diff --git a/hasura/migrations/1614278149225_lowercase_player_username/up.sql b/hasura/migrations/1614278149225_lowercase_player_username/up.sql
new file mode 100644
index 00000000..9899d658
--- /dev/null
+++ b/hasura/migrations/1614278149225_lowercase_player_username/up.sql
@@ -0,0 +1 @@
+UPDATE player SET username=lower(username);
diff --git a/packages/web/components/Setup/SetupUsername.tsx b/packages/web/components/Setup/SetupUsername.tsx
index b8a27dcb..bf96af88 100644
--- a/packages/web/components/Setup/SetupUsername.tsx
+++ b/packages/web/components/Setup/SetupUsername.tsx
@@ -5,7 +5,7 @@ import { useUpdatePlayerUsernameMutation } from 'graphql/autogen/types';
 import { useUser } from 'lib/hooks';
 import React, { useEffect, useState } from 'react';
 
-const USERNAME_REGEX = /^[a-zA-Z0-9](_(?!(\.|_))|\.(?!(_|\.))|[a-zA-Z0-9]){2,18}[a-zA-Z0-9]$/;
+const USERNAME_REGEX = /^[a-z0-9](_(?!(\.|_))|\.(?!(_|\.))|[a-z0-9]){2,18}[a-z0-9]$/;
 
 export type SetupUsernameProps = {
   username: string;