diff --git a/requirements.txt b/requirements.txt
index 807473ee94f9fe1b058d79f4a1db31772f4fbe4e..a9cf2c76ed9eea4972066223ea89d2c20a4859c2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 git+https://github.com/inducer/pytools.git#egg=pytools >= 2021.1
+git+https://github.com/inducer/pymbolic.git#egg=pymbolic
 git+https://github.com/inducer/genpy.git#egg=genpy
 git+https://github.com/inducer/loopy.git#egg=loopy