index 7bce051..a1ebb5e 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 "  \$ ${YELLOW}npm exec --package=@stdy/cli@0.19.7 -- steady path/to/your.openapi.yml --host 127.0.0.1 -p 4010 --validator-query-array-format=comma --validator-form-array-format=comma --validator-query-object-format=brackets --validator-form-object-format=brackets${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/version.ts b/src/version.ts
index 74131f9..53b4ff4 100644
--- a/src/version.ts
+++ b/src/version.ts
@@ -1 +1 @@
-export const VERSION = '0.18.0'; // x-release-please-version
+export const VERSION = '0.18.1'; // x-release-please-version
diff --git a/tests/api-resources/files.test.ts b/tests/api-resources/files.test.ts
index ab17d35..07ac6c4 100644
--- a/tests/api-resources/files.test.ts
+++ b/tests/api-resources/files.test.ts
@@ -42,8 +42,7 @@ describe('resource files', () => {
     );
   });
 
-  // Mock server doesn't support application/octet-stream responses
-  test.skip('download: request options instead of params are passed correctly', async () => {
+  test('download: request options instead of params are passed correctly', async () => {
     // ensure the request options are being passed correctly by passing an invalid HTTP method in order to cause an error
     await expect(client.files.download('path', { path: '/_stainless_unknown_path' })).rejects.toThrow(
       Steel.NotFoundError,
diff --git a/tests/api-resources/sessions/files.test.ts b/tests/api-resources/sessions/files.test.ts
index cc343b0..2515e16 100644
--- a/tests/api-resources/sessions/files.test.ts
+++ b/tests/api-resources/sessions/files.test.ts
@@ -60,16 +60,14 @@ describe('resource files', () => {
     ).rejects.toThrow(Steel.NotFoundError);
   });
 
-  // Mock server doesn't support application/octet-stream responses
-  test.skip('download: request options instead of params are passed correctly', async () => {
+  test('download: request options instead of params are passed correctly', async () => {
     // ensure the request options are being passed correctly by passing an invalid HTTP method in order to cause an error
     await expect(
       client.sessions.files.download('sessionId', 'path', { path: '/_stainless_unknown_path' }),
     ).rejects.toThrow(Steel.NotFoundError);
   });
 
-  // Mock server doesn't support application/zip responses
-  test.skip('downloadArchive: request options instead of params are passed correctly', async () => {
+  test('downloadArchive: request options instead of params are passed correctly', async () => {
     // ensure the request options are being passed correctly by passing an invalid HTTP method in order to cause an error
     await expect(
       client.sessions.files.downloadArchive('sessionId', { path: '/_stainless_unknown_path' }),