diff --git a/docs/docs/cmd/entra/roledefinition/roledefinition-set.mdx b/docs/docs/cmd/entra/roledefinition/roledefinition-set.mdx
new file mode 100644
index 0000000000..a17bebc2e5
--- /dev/null
+++ b/docs/docs/cmd/entra/roledefinition/roledefinition-set.mdx
@@ -0,0 +1,60 @@
+import Global from '/docs/cmd/_global.mdx';
+
+# entra roledefinition set
+
+Updates a custom Microsoft Entra ID role definition
+
+## Usage
+
+```sh
+m365 entra roledefinition set [options]
+```
+
+## Options
+
+```md definition-list
+`-i, --id [id]`
+: The id of the role definition to be updated. Specify either `id` or `displayName`, but not both.
+
+`-n, --displayName [displayName]`
+: The display name of the role definition to be updated. Specify either `id` or `displayName`, but not both.
+
+`--newDisplayName [newDisplayName]`
+: Updated display name for the role definition.
+
+`-d, --description [description]`
+: Updated description for the role definition.
+
+`-e, --enabled [enabled]`
+: Indicates if the role is enabled for the assignment.
+
+`a-, --allowedResourceActions [allowedResourceActions]`
+: Updated comma-separated list of resource actions allowed for the role.
+
+`-v, --version [version]`
+: Updated version of the role definition.
+```
+
+<Global />
+
+## Examples
+
+Update a custom Microsoft Entra ID role specified by the id
+
+```sh
+m365 entra roledefinition set --id fadbc488-151d-4431-9143-6abbffae759f --newDisplayName 'Application Remover' --description 'Allows to remove any Entra ID application' --allowedResourceActions 'microsoft.directory/applications/delete'
+```
+
+Update a custom Microsoft Entra ID role specified by the display name
+
+```sh
+m365 entra roledefinition set --displayName 'Application Remover' --version '1.0' --enabled true --allowedResourceActions 'microsoft.directory/applications/delete,microsoft.directory/applications/owners/update'
+```
+
+## Response
+
+The command won't return a response on success
+
+## More information
+
+- https://learn.microsoft.com/graph/api/rbacapplication-post-roledefinitions
\ No newline at end of file
diff --git a/docs/src/config/sidebars.ts b/docs/src/config/sidebars.ts
index 0d17dbbf22..ead561006e 100644
--- a/docs/src/config/sidebars.ts
+++ b/docs/src/config/sidebars.ts
@@ -653,6 +653,11 @@ const sidebars: SidebarsConfig = {
               type: 'doc',
               label: 'roledefinition remove',
               id: 'cmd/entra/roledefinition/roledefinition-remove'
+            },
+            {
+              type: 'doc',
+              label: 'roledefinition set',
+              id: 'cmd/entra/roledefinition/roledefinition-set'
             }
           ]
         },
diff --git a/src/m365/entra/commands.ts b/src/m365/entra/commands.ts
index f821e6f049..15d3156488 100644
--- a/src/m365/entra/commands.ts
+++ b/src/m365/entra/commands.ts
@@ -93,6 +93,7 @@ export default {
   ROLEDEFINITION_LIST: `${prefix} roledefinition list`,
   ROLEDEFINITION_GET: `${prefix} roledefinition get`,
   ROLEDEFINITION_REMOVE: `${prefix} roledefinition remove`,
+  ROLEDEFINITION_SET: `${prefix} roledefinition set`,
   SITECLASSIFICATION_DISABLE: `${prefix} siteclassification disable`,
   SITECLASSIFICATION_ENABLE: `${prefix} siteclassification enable`,
   SITECLASSIFICATION_GET: `${prefix} siteclassification get`,
diff --git a/src/m365/entra/commands/roledefinition/roledefinition-set.spec.ts b/src/m365/entra/commands/roledefinition/roledefinition-set.spec.ts
new file mode 100644
index 0000000000..76f26d45b3
--- /dev/null
+++ b/src/m365/entra/commands/roledefinition/roledefinition-set.spec.ts
@@ -0,0 +1,156 @@
+import assert from 'assert';
+import sinon from 'sinon';
+import auth from '../../../../Auth.js';
+import commands from '../../commands.js';
+import request from '../../../../request.js';
+import { Logger } from '../../../../cli/Logger.js';
+import { telemetry } from '../../../../telemetry.js';
+import { pid } from '../../../../utils/pid.js';
+import { session } from '../../../../utils/session.js';
+import command from './roledefinition-set.js';
+import { sinonUtil } from '../../../../utils/sinonUtil.js';
+import { CommandError } from '../../../../Command.js';
+import { z } from 'zod';
+import { CommandInfo } from '../../../../cli/CommandInfo.js';
+import { cli } from '../../../../cli/cli.js';
+import { roleDefinition } from '../../../../utils/roleDefinition.js';
