diff --git a/orm/__init__.py b/orm/__init__.py
index d2e94d21..a15a6561 100644
--- a/orm/__init__.py
+++ b/orm/__init__.py
@@ -16,5 +16,5 @@ Operation.init_table()
 Resource.init_table()
 
 with local_session() as session:
-	rating_storage = ShoutRatingStorage(session)
+	ShoutRatingStorage.init(session)
 	ShoutViewStorage.init(session)
diff --git a/orm/shout.py b/orm/shout.py
index ce26bceb..56b03da7 100644
--- a/orm/shout.py
+++ b/orm/shout.py
@@ -43,21 +43,30 @@ class ShoutRating(Base):
 
 class ShoutRatingStorage:
 
-	def __init__(self, session):
-		self.ratings = session.query(ShoutRating).all()
+	ratings = []
 
-	def get_rating(self, shout_id):
-		shout_ratings = list(filter(lambda x: x.shout_id == shout_id, self.ratings))
+	lock = asyncio.Lock()
+
+	@staticmethod
+	def init(session):
+		ShoutRatingStorage.ratings = session.query(ShoutRating).all()
+
+	@staticmethod
+	async def get_rating(shout_id):
+		async with ShoutRatingStorage.lock:
+			shout_ratings = list(filter(lambda x: x.shout_id == shout_id, ShoutRatingStorage.ratings))
 		return reduce((lambda x, y: x + y.value), shout_ratings, 0)
 
-	def update_rating(self, new_rating):
-		rating = next((x for x in self.ratings \
-			if x.rater_id == new_rating.rater_id and x.shout_id == new_rating.shout_id), None)
-		if rating:
-			rating.value = new_rating.value
-			rating.ts = new_rating.ts
-		else:
-			self.ratings.append(new_rating)
+	@staticmethod
+	async def update_rating(new_rating):
+		async with ShoutRatingStorage.lock:
+			rating = next((x for x in ShoutRatingStorage.ratings \
+				if x.rater_id == new_rating.rater_id and x.shout_id == new_rating.shout_id), None)
+			if rating:
+				rating.value = new_rating.value
+				rating.ts = new_rating.ts
+			else:
+				ShoutRatingStorage.ratings.append(new_rating)
 
 
 class ShoutViewByDay(Base):
diff --git a/resolvers/zine.py b/resolvers/zine.py
index 7703bd24..0e9fa89e 100644
--- a/resolvers/zine.py
+++ b/resolvers/zine.py
@@ -1,5 +1,5 @@
 from orm import Shout, ShoutAuthor, ShoutTopic, ShoutRating, ShoutViewByDay, User, Community, Resource,\
-	rating_storage, ShoutViewStorage
+	ShoutRatingStorage, ShoutViewStorage
 from orm.base import local_session
 
 from resolvers.base import mutation, query
@@ -280,7 +280,7 @@ async def rate_shout(_, info, shout_id, value):
 				value = value
 			)
 
-	rating_storage.update_rating(rating)
+	await ShoutRatingStorage.update_rating(rating)
 
 	return {"error" : ""}
 
@@ -299,6 +299,6 @@ async def get_shout_by_slug(_, info, slug):
 		shout = session.query(Shout).\
 			options(select_options).\
 			filter(Shout.slug == slug).first()
-	shout.rating = rating_storage.get_rating(shout.id)
+	shout.rating = await ShoutRatingStorage.get_rating(shout.id)
 	shout.views = await ShoutViewStorage.get_view(shout.id)
 	return shout