diff --git a/cirq-rigetti/requirements.txt b/cirq-rigetti/requirements.txt
index cd1d90cc46c..13fc44d6572 100644
--- a/cirq-rigetti/requirements.txt
+++ b/cirq-rigetti/requirements.txt
@@ -1 +1 @@
-pyquil~=3.2.0
+pyquil>=3.2.0,<4.0.0