diff --git a/__tests__/main.test.ts b/__tests__/main.test.ts
index 915827e..94ec4c6 100644
--- a/__tests__/main.test.ts
+++ b/__tests__/main.test.ts
@@ -267,6 +267,24 @@ describe('action', () => {
     expect(setOutputMock).toHaveBeenNthCalledWith(2, 'category', 'extra small')
   })
 
+  it('runs the workflow sucessfully regardless of casing of optIns and pull request author login', async () => {
+    // Mock the @actions/github context.
+    Object.defineProperty(github, 'context', {
+      value: pullRequestEventContext({ user: { login: 'LeReBeAr' } })
+    })
+
+    loadConfigurationMock.mockImplementation(() => ({
+      optIns: ['lerebear']
+    }))
+
+    await main.run()
+
+    expect(runMock).toHaveReturned()
+    expect(setFailedMock).not.toHaveBeenCalled()
+    expect(setOutputMock).toHaveBeenNthCalledWith(1, 'score', 1)
+    expect(setOutputMock).toHaveBeenNthCalledWith(2, 'category', 'extra small')
+  })
+
   it('skips the workflow entirely when the pull request author has not opted into it', async () => {
     // Mock the @actions/github context.
     Object.defineProperty(github, 'context', {
diff --git a/dist/index.js b/dist/index.js
index 0397a15..d699a30 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -105840,7 +105840,7 @@ var OptInStatus;
 function getOptInStatus(pull, config) {
     const usersWhoHaveOptedin = config.optIns || [];
     const userHasOptedOut = usersWhoHaveOptedin.length &&
-        !usersWhoHaveOptedin.find((login) => login === pull.user.login);
+        !usersWhoHaveOptedin.find((login) => login.toLowerCase() === pull.user.login.toLowerCase());
     if (userHasOptedOut && config.shadowOptOuts) {
         core.info('Executing workflow silently for user who was not opted in');
         return OptInStatus.Shadow;
diff --git a/src/initializer.ts b/src/initializer.ts
index 9a751e9..fa3ea4d 100644
--- a/src/initializer.ts
+++ b/src/initializer.ts
@@ -43,7 +43,9 @@ export function getOptInStatus(
   const usersWhoHaveOptedin = config.optIns || []
   const userHasOptedOut =
     usersWhoHaveOptedin.length &&
-    !usersWhoHaveOptedin.find((login: string) => login === pull.user.login)
+    !usersWhoHaveOptedin.find(
+      (login: string) => login.toLowerCase() === pull.user.login.toLowerCase()
+    )
 
   if (userHasOptedOut && config.shadowOptOuts) {
     core.info('Executing workflow silently for user who was not opted in')