diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index de00b365..fd64b14e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -26,7 +26,7 @@ jobs:
     uses: asottile/workflows/.github/workflows/tox.yml@v1.8.1
     with:
       env: '["py310"]'
-      os: macos-13
+      os: macos-15-intel
       wheel-tags: true
       submodules: true
   main-linux:
diff --git a/sassutils/wsgi.py b/sassutils/wsgi.py
index d29fa824..72d3eb13 100644
--- a/sassutils/wsgi.py
+++ b/sassutils/wsgi.py
@@ -3,11 +3,10 @@
 
 """
 import collections.abc
+import importlib
 import logging
 import os.path
 
-from pkg_resources import resource_filename
-
 from .builder import Manifest
 from sass import CompileError
 
@@ -107,7 +106,9 @@ def __init__(
         for package_name in self.manifests:
             if package_name in self.package_dir:
                 continue
-            path = resource_filename(package_name, '')
+            path = os.path.dirname(
+                importlib.import_module(package_name).__file__,
+            )
             self.package_dir[package_name] = path
         self.paths = []
         for package_name, manifest in self.manifests.items():