diff --git a/package.json b/package.json
index a38faf99..738e6835 100644
--- a/package.json
+++ b/package.json
@@ -132,6 +132,8 @@
 		"node": ">=22.0.0"
 	},
 	"overrides": {
-		"lodash-es": "^4.18.1"
+		"lodash": "^4.18.1",
+		"lodash-es": "^4.18.1",
+		"brace-expansion": "^2.0.3"
 	}
 }
diff --git a/src/api/routers/users.ts b/src/api/routers/users.ts
index b81ab6af..cb26009c 100644
--- a/src/api/routers/users.ts
+++ b/src/api/routers/users.ts
@@ -4,6 +4,7 @@ import { z } from 'zod';
 import {
 	createUser,
 	deleteUser,
+	deleteUserSessions,
 	getUserById,
 	listOrgUsers,
 	updateUser,
@@ -122,6 +123,12 @@ export const usersRouter = router({
 			}
 
 			await updateUser(input.id, updates);
+
+			// Invalidate all sessions for the target user when their password changes.
+			// This prevents stale sessions from remaining valid after a password reset.
+			if (updates.passwordHash !== undefined) {
+				await deleteUserSessions(input.id);
+			}
 		}),
 
 	delete: adminProcedure.input(z.object({ id: z.string() })).mutation(async ({ ctx, input }) => {
diff --git a/src/db/repositories/usersRepository.ts b/src/db/repositories/usersRepository.ts
index a7cddeb7..f927ae8f 100644
--- a/src/db/repositories/usersRepository.ts
+++ b/src/db/repositories/usersRepository.ts
@@ -84,6 +84,21 @@ export async function deleteExpiredSessions(): Promise<void> {
 	await db.delete(sessions).where(lt(sessions.expiresAt, new Date()));
 }
 
+/**
+ * Delete all sessions for a given user. Optionally exclude a specific token
+ * (e.g. to preserve the caller's own session when they change their own password).
+ */
+export async function deleteUserSessions(userId: string, excludeToken?: string): Promise<void> {
+	const db = getDb();
+	if (excludeToken !== undefined) {
+		await db
+			.delete(sessions)
+			.where(and(eq(sessions.userId, userId), ne(sessions.token, excludeToken)));
+	} else {
+		await db.delete(sessions).where(eq(sessions.userId, userId));
+	}
+}
+
 // ============================================================================
 // CRUD for users (org-scoped)
 // ============================================================================
diff --git a/tests/unit/api/routers/users.test.ts b/tests/unit/api/routers/users.test.ts
index 11b6493a..5cd943e3 100644
--- a/tests/unit/api/routers/users.test.ts
+++ b/tests/unit/api/routers/users.test.ts
@@ -8,6 +8,7 @@ const {
 	mockUpdateUser,
 	mockDeleteUser,
 	mockGetUserById,
+	mockDeleteUserSessions,
 	mockBcryptHash,
 } = vi.hoisted(() => ({
 	mockListOrgUsers: vi.fn(),
@@ -15,6 +16,7 @@ const {
 	mockUpdateUser: vi.fn(),
 	mockDeleteUser: vi.fn(),
 	mockGetUserById: vi.fn(),
+	mockDeleteUserSessions: vi.fn(),
 	mockBcryptHash: vi.fn(),
 }));
 
@@ -24,6 +26,7 @@ vi.mock('../../../../src/db/repositories/usersRepository.js', () => ({
 	updateUser: mockUpdateUser,
 	deleteUser: mockDeleteUser,
 	getUserById: mockGetUserById,
+	deleteUserSessions: mockDeleteUserSessions,
 }));
 
 vi.mock('bcrypt', () => ({
@@ -43,6 +46,7 @@ const mockMember = createMockUser({ id: 'member-1', role: 'member' });
 describe('usersRouter', () => {
 	beforeEach(() => {
 		mockBcryptHash.mockResolvedValue('hashed-password');
+		mockDeleteUserSessions.mockResolvedValue(undefined);
 	});
 
 	describe('list', () => {
@@ -406,6 +410,36 @@ describe('usersRouter', () => {
 				code: 'FORBIDDEN',
 			});
 		});
+
+		it('invalidates all sessions when password is changed', async () => {
+			mockGetUserById.mockResolvedValue({ id: 'user-2', orgId: 'org-1', role: 'member' });
+			mockUpdateUser.mockResolvedValue(undefined);
+			const caller = createCaller({ user: mockAdminUser, effectiveOrgId: mockAdminUser.orgId });
+
+			await caller.update({ id: 'user-2', password: 'newpassword12' });
+
+			expect(mockDeleteUserSessions).toHaveBeenCalledWith('user-2');
+		});
+
+		it('does not invalidate sessions when password is not changed', async () => {
+			mockGetUserById.mockResolvedValue({ id: 'user-2', orgId: 'org-1', role: 'member' });
+			mockUpdateUser.mockResolvedValue(undefined);
+			const caller = createCaller({ user: mockAdminUser, effectiveOrgId: mockAdminUser.orgId });
+
+			await caller.update({ id: 'user-2', name: 'New Name' });
+
+			expect(mockDeleteUserSessions).not.toHaveBeenCalled();
+		});
+
+		it('does not invalidate sessions when only role/email are changed', async () => {
+			mockGetUserById.mockResolvedValue({ id: 'user-2', orgId: 'org-1', role: 'member' });
+			mockUpdateUser.mockResolvedValue(undefined);
+			const caller = createCaller({ user: mockAdminUser, effectiveOrgId: mockAdminUser.orgId });
+
+			await caller.update({ id: 'user-2', email: 'new@example.com' });
+
+			expect(mockDeleteUserSessions).not.toHaveBeenCalled();
+		});
 	});
 
 	describe('delete', () => {
diff --git a/tests/unit/db/repositories/usersRepository.test.ts b/tests/unit/db/repositories/usersRepository.test.ts
index 61c37f97..ccb1b546 100644
--- a/tests/unit/db/repositories/usersRepository.test.ts
+++ b/tests/unit/db/repositories/usersRepository.test.ts
@@ -29,6 +29,7 @@ import {
 	deleteExpiredSessions,
 	deleteSession,
 	deleteUser,
+	deleteUserSessions,
 	getSessionByToken,
 	getUserByEmail,
 	getUserById,
@@ -288,4 +289,34 @@ describe('usersRepository', () => {
 			expect(mockDb.db.delete).toHaveBeenCalledTimes(1);
 		});
 	});
+
+	describe('deleteUserSessions', () => {
+		it('deletes all sessions for a user', async () => {
+			mockDb.chain.where.mockResolvedValueOnce(undefined);
+
+			await deleteUserSessions('user-1');
+
+			expect(mockDb.db.delete).toHaveBeenCalledTimes(1);
+		});
+
+		it('deletes all sessions when excludeToken is not provided', async () => {
+			mockDb.chain.where.mockResolvedValueOnce(undefined);
+
+			await deleteUserSessions('user-1');
+
+			// Without excludeToken the where clause uses a single eq condition (no and/ne)
+			expect(mockDb.db.delete).toHaveBeenCalledTimes(1);
+			expect(mockDb.chain.where).toHaveBeenCalledTimes(1);
+		});
+
+		it('excludes a specific token when provided', async () => {
+			mockDb.chain.where.mockResolvedValueOnce(undefined);
+
+			await deleteUserSessions('user-1', 'keep-this-token');
+
+			// With excludeToken the where clause uses an and(eq, ne) condition
+			expect(mockDb.db.delete).toHaveBeenCalledTimes(1);
+			expect(mockDb.chain.where).toHaveBeenCalledTimes(1);
+		});
+	});
 });