diff --git a/sachet/server/users/views.py b/sachet/server/users/views.py
index 48b218a..a500e39 100644
--- a/sachet/server/users/views.py
+++ b/sachet/server/users/views.py
@@ -123,7 +123,7 @@ class UserAPI(MethodView):
     def patch(user, self, username):
         patch_user = User.query.filter_by(username=username).first()
 
-        if Permissions.ADMIN not in user.permissions:
+        if not patch_user or Permissions.ADMIN not in user.permissions:
             resp = {
                 "status": "fail",
                 "message": "You are not authorized to access this page."
@@ -152,8 +152,38 @@ class UserAPI(MethodView):
         }
         return jsonify(resp), 200
 
+    @auth_required
+    def put(user, self, username):
+        put_user = User.query.filter_by(username=username).first()
+
+        if not put_user or Permissions.ADMIN not in user.permissions:
+            resp = {
+                "status": "fail",
+                "message": "You are not authorized to access this page."
+            }
+            return jsonify(resp), 403
+
+        new_json = request.get_json()
+
+        try:
+            deserialized = user_schema.load(new_json)
+        except ValidationError as e:
+            resp = {
+                "status": "fail",
+                "message": f"Invalid data: {str(e)}"
+            }
+            return jsonify(resp), 400
+
+        for k, v in deserialized.items():
+            setattr(put_user, k, v)
+
+        resp = {
+            "status": "success",
+        }
+        return jsonify(resp), 200
+
 users_blueprint.add_url_rule(
     "/users/<username>",
     view_func=UserAPI.as_view("user_api"),
-    methods=['GET', 'PATCH']
+    methods=['GET', 'PATCH', 'PUT']
 )
diff --git a/tests/test_userinfo.py b/tests/test_userinfo.py
index effaca0..343cd61 100644
--- a/tests/test_userinfo.py
+++ b/tests/test_userinfo.py
@@ -1,6 +1,9 @@
 import pytest
 from bitmask import Bitmask
-from sachet.server.models import Permissions
+from sachet.server.models import Permissions, UserSchema
+from datetime import datetime
+
+user_schema = UserSchema()
 
 def test_get(client, tokens, validate_info):
     """Test accessing the user information endpoint as a normal user."""
@@ -92,3 +95,42 @@ def test_patch(client, users, tokens, validate_info):
     )
     assert resp.status_code == 200
     validate_info("jeff", resp.get_json())
+
+def test_put(client, users, tokens, validate_info):
+    """Test replacing user information as an administrator."""
+
+    # try with regular user to make sure it doesn't work
+    resp = client.patch(
+        "/users/jeff",
+        json = dict(),
+        headers={
+            "Authorization": f"bearer {tokens['jeff']}"
+        }
+    )
+    assert resp.status_code == 403
+
+    new_data = {k:v for k, v in users["jeff"].items()}
+    new_data["permissions"] = Bitmask(Permissions.ADMIN)
+    new_data["register_date"] = datetime(2022,2,2,0,0,0)
+
+    resp = client.put(
+        "/users/jeff",
+        json = user_schema.dump(new_data),
+        headers={
+            "Authorization": f"bearer {tokens['administrator']}"
+        }
+    )
+    assert resp.status_code == 200
+
+    # modify the expected values
+    users["jeff"]["permissions"] = Bitmask(Permissions.ADMIN)
+
+    # request new info
+    resp = client.get(
+        "/users/jeff",
+        headers={
+            "Authorization": f"bearer {tokens['jeff']}"
+        }
+    )
+    assert resp.status_code == 200
+    validate_info("jeff", resp.get_json())