diff --git a/requirements.txt b/requirements.txt
index 7548340edfd19dac98efa9e0cf19f80bb4259b95..5af50dd7a2258fb8d2d198e7ace09fb5bbff5022 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,2 +1,2 @@
-git+https://github.com/inducer/pytools.git#egg=pytools
+git+https://github.com/inducer/pytools.git#egg=pytools >= 2021.1
 git+https://github.com/inducer/loopy.git#egg=loopy