diff --git a/doc/requirements.txt b/doc/requirements.txt
index f59c8ac3b..d593ca985 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,5 +1,5 @@
 # dependencies to run larray tutorials (via nbsphinx)
-numpy >=1.22
+numpy >=1.22, <2.0.0
 pandas >=0.20
 matplotlib
 tables  # ==pytables