diff --git a/frontend/src/api/projectsApi.ts b/frontend/src/api/projectsApi.ts
index 5247dfd5..4b743ec2 100644
--- a/frontend/src/api/projectsApi.ts
+++ b/frontend/src/api/projectsApi.ts
@@ -1,6 +1,6 @@
 import type { ProjectFormValues } from '@/components/Project/ProjectForm'
 import type { UserOption } from '@/hooks/useUsersApi'
-import type { ProjectDetailsType } from '@/shared/types'
+import type { ProjectDetailsType, ProjectPeople } from '@/shared/types'
 
 const findUserIdByInitials = (users: UserOption[], initials: string | null): number | null => {
   if (!initials) return null
@@ -10,12 +10,12 @@ const findUserIdByInitials = (users: UserOption[], initials: string | null): num
 
 const mapMembersToUserIds = (project: ProjectDetailsType, users: UserOption[]): number[] => {
   const ids = project.now_proj_people
-    .map(member => {
+    .map((member: ProjectPeople) => {
       const userIdFromRelation = member.com_people?.user?.user_id
       if (typeof userIdFromRelation === 'number') return userIdFromRelation
       return findUserIdByInitials(users, member.initials)
     })
-    .filter((id): id is number => typeof id === 'number')
+    .filter((id: number | null): id is number => typeof id === 'number')
 
   return Array.from(new Set(ids))
 }
diff --git a/frontend/src/components/Project/MembersMultiSelect.tsx b/frontend/src/components/Project/MembersMultiSelect.tsx
index e8aac4d6..ec1a0778 100644
--- a/frontend/src/components/Project/MembersMultiSelect.tsx
+++ b/frontend/src/components/Project/MembersMultiSelect.tsx
@@ -180,8 +180,8 @@ const MembersMultiSelectDetail = () => {
       fieldName="now_proj_people"
       idFieldName="initials"
       selectedValues={editData.now_proj_people
-        .map(member => member.initials)
-        .filter((initial): initial is string => typeof initial === 'string')}
+        .map((member: ProjectMemberRow) => member.initials)
+        .filter((initial: string): initial is string => typeof initial === 'string')}
       editingAction={person =>
         setEditData({
           ...editData,