diff --git a/requirements.txt b/requirements.txt
index 97c2024764715d0a715520800e2e1dd467183479..58566fd0c9ef8411e241dabb401db9c4ee16d424 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-git+https://github.com/inducer/pytools.git
+git+https://gitlab.tiker.net/inducer/pytools.git@cached-hash-on-immutable-record
 git+https://github.com/inducer/islpy.git
 git+https://github.com/inducer/cgen.git
 git+https://github.com/inducer/pyopencl.git