diff --git a/.gitignore b/.gitignore
index e3b0198..b3ec727 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,6 +5,8 @@
 .coverage
 .idea/
 .ropeproject/
+/.*_cache/
+/.python-version
 /.tox/
 __pycache__/
 _build/
diff --git a/CHANGES.rst b/CHANGES.rst
index ca516fb..aba554e 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,9 @@ unreleased
 ----------
 
 * add development documentation in development.rst
+* use tox as test runner
+* add type annotations
+* fix Sphinx 6 deprecation warnings
 
 0.5.1 - 2021-09-04
 ------------------
diff --git a/DEVELOPMENT.rst b/DEVELOPMENT.rst
index b250698..36f4c37 100644
--- a/DEVELOPMENT.rst
+++ b/DEVELOPMENT.rst
@@ -11,7 +11,7 @@ Running test
 To install all dependencies and run the tests use::
 
     pipenv install --dev
-    pipenv run pytest
+    pipenv run tox
 
 Release a new version
 ---------------------
@@ -31,7 +31,7 @@ Start by deciding the new release number and perform the following steps:
   shortlog <previous_tag>..HEAD`` could help to create a good release tag
   message) ::
 
-     git tag -s -a 0.5.1
+     git tag -s -a <version>
 
 * build the release artifacts ::
 
diff --git a/Pipfile b/Pipfile
index 62eba84..b58f2ab 100644
--- a/Pipfile
+++ b/Pipfile
@@ -6,12 +6,11 @@ verify_ssl = true
 [dev-packages]
 coverage = "*"
 twine = "*"
-path = "*"
 pytest = "*"
+tox = "*"
+black = "*"
 