+
+describe(commands.ROLEDEFINITION_SET, () => {
+  const roleId = 'abcd1234-de71-4623-b4af-96380a352509';
+  const roleDisplayName = 'Custom Role';
+
+  let log: string[];
+  let logger: Logger;
+  let commandInfo: CommandInfo;
+  let commandOptionsSchema: z.ZodTypeAny;
+
+  before(() => {
+    sinon.stub(auth, 'restoreAuth').resolves();
+    sinon.stub(telemetry, 'trackEvent').returns();
+    sinon.stub(pid, 'getProcessName').returns('');
+    sinon.stub(session, 'getId').returns('');
+    auth.connection.active = true;
+    commandInfo = cli.getCommandInfo(command);
+    commandOptionsSchema = commandInfo.command.getSchemaToParse()!;
+  });
+
+  beforeEach(() => {
+    log = [];
+    logger = {
+      log: async (msg: string) => {
+        log.push(msg);
+      },
+      logRaw: async (msg: string) => {
+        log.push(msg);
+      },
+      logToStderr: async (msg: string) => {
+        log.push(msg);
+      }
+    };
+  });
+
+  afterEach(() => {
+    sinonUtil.restore([
+      request.patch
+    ]);
+  });
+
+  after(() => {
+    sinon.restore();
+    auth.connection.active = false;
+  });
+
+  it('has correct name', () => {
+    assert.strictEqual(command.name, commands.ROLEDEFINITION_SET);
+  });
+
+  it('has a description', () => {
+    assert.notStrictEqual(command.description, null);
+  });
+
+  it('fails validation if id is not a valid GUID', () => {
+    const actual = commandOptionsSchema.safeParse({
+      id: 'foo'
+    });
+    assert.notStrictEqual(actual.success, true);
+  });
+
+  it('fails validation if both id and displayName are provided', () => {
+    const actual = commandOptionsSchema.safeParse({
+      id: roleId,
+      displayName: roleDisplayName
+    });
+    assert.notStrictEqual(actual.success, true);
+  });
+
+  it('fails validation if neither id nor displayName is provided', () => {
+    const actual = commandOptionsSchema.safeParse({});
+    assert.notStrictEqual(actual.success, true);
+  });
+
+  it('fails validation if neither newDisplayName, description, allowedResourceActions, enabled nor version is provided', () => {
+    const actual = commandOptionsSchema.safeParse({ id: roleId });
+    assert.notStrictEqual(actual.success, true);
+  });
+
+  it('updates a custom role definition specified by id', async () => {
+    const patchRequestStub = sinon.stub(request, 'patch').callsFake(async (opts) => {
+      if (opts.url === `https://graph.microsoft.com/v1.0/roleManagement/directory/roleDefinitions/${roleId}`) {
+        return;
+      }
+
+      throw 'Invalid request';
+    });
+
+    const parsedSchema = commandOptionsSchema.safeParse({ id: roleId, allowedResourceActions: "microsoft.directory/groups.unified/create,microsoft.directory/groups.unified/delete" });
+    await command.action(logger, { options: parsedSchema.data });
+    assert(patchRequestStub.called);
+  });
+
+  it('updates a custom role definition specified by displayName', async () => {
+    sinon.stub(roleDefinition, 'getRoleDefinitionByDisplayName').resolves({ id: roleId });
+
+    const patchRequestStub = sinon.stub(request, 'patch').callsFake(async (opts) => {
+      if (opts.url === `https://graph.microsoft.com/v1.0/roleManagement/directory/roleDefinitions/${roleId}`) {
+        return;
+      }
+
+      throw 'Invalid request';
+    });
+
+    const parsedSchema = commandOptionsSchema.safeParse({
+      displayName: roleDisplayName,
+      newDisplayName: 'Custom Role Test',
+      description: 'Allows creating and deleting unified groups',
+      allowedResourceActions: "microsoft.directory/groups.unified/create,microsoft.directory/groups.unified/delete",
+      enabled: false,
+      version: "2",
+      verbose: true
+    });
+    await command.action(logger, {
+      options: parsedSchema.data
+    });
+    assert(patchRequestStub.called);
+  });
+
+  it('correctly handles API OData error', async () => {
+    sinon.stub(request, 'patch').rejects({
+      error: {
+        'odata.error': {
+          code: '-1, InvalidOperationException',
+          message: {
+            value: 'Invalid request'
+          }
+        }
+      }
+    });
+
+    const parsedSchema = commandOptionsSchema.safeParse({
+      displayName: 'Custom Role',
+      allowedResourceActions: "microsoft.directory/groups.unified/create"
+    });
