diff --git a/src/openqaoa-pyquil/requirements.txt b/src/openqaoa-pyquil/requirements.txt
index cde21f45..19adc00d 100644
--- a/src/openqaoa-pyquil/requirements.txt
+++ b/src/openqaoa-pyquil/requirements.txt
@@ -1 +1 @@
-pyquil>=3.1.0
\ No newline at end of file
+pyquil>=3.1.0,<4.0.0
\ No newline at end of file