 [packages]
 jandd-sphinxext-ip = { path = ".", editable = true }
-Sphinx = ">=4"
+Sphinx = ">=5"
 docutils = "*"
-six = "*"
-ipcalc = ">=1.99"
diff --git a/Pipfile.lock b/Pipfile.lock
index ff3f2bc..25bf633 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "42b26ba248aaae2a674f504a4c99ee60192a57df80fb3d65b30d1b631df4fa4a"
+            "sha256": "845c2f660368ac0a26cd73d6ad9e2e5164014c5f1458797ad9258f23a3e71d1f"
         },
         "pipfile-spec": 6,
         "requires": {},
@@ -16,64 +16,145 @@
     "default": {
         "alabaster": {
             "hashes": [
-                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
-                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
+                "sha256:1ee19aca801bbabb5ba3f5f258e4422dfa86f82f3e9cefb0859b283cdd7f62a3",
+                "sha256:a27a4a084d5e690e16e01e03ad2b2e552c61a65469419b907243193de1a84ae2"
             ],
-            "version": "==0.7.12"
+            "markers": "python_version >= '3.6'",
+            "version": "==0.7.13"
         },
         "babel": {
             "hashes": [
-                "sha256:ab49e12b91d937cd11f0b67cb259a57ab4ad2b59ac7a3b41d6c06c0ac5b0def9",
-                "sha256:bc0c176f9f6a994582230df350aa6e05ba2ebe4b3ac317eab29d9be5d2768da0"
+                "sha256:1ad3eca1c885218f6dce2ab67291178944f810a10a9b5f3cb8382a5a232b64fe",
+                "sha256:5ef4b3226b0180dedded4229651c8b0e1a3a6a2837d45a073272f313e4cf97f6"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==2.9.1"
+            "markers": "python_version >= '3.6'",
+            "version": "==2.11.0"
         },
         "certifi": {
             "hashes": [
-                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
-                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
+                "sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3",
+                "sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18"
             ],
-            "version": "==2021.5.30"
+            "markers": "python_version >= '3.6'",
+            "version": "==2022.12.7"
         },
         "charset-normalizer": {
             "hashes": [
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-                "sha256:f23667ebe1084be45f6ae0538e4a5a865206544097e4e8bbcacf42cd02a348f3"
+                "sha256:00d3ffdaafe92a5dc603cb9bd5111aaa36dfa187c8285c543be562e61b755f6b",
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+                "sha256:e62164b50f84e20601c1ff8eb55620d2ad25fb81b59e3cd776a1902527a788af",
+                "sha256:e696f0dd336161fca9adbb846875d40752e6eba585843c768935ba5c9960722b",
+                "sha256:eaa379fcd227ca235d04152ca6704c7cb55564116f8bc52545ff357628e10602",
+                "sha256:ebea339af930f8ca5d7a699b921106c6e29c617fe9606fa7baa043c1cdae326f",
+                "sha256:f4c39b0e3eac288fedc2b43055cfc2ca7a60362d0e5e87a637beac5d801ef478",
+                "sha256:f5057856d21e7586765171eac8b9fc3f7d44ef39425f85dbcccb13b3ebea806c",
+                "sha256:f6f45710b4459401609ebebdbcfb34515da4fc2aa886f95107f556ac69a9147e",
+                "sha256:f97e83fa6c25693c7a35de154681fcc257c1c41b38beb0304b9c4d2d9e164479",
+                "sha256:f9d0c5c045a3ca9bedfc35dca8526798eb91a07aa7a2c0fee134c6c6f321cbd7",
+                "sha256:ff6f3db31555657f3163b15a6b7c6938d08df7adbfc9dd13d9d19edad678f1e8"
             ],
             "markers": "python_version >= '3'",
-            "version": "==2.0.4"
+            "version": "==3.0.1"
         },
         "docutils": {
             "hashes": [
-                "sha256:686577d2e4c32380bb50cbb22f575ed742d58168cee37e99117a854bcd88f125",
-                "sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61"
+                "sha256:33995a6753c30b7f577febfc2c50411fec6aac7f7ffeb7c4cfe5991072dcf9e6",
+                "sha256:5e1de4d849fee02c63b040a4a3fd567f4ab104defd8a5511fbbc24a8a017efbc"
             ],
             "index": "pypi",
-            "version": "==0.17.1"
+            "version": "==0.19"
         },
         "idna": {
             "hashes": [
-                "sha256:14475042e284991034cb48e06f6851428fb14c4dc953acd9be9a5e95c7b6dd7a",
-                "sha256:467fbad99067910785144ce333826c71fb0e63a425657295239737f7ecd125f3"
+                "sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4",
+                "sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2"
             ],
-            "markers": "python_version >= '3'",
-            "version": "==3.2"
+            "markers": "python_version >= '3.5'",
+            "version": "==3.4"
         },
         "imagesize": {
             "hashes": [
-                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
-                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
+                "sha256:0d8d18d08f840c19d0ee7ca1fd82490fdc3729b7ac93f49870406ddde8ef8d8b",
+                "sha256:69150444affb9cb0d5cc5a92b3676f0b2fb7cd9ae39e947a5e11a36b4497cd4a"
             ],
             "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==1.2.0"
-        },
-        "ipcalc": {
-            "hashes": [
-                "sha256:17b9d85859ef70e1996426a723d3891f6b99dd0e283986ea92c37a06601725d9"
-            ],
-            "index": "pypi",
-            "version": "==1.99.0"
+            "version": "==1.4.1"
         },
         "jandd-sphinxext-ip": {
