diff --git a/src/fiber_package/groups/committees/committee.py b/src/fiber_package/groups/committees/committee.py
index ff071f8..898da4f 100644
--- a/src/fiber_package/groups/committees/committee.py
+++ b/src/fiber_package/groups/committees/committee.py
@@ -37,7 +37,7 @@ class CommitteeModel(BaseModel):
 
 class CommitteeEditionModel(BaseModel):
     members: EntityList
-    functions: dict[UUID4, str]
+    functions: dict[UUID7, str]
 
     start_date: date
     end_date: date | None # None means ongoing
diff --git a/src/fiber_package/util.py b/src/fiber_package/util.py
index 2c6c325..f4b84c4 100644
--- a/src/fiber_package/util.py
+++ b/src/fiber_package/util.py
@@ -1,9 +1,9 @@
 from typing import Annotated
-from pydantic import RootModel, Field, UUID4
+from pydantic import RootModel, Field, UUID7
 
 
-EntityList = Annotated[list[UUID4], Field(default_factory=list)]
-GroupList  = Annotated[list[UUID4], Field(default_factory=list)]
+EntityList = Annotated[list[UUID7], Field(default_factory=list)]
+GroupList  = Annotated[list[UUID7], Field(default_factory=list)]
 
-EntityRef = UUID4
-GroupRef = UUID4
\ No newline at end of file
+EntityRef = UUID7
+GroupRef = UUID7
\ No newline at end of file