diff --git a/src/cmap/auth/providers.ts b/src/cmap/auth/providers.ts
index 74e3638ecc5..fe6a57cef37 100644
--- a/src/cmap/auth/providers.ts
+++ b/src/cmap/auth/providers.ts
@@ -1,7 +1,6 @@
 /** @public */
 export const AuthMechanism = Object.freeze({
   MONGODB_AWS: 'MONGODB-AWS',
-  MONGODB_CR: 'MONGODB-CR',
   MONGODB_DEFAULT: 'DEFAULT',
   MONGODB_GSSAPI: 'GSSAPI',
   MONGODB_PLAIN: 'PLAIN',
diff --git a/src/mongo_client_auth_providers.ts b/src/mongo_client_auth_providers.ts
index 54aab957a56..f458726db76 100644
--- a/src/mongo_client_auth_providers.ts
+++ b/src/mongo_client_auth_providers.ts
@@ -21,14 +21,6 @@ const AUTH_PROVIDERS = new Map<
     AuthMechanism.MONGODB_AWS,
     ({ AWS_CREDENTIAL_PROVIDER }) => new MongoDBAWS(AWS_CREDENTIAL_PROVIDER)
   ],
-  [
-    AuthMechanism.MONGODB_CR,
-    () => {
-      throw new MongoInvalidArgumentError(
-        'MONGODB-CR is no longer a supported auth mechanism in MongoDB 4.0+'
-      );
-    }
-  ],
   [AuthMechanism.MONGODB_GSSAPI, () => new GSSAPI()],
   [AuthMechanism.MONGODB_OIDC, properties => new MongoDBOIDC(getWorkflow(properties))],
   [AuthMechanism.MONGODB_PLAIN, () => new Plain()],
diff --git a/test/unit/connection_string.test.ts b/test/unit/connection_string.test.ts
index e53eb7e51f2..1d9f8773933 100644
--- a/test/unit/connection_string.test.ts
+++ b/test/unit/connection_string.test.ts
@@ -595,7 +595,7 @@ describe('Connection String', function () {
     it('should validate authMechanism', function () {
       expect(() => parseOptions('mongodb://localhost/?authMechanism=DOGS')).to.throw(
         MongoParseError,
-        'authMechanism one of MONGODB-AWS,MONGODB-CR,DEFAULT,GSSAPI,PLAIN,SCRAM-SHA-1,SCRAM-SHA-256,MONGODB-X509,MONGODB-OIDC, got DOGS'
+        'authMechanism one of MONGODB-AWS,DEFAULT,GSSAPI,PLAIN,SCRAM-SHA-1,SCRAM-SHA-256,MONGODB-X509,MONGODB-OIDC, got DOGS'
       );
     });