             "editable": true,
@@ -81,141 +162,121 @@
         },
         "jinja2": {
             "hashes": [
-                "sha256:1f06f2da51e7b56b8f238affdd6b4e2c61e39598a378cc49345bc1bd42a978a4",
-                "sha256:703f484b47a6af502e743c9122595cc812b0271f661722403114f71a79d0f5a4"
+                "sha256:31351a702a408a9e7595a8fc6150fc3f43bb6bf7e319770cbc0db9df9437e852",
+                "sha256:6088930bfe239f0e6710546ab9c19c9ef35e29792895fed6e6e31a023a182a61"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==3.0.1"
+            "markers": "python_version >= '3.7'",
+            "version": "==3.1.2"
         },
         "markupsafe": {
             "hashes": [
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@@ -259,253 +320,478 @@
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             "hashes": [
                 "sha256:1e61c37477a1626458e36f7b1d82aa5c9b094fa4802892072e49de9c60c4c926",
                 "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"
             ],
-            "index": "pypi",
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
             "version": "==1.16.0"
         },
-        "toml": {
+        "tomli": {
             "hashes": [
-                "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b",
-                "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"
+                "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc",
+                "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"
             ],
-            "markers": "python_version >= '2.6' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==0.10.2"
+            "markers": "python_full_version < '3.11.0a7'",
+            "version": "==2.0.1"
         },
-        "tqdm": {
+        "tox": {
             "hashes": [
-                "sha256:80aead664e6c1672c4ae20dc50e1cdc5e20eeff9b14aa23ecd426375b28be588",
-                "sha256:a4d6d112e507ef98513ac119ead1159d286deab17dffedd96921412c2d236ff5"
+                "sha256:258895ba5de919490c03ef97467c4c8c42954537dfd96ae72cc2fb63dac67cf0",
+                "sha256:3d8a8dd8a5afdc0d37af3e2b4959e427fe22530d0aa599baf0120e144b3defa3"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'",
-            "version": "==4.62.2"
+            "index": "pypi",
+            "version": "==4.4.2"
         },
         "twine": {
             "hashes": [
-                "sha256:087328e9bb405e7ce18527a2dca4042a84c7918658f951110b38bc135acab218",
-                "sha256:4caec0f1ed78dc4c9b83ad537e453d03ce485725f2aea57f1bb3fdde78dae936"
+                "sha256:929bc3c280033347a00f847236564d1c52a3e61b1ac2516c97c48f3ceab756d8",
+                "sha256:9e102ef5fdd5a20661eb88fad46338806c3bd32cf1db729603fe3697b1bc83c8"
             ],
             "index": "pypi",
-            "version": "==3.4.2"
+            "version": "==4.0.2"
         },
         "urllib3": {
             "hashes": [
-                "sha256:39fb8672126159acb139a7718dd10806104dec1e2f0f6c88aab05d17df10c8d4",
-                "sha256:f57b4c16c62fa2760b7e3d97c35b255512fb6b59a259730f36ba32ce9f8e342f"
+                "sha256:076907bf8fd355cde77728471316625a4d2f7e713c125f51953bb5b3eecf4f72",
+                "sha256:75edcdc2f7d85b137124a6c3c9fc3933cdeaa12ecb9a6a959f22797a0feca7e1"
             ],
-            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'",
-            "version": "==1.26.6"
+            "markers": "python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4, 3.5'",
+            "version": "==1.26.14"
+        },
+        "virtualenv": {
+            "hashes": [
+                "sha256:ce3b1684d6e1a20a3e5ed36795a97dfc6af29bc3970ca8dab93e11ac6094b3c4",
+                "sha256:f8b927684efc6f1cc206c9db297a570ab9ad0e51c16fa9e45487d36d1905c058"
+            ],
+            "markers": "python_version >= '3.6'",
+            "version": "==20.17.1"
         },
         "webencodings": {
             "hashes": [
@@ -641,11 +938,11 @@
         },
         "zipp": {
             "hashes": [
-                "sha256:957cfda87797e389580cb8b9e3870841ca991e2125350677b2ca83a0e99390a3",
-                "sha256:f5812b1e007e48cff63449a5e9f4e7ebea716b4111f9c4f9a645f91d579bf0c4"
+                "sha256:73efd63936398aac78fd92b6f4865190119d6c91b531532e798977ea8dd402eb",
+                "sha256:9eb0a4c5feab9b08871db0d672745b53450d7f26992fd1e4653aa43345e97b86"
             ],
-            "markers": "python_version >= '3.6'",
-            "version": "==3.5.0"
+            "markers": "python_version >= '3.7'",
+            "version": "==3.12.0"
         }
     }
 }
diff --git a/jandd/__init__.py b/jandd/__init__.py
deleted file mode 100644
index 5284146..0000000
--- a/jandd/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__("pkg_resources").declare_namespace(__name__)
diff --git a/jandd/sphinxext/__init__.py b/jandd/sphinxext/__init__.py
deleted file mode 100644
index 5284146..0000000
--- a/jandd/sphinxext/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-__import__("pkg_resources").declare_namespace(__name__)
diff --git a/jandd/sphinxext/ip.py b/jandd/sphinxext/ip/__init__.py
similarity index 79%
rename from jandd/sphinxext/ip.py
rename to jandd/sphinxext/ip/__init__.py
index 856daf8..be0d62e 100644
--- a/jandd/sphinxext/ip.py
+++ b/jandd/sphinxext/ip/__init__.py
@@ -10,13 +10,15 @@
 """
 __version__ = "0.5.1"
 
