diff --git a/docs/conf.py b/docs/conf.py
index 7c137f7..21d45d7 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -25,7 +25,7 @@
 import geometer
 
 project = "geometer"
-copyright = "2023, Jan Müller"
+copyright = "2024, Jan Müller"
 author = "Jan Müller"
 
 # The short X.Y version
diff --git a/pyproject.toml b/pyproject.toml
index 68f52dd..2a161f0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ classifiers = [
     "Programming Language :: Python :: Implementation :: PyPy",
 ]
 dependencies = [
-    "numpy>=1.22"
+    "numpy>=1.22,<2.0"
 ]
 
 [project.optional-dependencies]