From d38f24a2477de17b3a39819bd3d847610e4a0fd1 Mon Sep 17 00:00:00 2001
From: Ryan Hill <ryanjh88@gmail.com>
Date: Tue, 11 Jun 2024 16:36:53 -0500
Subject: [PATCH] Update requirements.txt (#6633)

Require attrs>=21.3.0 to ensure `import attrs` works.
---
 cirq-core/requirements.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cirq-core/requirements.txt b/cirq-core/requirements.txt
index ef23cdf53de..b526c835455 100644
--- a/cirq-core/requirements.txt
+++ b/cirq-core/requirements.txt
@@ -1,6 +1,6 @@
 # Runtime requirements for the python 3 version of cirq.
 
-attrs
+attrs>=21.3.0
 duet>=0.2.8
 matplotlib~=3.0
 networkx>=2.4