+import ipaddress
 from collections import defaultdict
-from typing import Iterable, List, Optional, Tuple
+from typing import Iterable, List, Optional, Tuple, Any, cast
 
 from docutils import nodes
-from ipcalc import IP, Network
+from docutils.nodes import Element
 from sphinx import addnodes
 from sphinx.addnodes import desc_signature, pending_xref
+from sphinx.application import Sphinx
 from sphinx.builders import Builder
 from sphinx.directives import ObjectDescription, T
 from sphinx.domains import Domain, ObjType
@@ -39,32 +41,32 @@ class IPRangeDirective(ObjectDescription):
 
     has_content = True
     required_arguments = 1
-    title_prefix = None
-    range_spec = None
+    title_prefix: str = ""
+    range_spec: str = ""
 
     def get_title_prefix(self) -> str:
-        if self.title_prefix is None:
-            raise NotImplemented("subclasses must set title_prefix")
         return self.title_prefix
 
-    def handle_signature(self, sig: str, signode: desc_signature) -> T:
-        signode += addnodes.desc_name(text="{} {}".format(self.get_title_prefix(), sig))
+    def handle_signature(self, sig: str, sig_node: desc_signature) -> str:
+        sig_node += addnodes.desc_name(
+            text="{} {}".format(self.get_title_prefix(), sig)
+        )
         self.range_spec = sig
         return sig
 
-    def transform_content(self, contentnode: addnodes.desc_content) -> None:
+    def transform_content(self, content_node: addnodes.desc_content) -> None:
         ip_range_node = ip_range()
         ip_range_node["range_spec"] = self.range_spec
-        contentnode += ip_range_node
+        content_node += ip_range_node
 
 
 class IPV4RangeDirective(IPRangeDirective):
     title_prefix = _("IPv4 range")
 
-    def add_target_and_index(self, name: T, sig: str, signode: desc_signature) -> None:
+    def add_target_and_index(self, name: T, sig: str, sig_node: desc_signature) -> None:
         anchor = "ip-ipv4range-{0}".format(sig)
-        signode["ids"].append(anchor)
-        ips = self.env.get_domain("ip")
+        sig_node["ids"].append(anchor)
+        ips = cast(IPDomain, self.env.get_domain("ip"))
         ips.add_ip4_range(sig)
         idx_text = "{}; {}".format(self.title_prefix, name)
         self.indexnode["entries"] = [
@@ -78,7 +80,7 @@ class IPV6RangeDirective(IPRangeDirective):
     def add_target_and_index(self, name: T, sig: str, signode: desc_signature) -> None:
         anchor = "ip-ipv6range-{0}".format(sig)
         signode["ids"].append(anchor)
-        ips = self.env.get_domain("ip")
+        ips = cast(IPDomain, self.env.get_domain("ip"))
         ips.add_ip6_range(sig)
         idx_text = "{}; {}".format(self.title_prefix, name)
         self.indexnode["entries"] = [
@@ -101,7 +103,7 @@ class IPXRefRole(XRefRole):
     ) -> Tuple[str, str]:
         refnode.attributes.update(env.ref_context)
 
