diff --git a/.changeset/openapi-version-in-step.md b/.changeset/openapi-version-in-step.md
new file mode 100644
index 00000000..25a2d44d
--- /dev/null
+++ b/.changeset/openapi-version-in-step.md
@@ -0,0 +1,5 @@
+---
+'seamless-auth-api': patch
+---
+
+`openapi.json` and `adapter-manifest.json` now carry the package version. The release version step regenerates both, and the contract test fails when either file drifts from the route definitions or from `package.json`. Both said 0.17.0 through the 0.18.0 release.
diff --git a/adapter-manifest.json b/adapter-manifest.json
index 8971c138..29e0240f 100644
--- a/adapter-manifest.json
+++ b/adapter-manifest.json
@@ -1,6 +1,6 @@
 {
   "schemaVersion": 1,
-  "apiVersion": "0.17.0",
+  "apiVersion": "0.18.0",
   "session": {
     "subject": "sub",
     "token": "token",
diff --git a/openapi.json b/openapi.json
index 5740e16c..acd42f63 100644
--- a/openapi.json
+++ b/openapi.json
@@ -1,6 +1,6 @@
 {
   "openapi": "3.0.3",
-  "info": { "title": "Seamless Auth API", "version": "0.17.0" },
+  "info": { "title": "Seamless Auth API", "version": "0.18.0" },
   "components": {
     "schemas": {},
     "parameters": {},
diff --git a/package.json b/package.json
index f6e326a1..e983fb69 100644
--- a/package.json
+++ b/package.json
@@ -27,7 +27,7 @@
     "format:check": "prettier --check .",
     "changeset": "changeset",
     "check:changeset-bump": "node ./src/scripts/checkChangesetBump.mjs",
-    "version-packages": "changeset version",
+    "version-packages": "changeset version && npm run generate:api",
     "db:create": "env-cmd -f .env sequelize-cli db:create || sequelize-cli db:create",
     "db:drop": "env-cmd -f .env sequelize-cli db:drop || sequelize-cli db:drop",
     "db:refresh": "env-cmd -f .env sequelize-cli db:drop && sequelize-cli db:create",
diff --git a/tests/unit/openapi/generatedContract.spec.ts b/tests/unit/openapi/generatedContract.spec.ts
index d44e5ed7..51ded094 100644
--- a/tests/unit/openapi/generatedContract.spec.ts
+++ b/tests/unit/openapi/generatedContract.spec.ts
@@ -4,6 +4,7 @@ import { fileURLToPath } from 'node:url';
 
 import { describe, expect, it } from 'vitest';
 
+import { getAdapterManifest } from '../../../src/lib/adapterManifest.js';
 import { buildOpenApiDocument } from '../../../src/scripts/generateApiTypes.js';
 
 const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '../../..');
@@ -12,14 +13,26 @@ function readCommitted(relativePath: string) {
   return readFileSync(join(repoRoot, relativePath), 'utf8');
 }
 
+const packageVersion = JSON.parse(readCommitted('package.json')).version;
+
 describe('generated API contract', () => {
   it('keeps openapi.json in step with the route definitions', async () => {
     const generated = await buildOpenApiDocument();
     const committed = JSON.parse(readCommitted('openapi.json'));
 
-    // The version tracks package.json, which Changesets bumps on release without
-    // regenerating. Everything else must match.
-    expect({ ...generated, info: undefined }).toEqual({ ...committed, info: undefined });
+    expect(committed).toEqual(generated);
+  });
+
+  it('versions openapi.json with the package', () => {
+    expect(JSON.parse(readCommitted('openapi.json')).info.version).toBe(packageVersion);
+  });
+
+  it('keeps adapter-manifest.json in step with the route definitions', async () => {
+    await buildOpenApiDocument();
+    const committed = JSON.parse(readCommitted('adapter-manifest.json'));
+
+    expect(committed).toEqual(JSON.parse(JSON.stringify(getAdapterManifest())));
+    expect(committed.apiVersion).toBe(packageVersion);
   });
 
   it('ships non-empty generated types', () => {