diff --git a/requirements.txt b/requirements.txt
index e1156822dabb2ce99bd5577d23d97cefd86c0f61..82b152f4f26745e3dc2419f34525701892d7e59b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-git+https://github.com/nchristensen/pytools.git#egg=pytools
+git+https://github.com/nchristensen/pytools.git#egg=pytools == 2020.4.4
 git+https://github.com/inducer/loopy.git#egg=loopy