-        ips = env.get_domain("ip")
+        ips = cast(IPDomain, env.get_domain("ip"))
         if refnode["reftype"] == "v4":
             ips.add_ip4_address_reference(target)
         elif refnode["reftype"] == "v6":
@@ -122,7 +124,7 @@ class IPXRefRole(XRefRole):
     ) -> Tuple[List[nodes.Node], List[nodes.system_message]]:
         node_list, message = super().result_nodes(document, env, node, is_ref)
 
-        ip = env.get_domain("ip")
+        ip = cast(IPDomain, env.get_domain("ip"))
         if self.reftype in ["v4", "v6"] and self.target not in ip.data["ip_dict"]:
             return node_list, message
         if (
@@ -138,7 +140,7 @@ class IPXRefRole(XRefRole):
             ip.add_ip_address_anchor(self.target, env.docname, target_id)
 
         target_node = nodes.target("", "", ids=[target_id])
-        doc_title = next(d for d in document.traverse(nodes.title)).astext()
+        doc_title = next(d for d in document.findall(nodes.title)).astext()
 
         node_text = node.astext()
 
@@ -157,6 +159,25 @@ class IPXRefRole(XRefRole):
 class IPDomain(Domain):
     """Custom domain for IP addresses and ranges."""
 
+    def merge_domaindata(self, docnames: list[str], otherdata: dict) -> None:
+        # TODO: implement merge_domaindata
+        print(
+            f"merge_domaindata called for docnames: {docnames} with otherdata: {otherdata}"
+        )
+
+    def resolve_any_xref(
+        self,
+        env: BuildEnvironment,
+        fromdocname: str,
+        builder: Builder,
+        target: str,
+        node: pending_xref,
+        contnode: Element,
+    ) -> list[tuple[str, Element]]:
+        # TODO: implement resolve_any_xref
+        print("resolve_any_xref called")
+        return []
+
     name = "ip"
     label = "IP addresses and ranges."
 
@@ -194,23 +215,23 @@ class IPDomain(Domain):
         for obj in self.data["range_nodes"]:
             yield obj
 
-    def add_ip4_range(self, sig: desc_signature):
+    def add_ip4_range(self, sig: str):
         logger.debug("add_ip4_range: %s", sig)
         self._add_ip_range("v4", sig)
 
-    def add_ip6_range(self, sig: desc_signature):
+    def add_ip6_range(self, sig: str):
         logger.debug("add_ip6_range: %s", sig)
         self._add_ip_range("v6", sig)
 
-    def _add_ip_range(self, family: str, sig: desc_signature):
+    def _add_ip_range(self, family: str, sig: str):
         name = "ip{}range.{}".format(family, sig)
         anchor = "ip-ip{}range-{}".format(family, sig)
         try:
-            ip_range = Network(sig)
+            new_ip_range = ipaddress.ip_network(sig)
             self.data["range_nodes"].append(
                 (name, family, sig, self.env.docname, anchor, 0)
             )
-            self.data["ranges"][sig].append((ip_range, self.env.docname, anchor))
+            self.data["ranges"][sig].append((new_ip_range, self.env.docname, anchor))
         except ValueError as e:
             logger.error("invalid ip range address '%s': %s", sig, e)
 
