diff --git a/cirq-core/requirements.txt b/cirq-core/requirements.txt
index 9bd4633f3e8..9f29aa8b04c 100644
--- a/cirq-core/requirements.txt
+++ b/cirq-core/requirements.txt
@@ -4,7 +4,7 @@ duet>=0.2.8
 matplotlib~=3.0
 # Temporary fix for https://github.com/sympy/sympy/issues/26273
 # TODO: remove once `pip install --pre sympy` works in a fresh environment
-mpmath<=1.3.*
+mpmath<1.4
 networkx>=2.4
 numpy~=1.16
 pandas