diff --git a/pyirf/utils.py b/pyirf/utils.py
index a75eaeb98..d5ed730e5 100644
--- a/pyirf/utils.py
+++ b/pyirf/utils.py
@@ -1,6 +1,6 @@
 import numpy as np
 import astropy.units as u
-from astropy.coordinates.angle_utilities import angular_separation
+from astropy.coordinates import angular_separation
 
 from .exceptions import MissingColumns, WrongColumnUnit
 
diff --git a/pyproject.toml b/pyproject.toml
index 95c0fe5d2..62076e3a9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools >= 40.6.0", "setuptools_scm[toml]>=3.4"]
+requires = ["setuptools>=60", "setuptools-scm[toml]>=8.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.towncrier]
diff --git a/setup.py b/setup.py
index 0fb1a557a..e06b99820 100644
--- a/setup.py
+++ b/setup.py
@@ -46,9 +46,8 @@
     use_scm_version={"write_to": os.path.join("pyirf", "_version.py")},
     packages=find_packages(exclude=['pyirf._dev_version']),
     install_requires=[
-        "astropy>=5.3",
-        "matplotlib",
-        "numpy>=1.18",
+        "astropy>=5.3,<7.0.0a0",
+        "numpy>=1.21",
         "scipy",
         "tqdm",
     ],