@@ -224,13 +245,13 @@ class IPDomain(Domain):
 
     def _add_ip_address_reference(self, family, sig):
         try:
-            self.data["ip_dict"][sig] = IP(sig)
+            self.data["ip_dict"][sig] = ipaddress.ip_address(sig)
         except ValueError as e:
             logger.error("invalid ip address '%s': %s", sig, e)
 
     def add_ip_address_anchor(self, sig, docname, anchor):
         try:
-            ip = IP(sig)
+            ip = ipaddress.ip_address(sig)
             self.data["ip_refs"][sig].append((ip, docname, anchor))
         except ValueError as e:
             logger.error("invalid ip address '%s': %s", sig, e)
@@ -247,7 +268,7 @@ class IPDomain(Domain):
         name = "iprange{}.{}".format(family, sig)
         anchor = "ip-iprange{}-{}".format(family, sig)
         try:
-            ip_range = Network(sig)
+            ip_range = ipaddress.ip_network(sig)
             self.data["range_refs"].append(
                 (
                     name,
@@ -274,15 +295,11 @@ class IPDomain(Domain):
     ) -> Optional[nodes.Element]:
         match = []
 
-        def address_tuple(docname, anchor, ip_range) -> Tuple[str, str, str]:
+        def address_tuple(docname, anchor, ip_range: Any) -> Tuple[str, str, str]:
             return (
                 docname,
                 anchor,
-                _(
-                    "IPv{0} range {1}".format(
-                        ip_range.version(), ip_range.to_compressed()
-                    )
-                ),
+                _("IPv{0} range {1}".format(ip_range.version, ip_range.compressed)),
             )
 
         if typ in ("v4", "v6"):
@@ -318,26 +335,26 @@ class IPDomain(Domain):
         return None
 
 
-def process_ip_nodes(app, doctree, fromdocname):
+def process_ip_nodes(app: Sphinx, doctree: nodes.Node, fromdocname: str):
     env = app.builder.env
     ips = env.get_domain(IPDomain.name)
 
     header = (_("IP address"), _("Used by"))
     column_widths = (2, 5)
 
-    for node in doctree.traverse(ip_range):
+    for node in doctree.findall(ip_range):
         content = []
-        net = Network(node["range_spec"])
+        net = ipaddress.ip_network(node["range_spec"], strict=False)
         addresses = defaultdict(list)
         for ip_address_sig, refs in ips.data["ip_refs"].items():
-            for ip_address, todocname, anchor in refs:
+            for ip_address, to_doc_name, anchor in refs:
                 if ip_address in net:
-                    addresses[ip_address_sig].append((ip_address, todocname, anchor))
+                    addresses[ip_address_sig].append((ip_address, to_doc_name, anchor))
                     logger.debug(
                         "found %s in network %s on %s",
                         ip_address_sig,
-                        net.to_compressed(),
-                        todocname,
+                        net.compressed,
+                        to_doc_name,
                     )
         if addresses:
             table = nodes.table()
@@ -360,30 +377,30 @@ def process_ip_nodes(app, doctree, fromdocname):
                 (key, addresses[key]) for key in sorted(addresses, key=sort_by_ip)
             ]:
                 para = nodes.paragraph()
-                para += nodes.literal("", ip_info[0][0].to_compressed())
+                para += nodes.literal("", ip_info[0][0].compressed)
 
                 ref_node = nodes.paragraph()
                 ref_nodes = []
                 referenced_docs = set()
 
                 for item in ip_info:
-                    ip_address, todocname, anchor = item
-                    if todocname in referenced_docs:
+                    ip_address, to_doc_name, anchor = item
+                    if to_doc_name in referenced_docs:
                         continue
-                    referenced_docs.add(todocname)
+                    referenced_docs.add(to_doc_name)
 
-                    title = env.titles[todocname]
-                    innernode = nodes.Text(title.astext())
-                    newnode = make_refnode(
+                    title = env.titles[to_doc_name]
+                    inner_node = nodes.Text(title.astext())
+                    new_node = make_refnode(
                         app.builder,
                         fromdocname,
-                        todocname,
+                        to_doc_name,
                         anchor,
-                        innernode,
+                        inner_node,
                         title.astext(),
                     )
 
