diff --git a/src/client.ts b/src/client.ts
index d5933ef..c0e4e89 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -90,7 +90,7 @@ type Commit = components['schemas']['commit'];
 // https://docs.github.com/en/rest/commits/commits#get-a-commit
 export async function getCommit(context: any, sha: string): Promise<Commit> {
 	const request = context.repo({
-		sha,
+		ref: sha,
 	});
 	const { data: commit } = await context.octokit.rest.repos.getCommit(request);
 	return commit;
diff --git a/tests/handlers/deployment-protection-rule.test.ts b/tests/handlers/deployment-protection-rule.test.ts
index 1c0bc6d..1833dbc 100644
--- a/tests/handlers/deployment-protection-rule.test.ts
+++ b/tests/handlers/deployment-protection-rule.test.ts
@@ -60,8 +60,7 @@ describe('Deployment Protection Rule Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 5 }, committer: { id: 123 } })
 			.post(
 				'/repos/test-org/test-repo/actions/runs/1234/deployment_protection_rule',
@@ -114,8 +113,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [])
@@ -142,8 +140,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [])
@@ -168,8 +165,7 @@ describe('Deployment Protection Rule Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 5 }, committer: { id: 123 } })
 			.post(
 				'/repos/test-org/test-repo/actions/runs/1234/deployment_protection_rule',
@@ -190,8 +186,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [
@@ -223,8 +218,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [
@@ -256,8 +250,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 456 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [
@@ -291,8 +284,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 456 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [
@@ -326,8 +318,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [
@@ -361,8 +352,7 @@ describe('Deployment Protection Rule Handler', () => {
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
 			.get('/app')
 			.reply(200, { id: 456 })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/pulls/123/reviews')
 			.reply(200, [])
diff --git a/tests/handlers/pull-request-review.test.ts b/tests/handlers/pull-request-review.test.ts
index 5d4b8f6..9a9c859 100644
--- a/tests/handlers/pull-request-review.test.ts
+++ b/tests/handlers/pull-request-review.test.ts
@@ -60,8 +60,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/actions/runs')
 			.query(true)
@@ -153,8 +152,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 456 } });
 
 		await probot.receive({
@@ -180,8 +178,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 456 }, committer: { id: 123 } });
 
 		await probot.receive({
@@ -196,8 +193,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/actions/runs')
 			.query(true)
@@ -215,8 +211,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/actions/runs')
 			.query(true)
@@ -236,8 +231,7 @@ describe('Pull Request Review Handler', () => {
 		const mock = nock('https://api.github.com')
 			.post('/app/installations/12345678/access_tokens')
 			.reply(200, { token: 'test', permissions: { issues: 'write' } })
-			.get('/repos/test-org/test-repo/commits')
-			.query(true)
+			.get('/repos/test-org/test-repo/commits/test-sha')
 			.reply(200, { author: { id: 123 }, committer: { id: 123 } })
 			.get('/repos/test-org/test-repo/actions/runs')
 			.query(true)