diff --git a/requirements.txt b/requirements.txt
index d78f6a5a8fc6d80875aea61cdb076657a3234e5d..acd0138e7520c0973f0cec23992a9823df51e2ec 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 numpy
+git+https://github.com/inducer/pymbolic.git
 git+https://github.com/inducer/islpy.git
 git+https://github.com/pyopencl/pyopencl.git
 git+https://github.com/inducer/loopy.git