diff --git a/requirements.txt b/requirements.txt
index 4ed819eb75a..9bd4633f3e8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,9 @@
 
 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.*
 networkx>=2.4
 numpy~=1.16
 pandas