diff --git a/server/mergin/stats/tasks.py b/server/mergin/stats/tasks.py
index 4770a90e..345d68cd 100644
--- a/server/mergin/stats/tasks.py
+++ b/server/mergin/stats/tasks.py
@@ -64,6 +64,7 @@ def send_statistics():
         "workspaces_count": current_app.ws_handler.workspace_count(),
         "last_change": str(last_change_item.updated) + "Z" if last_change_item else "",
         "server_version": current_app.config["VERSION"],
+        "monthly_contributors": current_app.ws_handler.monthly_contributors_count(),
     }
 
     try:
diff --git a/server/mergin/sync/interfaces.py b/server/mergin/sync/interfaces.py
index 8084b091..4cf12650 100644
--- a/server/mergin/sync/interfaces.py
+++ b/server/mergin/sync/interfaces.py
@@ -154,6 +154,13 @@ def workspace_count():
         """
         pass
 
+    @staticmethod
+    def monthly_contributors_count():
+        """
+        Return number of workspace contributors in current month and year
+        """
+        pass
+
 
 class AbstractProjectHandler(ABC):
     @abstractmethod
diff --git a/server/mergin/sync/workspace.py b/server/mergin/sync/workspace.py
index 86360fef..7781f7be 100644
--- a/server/mergin/sync/workspace.py
+++ b/server/mergin/sync/workspace.py
@@ -2,14 +2,20 @@
 #
 # SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-MerginMaps-Commercial
 
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from typing import Dict, Tuple, Optional, Set, List
 from flask_login import current_user
-from sqlalchemy import or_, and_, Column, literal
+from sqlalchemy import or_, and_, Column, literal, extract
 from sqlalchemy.orm import joinedload
 
 from .errors import UpdateProjectAccessError
-from .models import Project, ProjectAccess, AccessRequest, ProjectAccessDetail
+from .models import (
+    Project,
+    ProjectAccess,
+    AccessRequest,
+    ProjectAccessDetail,
+    ProjectVersion,
+)
 from .permissions import projects_query, ProjectPermissions
 from .public_api_controller import parse_project_access_update_request
 from .. import db
@@ -248,6 +254,21 @@ def filter_projects(
     def workspace_count():
         return 1
 
+    @staticmethod
+    def monthly_contributors_count():
+        today = datetime.now(timezone.utc)
+        year = today.year
+        month = today.month
+        return (
+            db.session.query(ProjectVersion.author_id)
+            .filter(
+                extract("year", ProjectVersion.created) == year,
+                extract("month", ProjectVersion.created) == month,
+            )
+            .group_by(ProjectVersion.author_id)
+            .count()
+        )
+
     def projects_query(self, name=None, workspace=None):
         ws = self.factory_method()
         query = db.session.query(
diff --git a/server/mergin/tests/test_statistics.py b/server/mergin/tests/test_statistics.py
index b952039b..f076d882 100644
--- a/server/mergin/tests/test_statistics.py
+++ b/server/mergin/tests/test_statistics.py
@@ -46,10 +46,12 @@ def test_send_statistics(app, caplog):
             "workspaces_count",
             "last_change",
             "server_version",
+            "monthly_contributors",
         }
         assert data["workspaces_count"] == 1
         assert data["service_uuid"] == app.config["SERVICE_ID"]
         assert data["licence"] == "ce"
+        assert data["monthly_contributors"] == 1
 
         # repeated action does not do anything
         task = send_statistics.s().apply()
diff --git a/server/mergin/tests/test_workspace.py b/server/mergin/tests/test_workspace.py
index 33b53bcb..e273d2f1 100644
--- a/server/mergin/tests/test_workspace.py
+++ b/server/mergin/tests/test_workspace.py
@@ -56,7 +56,8 @@ def test_workspace_implementation(client):
         diff=null(),
         change=PushChangeType.CREATE,
     )
-    file_history.version = project.get_latest_version()
+    latest_version = project.get_latest_version()
+    file_history.version = latest_version
     file_history.project_version_name = file_history.version.name
     default_project_usage = ws.disk_usage()
     db.session.add(file_history)
@@ -69,6 +70,19 @@ def test_workspace_implementation(client):
     db.session.commit()
     assert ws.disk_usage() == default_project_usage
 
+    current_time = datetime.datetime.now(datetime.timezone.utc)
+    latest_version.created = datetime.datetime.combine(
+        current_time.replace(day=1), datetime.time.max
+    ) - datetime.timedelta(days=1)
+    db.session.commit()
+    assert handler.monthly_contributors_count() == 1
+
+    # test group by author_id
+    create_project("test_second_project", ws, user)
+    latest_version.created = current_time
+    db.session.commit()
+    assert handler.monthly_contributors_count() == 2
+
 
 def test_workspace(client):
     """Test get global workspace"""
diff --git a/server/mergin/tests/utils.py b/server/mergin/tests/utils.py
index 121acf2f..a9743920 100644
--- a/server/mergin/tests/utils.py
+++ b/server/mergin/tests/utils.py
@@ -182,7 +182,6 @@ def initialize():
             "added": project_files,
             "updated": [],
             "removed": [],
-            "renamed": [],
         }
     )
     pv = ProjectVersion(p, 1, user.id, upload_changes, "127.0.0.1")