+    await assert.rejects(command.action(logger, {
+      options: parsedSchema.data
+    }), new CommandError('Invalid request'));
+  });
+});
\ No newline at end of file
diff --git a/src/m365/entra/commands/roledefinition/roledefinition-set.ts b/src/m365/entra/commands/roledefinition/roledefinition-set.ts
new file mode 100644
index 0000000000..f0c8df0af7
--- /dev/null
+++ b/src/m365/entra/commands/roledefinition/roledefinition-set.ts
@@ -0,0 +1,104 @@
+import { z } from 'zod';
+import { globalOptionsZod } from '../../../../Command.js';
+import { zod } from '../../../../utils/zod.js';
+import GraphCommand from '../../../base/GraphCommand.js';
+import commands from '../../commands.js';
+import { Logger } from '../../../../cli/Logger.js';
+import request, { CliRequestOptions } from '../../../../request.js';
+import { roleDefinition } from '../../../../utils/roleDefinition.js';
+import { validation } from '../../../../utils/validation.js';
+import { UnifiedRoleDefinition } from '@microsoft/microsoft-graph-types';
+
+const options = globalOptionsZod
+  .extend({
+    id: zod.alias('i', z.string().optional()),
+    displayName: zod.alias('n', z.string().optional()),
+    newDisplayName: z.string().optional(),
+    allowedResourceActions: zod.alias('a', z.string().optional()),
+    description: zod.alias('d', z.string().optional()),
+    enabled: zod.alias('e', z.boolean().optional()),
+    version: zod.alias('v', z.string().optional())
+  })
+  .strict();
+
+declare type Options = z.infer<typeof options>;
+
+interface CommandArgs {
+  options: Options;
+}
+
+class EntraRoleDefinitionSetCommand extends GraphCommand {
+  public get name(): string {
+    return commands.ROLEDEFINITION_SET;
+  }
+
+  public get description(): string {
+    return 'Updates a custom Microsoft Entra ID role definition';
+  }
+
+  public get schema(): z.ZodTypeAny | undefined {
+    return options;
+  }
+
+  public getRefinedSchema(schema: typeof options): z.ZodEffects<any> | undefined {
+    return schema
+      .refine(options => !options.id !== !options.displayName, {
+        message: 'Specify either id or displayName, but not both'
+      })
+      .refine(options => options.id || options.displayName, {
+        message: 'Specify either id or displayName'
+      })
+      .refine(options => (!options.id && !options.displayName) || options.displayName || (options.id && validation.isValidGuid(options.id)), options => ({
+        message: `The '${options.id}' must be a valid GUID`,
+        path: ['id']
+      }))
+      .refine(options => Object.values([options.newDisplayName, options.description, options.allowedResourceActions, options.enabled, options.version]).filter(v => typeof v !== 'undefined').length > 0, {
+        message: 'Provide value for at least one of the following parameters: newDisplayName, description, allowedResourceActions, enabled or version'
+      });
+  }
+
+  public async commandAction(logger: Logger, args: CommandArgs): Promise<void> {
+    try {
+      let roleDefinitionId = args.options.id;
+
+      if (args.options.displayName) {
+        roleDefinitionId = (await roleDefinition.getRoleDefinitionByDisplayName(args.options.displayName, 'id')).id;
+      }
+
+      if (args.options.verbose) {
+        await logger.logToStderr(`Updating custom role definition with ID ${roleDefinitionId}...`);
+      }
+
+      const data: UnifiedRoleDefinition = {
+        displayName: args.options.newDisplayName,
+        description: args.options.description,
+        isEnabled: args.options.enabled,
+        version: args.options.version
+      };
+
+      if (args.options.allowedResourceActions) {
+        data['rolePermissions'] = [
+          {
+            allowedResourceActions: args.options.allowedResourceActions.split(',')
+          }
+        ];
+      }
+
+      const requestOptions: CliRequestOptions = {
+        url: `${this.resource}/v1.0/roleManagement/directory/roleDefinitions/${roleDefinitionId}`,
+        headers: {
+          accept: 'application/json;odata.metadata=none'
+        },
+        data: data,
+        responseType: 'json'
+      };
+
+      await request.patch(requestOptions);
+    }
+    catch (err: any) {
+      this.handleRejectedODataJsonPromise(err);
+    }
+  }
+}
+
+export default new EntraRoleDefinitionSetCommand();
\ No newline at end of file