-                    ref_nodes.append(newnode)
+                    ref_nodes.append(new_node)
                 for count in range(len(ref_nodes)):
                     ref_node.append(ref_nodes[count])
                     if count < len(ref_nodes) - 1:
@@ -407,10 +424,10 @@ def create_table_row(rowdata):
 
 
 def sort_by_ip(item):
-    return IP(item).ip
+    return ipaddress.ip_address(item)
 
 
-def setup(app):
+def setup(app: Sphinx):
     app.add_domain(IPDomain)
     app.connect("doctree-resolved", process_ip_nodes)
     return {
diff --git a/setup.cfg b/setup.cfg
index cbd92d8..84a318b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -15,7 +15,7 @@ author = Jan Dittberner
 author_email = jan@dittberner.info
 keywords = sphinx, extension, IP
 license = GPLv3+
-license_file = COPYING
+license_files = COPYING
 platforms = any
 version = 0.5.1
 classifiers =
@@ -31,8 +31,4 @@ zip_safe = False
 include_package_data = True
 packages = find:
 install_requires =
-    Sphinx >= 4
-    ipcalc >= 1.99
-namespace_packages =
-    jandd
-    jandd.sphinxext
+    Sphinx >= 5
diff --git a/tests/root/conf.py b/tests/root/conf.py
index c04743a..45af363 100644
--- a/tests/root/conf.py
+++ b/tests/root/conf.py
@@ -12,14 +12,14 @@
 #
 # All configuration values have a default; values that are commented out
 # serve to show the default.
-
-# import sys
-# import os
+import os
+import sys
+from typing import Dict
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-# sys.path.insert(0, os.path.abspath('..'))
+sys.path.insert(0, os.path.abspath(os.path.join("..", "..")))
 
 # -- General configuration ------------------------------------------------
 
@@ -47,7 +47,7 @@ master_doc = "index"
 
 # General information about the project.
 project = "Sphinxext IP Tests"
-copyright = "2016-2021, Jan Dittberner"
+copyright = "2016-2023, Jan Dittberner"
 author = "Jan Dittberner"
 
 # The version info for the project you're documenting, acts as replacement for
@@ -104,7 +104,6 @@ pygments_style = "sphinx"
 # If true, `todo` and `todoList` produce output, else they produce nothing.
 todo_include_todos = False
 
-
 # -- Options for HTML output ----------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for
@@ -207,15 +206,15 @@ htmlhelp_basename = "SphinxextIPTestsdoc"
 
 # -- Options for LaTeX output ---------------------------------------------
 
-latex_elements = {
+latex_elements: Dict[str, str] = {
     # The paper size ('letterpaper' or 'a4paper').
-    #'papersize': 'letterpaper',
+    # 'papersize': 'letterpaper',
     # The font size ('10pt', '11pt' or '12pt').
-    #'pointsize': '10pt',
+    # 'pointsize': '10pt',
     # Additional stuff for the LaTeX preamble.
-    #'preamble': '',
+    # 'preamble': '',
     # Latex figure (float) alignment
-    #'figure_align': 'htbp',
+    # 'figure_align': 'htbp',
 }
 
 # Grouping the document tree into LaTeX files. List of tuples
diff --git a/tests/test_ip.py b/tests/test_ip.py
index 082ee67..a11d2f6 100644
--- a/tests/test_ip.py
+++ b/tests/test_ip.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-
+import shutil
 import unittest
 from io import StringIO
 
@@ -23,7 +23,7 @@ class TestIPExtension(unittest.TestCase):
 
     def tearDown(self):
         self.app.cleanup()
-        (test_root / "_build").rmtree(True)
+        shutil.rmtree((test_root / "_build"))
 
     def test_ip_domaindata(self):
         self.assertIn("ip", self.app.env.domaindata)
diff --git a/tests/util.py b/tests/util.py
index a8fb2ed..c21970c 100644
--- a/tests/util.py
+++ b/tests/util.py
@@ -12,8 +12,8 @@ import shutil
 import sys
 import tempfile
 from functools import wraps
+from pathlib import Path
 
