diff --git a/noxfile.py b/noxfile.py
index cd1a556..55574d3 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -45,9 +45,9 @@ def unit(session):
     'install',
     [
         'Jinja2==3.0.0',
-        'Pillow==8.3.2',  # Oldest version that supports Python 3.7 to 3.10.
-        'requests==2.22.0',
-        'xmldiff==2.4'
+        'Pillow==10.1',  # Oldest version that supports Python 3.12.
+        'requests==2.32.3',  # Oldest version that supports Python 3.12
+        'xmldiff==2.6' # Oldest version that supports Python 3.12
     ])
 def compatibility(session, install):
     """Run the unit test suite with each support library and Python version."""
diff --git a/pybadges/precalculated_text_measurer.py b/pybadges/precalculated_text_measurer.py
index 6e769af..737b6c5 100644
--- a/pybadges/precalculated_text_measurer.py
+++ b/pybadges/precalculated_text_measurer.py
@@ -18,7 +18,7 @@
 
 import io
 import json
-import pkg_resources
+import importlib.resources as resources
 from typing import cast, Mapping, TextIO, Type
 
 from pybadges import text_measurer
@@ -74,19 +74,23 @@ def default(cls) -> 'PrecalculatedTextMeasurer':
         if cls._default_cache is not None:
             return cls._default_cache
 
-        if pkg_resources.resource_exists(__name__, 'default-widths.json.xz'):
+        resource_name_xz = 'default-widths.json.xz'
+        resource_name_json = 'default-widths.json'
+
+        resource_package = resources.files(__name__)
+        resource_xz_path = resource_package / resource_name_xz
+        resource_json_path = resource_package / resource_name_json
+
+        if resource_xz_path.exists():
             import lzma
-            with pkg_resources.resource_stream(__name__,
-                                               'default-widths.json.xz') as f:
-                with lzma.open(f, "rt") as g:
-                    cls._default_cache = PrecalculatedTextMeasurer.from_json(
-                        cast(TextIO, g))
+            with resources.as_file(resource_xz_path) as path:
+                with lzma.open(path, "rt") as f:
+                    cls._default_cache = PrecalculatedTextMeasurer.from_json(cast(TextIO, f))
+                    return cls._default_cache
+        elif resource_json_path.exists():
+            with resources.as_file(resource_json_path) as path:
+                with open(path, 'r', encoding='utf-8') as f:
+                    cls._default_cache = PrecalculatedTextMeasurer.from_json(f)
                     return cls._default_cache
-        elif pkg_resources.resource_exists(__name__, 'default-widths.json'):
-            with pkg_resources.resource_stream(__name__,
-                                               'default-widths.json') as f:
-                cls._default_cache = PrecalculatedTextMeasurer.from_json(
-                    io.TextIOWrapper(f, encoding='utf-8'))
-                return cls._default_cache
         else:
             raise ValueError('could not load default-widths.json')
diff --git a/setup.py b/setup.py
index 88559b2..c6b9ca5 100644
--- a/setup.py
+++ b/setup.py
@@ -49,7 +49,6 @@ def replace_relative_with_absolute(match):
         'License :: OSI Approved :: Apache Software License',
         'Programming Language :: Python',
         'Programming Language :: Python :: 3',
-        'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3.9',
         'Programming Language :: Python :: 3.10',
@@ -67,17 +66,17 @@ def replace_relative_with_absolute(match):
     },
     long_description=get_long_description(),
     long_description_content_type='text/markdown',
-    python_requires='>=3.4',
-    install_requires=['Jinja2>=3,<4', 'requests>=2.22.0,<3'],
+    python_requires='>=3.8',
+    install_requires=['Jinja2>=3,<4', 'requests>=2.32.3,<3'],
     extras_require={
-        'pil-measurement': ['Pillow>=6,<10'],
+        'pil-measurement': ['Pillow>=10.1'],
         'dev': [
-            'Flask>=2.0',  # For server tests. 
+            'Flask>=2.0',  # For server tests.
             'fonttools>=3.26',
             'nox',
             'Pillow>=5',
             'pytest>=3.6',
-            'xmldiff>=2.4'
+            'xmldiff>=2.6'
         ],
     },
     license='Apache-2.0',