diff --git a/requirements.txt b/requirements.txt
index 9672411f9c7f9b44120b14b8c9bfcd6e46da05a3..5c120b3a1538ec10435bfddcbc3cea1731a02cf3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 numpy
+git+https://gitlab.tiker.net/inducer/pytools.git
 git+https://gitlab.tiker.net/inducer/gmsh_interop.git
 git+https://gitlab.tiker.net/inducer/modepy.git
 git+https://gitlab.tiker.net/inducer/pyopencl.git@better-empty-handling