-from path import Path
 from sphinx import application
 
 __all__ = [
@@ -25,14 +25,13 @@ __all__ = [
     "SphinxTestApplication",
     "with_app",
     "gen_with_app",
-    "Path",
     "with_tempdir",
     "write_file",
     "sprint",
 ]
 
 
-test_root = Path(__file__).parent.joinpath("root").abspath()
+test_root = Path(__file__).parent.joinpath("root").absolute()
 
 
 def _excstr(exc):
@@ -96,9 +95,9 @@ class SphinxTestApplication(application.Sphinx):
 
     def __init__(
         self,
-        srcdir=None,
+        src_dir=None,
         confdir=None,
-        outdir=None,
+        out_dir=None,
         doctreedir=None,
         buildername="html",
         confoverrides=None,
@@ -115,26 +114,26 @@ class SphinxTestApplication(application.Sphinx):
 
         self.cleanup_trees = [test_root / "generated"]
 
-        if srcdir is None:
-            srcdir = test_root
-        if srcdir == "(temp)":
+        if src_dir is None:
+            src_dir = test_root
+        if src_dir == "(temp)":
             tempdir = Path(tempfile.mkdtemp())
             self.cleanup_trees.append(tempdir)
-            temproot = tempdir / "root"
-            test_root.copytree(temproot)
-            srcdir = temproot
+            temp_root = tempdir / "root"
+            shutil.copytree(test_root.resolve(), temp_root.resolve())
+            src_dir = temp_root
         else:
-            srcdir = Path(srcdir)
-        self.builddir = srcdir.joinpath("_build")
+            src_dir = Path(src_dir)
+        self.builddir = src_dir.joinpath("_build")
         if confdir is None:
-            confdir = srcdir
-        if outdir is None:
-            outdir = srcdir.joinpath(self.builddir, buildername)
-            if not outdir.isdir():
-                outdir.makedirs()
-            self.cleanup_trees.insert(0, outdir)
+            confdir = src_dir
+        if out_dir is None:
+            out_dir = src_dir.joinpath(self.builddir, buildername)
+            if not out_dir.is_dir():
+                out_dir.mkdir(parents=True)
+            self.cleanup_trees.insert(0, out_dir)
         if doctreedir is None:
-            doctreedir = srcdir.joinpath(srcdir, self.builddir, "doctrees")
+            doctreedir = src_dir.joinpath(src_dir, self.builddir, "doctrees")
             if cleanenv:
                 self.cleanup_trees.insert(0, doctreedir)
         if confoverrides is None:
@@ -150,9 +149,9 @@ class SphinxTestApplication(application.Sphinx):
 
         application.Sphinx.__init__(
             self,
-            srcdir,
+            str(src_dir),
             confdir,
-            outdir,
+            out_dir,
             doctreedir,
             buildername,
             confoverrides,
@@ -211,7 +210,7 @@ def with_tempdir(func):
     def new_func():
         tempdir = Path(tempfile.mkdtemp())
         func(tempdir)
-        tempdir.rmtree()
+        tempdir.rmdir()
 
     new_func.__name__ = func.__name__
     return new_func
diff --git a/tox.ini b/tox.ini
new file mode 100644
index 0000000..85dac17
--- /dev/null
+++ b/tox.ini
@@ -0,0 +1,26 @@
+[tox]
+requires =
+    tox>=4
+env_list = lint, type, py{39,310,311,312}
+
+[testenv]
+description = run unit tests
+deps =
+    pytest>=7
+    pytest-sugar
+commands =
+    pytest {posargs:tests}
+
+[testenv:lint]
+description = run linters
+skip_install = true
+deps =
+    black==22.12
+commands = black {posargs:.}
+
+[testenv:type]
+description = run type checks
+deps =
+    mypy>=0.991
+commands =
+    mypy {posargs:--install-types --non-interactive jandd tests}