diff --git a/requirements.txt b/requirements.txt
index abe39e8935e461184ed65898c568e8697162594b..e28502fbb5b4b473ff6e0c34c0b3d1c9aed2d42f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,3 +5,5 @@ git+https://github.com/pyopencl/pyopencl
 git+https://github.com/inducer/boxtree
 git+https://github.com/inducer/loopy
 git+https://github.com/inducer/pyfmmlib
+# The pymbolic version needs SymEngine support
+git+https://github.com/inducer/pymbolic@081714baf4476b42ca75a1324377914dd6356965