diff --git a/migrations/cockroach/V1.1__eventstore.sql b/migrations/cockroach/V1.1__eventstore.sql
index 07eababf1..b4d86833a 100644
--- a/migrations/cockroach/V1.1__eventstore.sql
+++ b/migrations/cockroach/V1.1__eventstore.sql
@@ -7,6 +7,7 @@ GRANT UPDATE ON TABLE eventstore.event_seq TO auth;
 GRANT UPDATE ON TABLE eventstore.event_seq TO authz;
 GRANT UPDATE ON TABLE eventstore.event_seq TO notification;
 
+SET experimental_enable_hash_sharded_indexes = on;
 
 CREATE TABLE eventstore.events (
     id UUID DEFAULT gen_random_uuid(),
@@ -22,7 +23,7 @@ CREATE TABLE eventstore.events (
     editor_service TEXT NOT NULL,
     resource_owner TEXT NOT NULL,
 
-    CONSTRAINT event_sequence_pk PRIMARY KEY (event_sequence DESC),
+    CONSTRAINT event_sequence_pk PRIMARY KEY (event_sequence DESC) USING HASH WITH BUCKET_COUNT = 10,
     INDEX agg_type_agg_id (aggregate_type, aggregate_id),
     CONSTRAINT previous_sequence_unique UNIQUE (previous_sequence DESC)
 );