diff --git a/requirements.txt b/requirements.txt
index cd9b67cf4e0e744668b3ef0ae2f2b494d9c2c6e0..89b799259e11c750082700dc0d2818eb753303a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 git+https://github.com/inducer/pytools.git
-git+https://github.com/inducer/islpy.git
+git+https://gitlab.tiker.net/inducer/islpy.git@revert-cffi-go-to-pybind
 git+https://github.com/inducer/cgen.git
 git+https://github.com/inducer/pyopencl.git
 git+https://github.com/inducer/pymbolic.git