@@ -1,8 +1,8 @@
 from __future__ import print_function
 import os
-import pkg_resources
 import tempfile
 import subprocess
+from importlib import metadata
 import openpathsampling.version
 
 import argparse
@@ -23,10 +23,11 @@
     # PREFIX = openpathsampling.version.short_version
 
 def is_s3cmd_installed():
-    dists = pkg_resources.working_set
-    if not any(d.project_name == 's3cmd' for d in dists):
+    try:
+        metadata.distribution('s3cmd')
+    except metadata.PackageNotFoundError as exc:
         raise ImportError('The s3cmd package is required. '
-                          'try $ pip install s3cmd')
+                          'try $ pip install s3cmd') from exc
 
 def run_cmd(template, config_filename, dry=False):
     cmd = template.format(
@@ -73,4 +74,3 @@ def run_cmd(template, config_filename, dry=False):
             #config=f.name,
             #bucket=BUCKET_NAME)
     #return_val = subprocess.call(cmd.split())
-
@@ -15,9 +15,9 @@
 import sys
 import os
 import shutil
+from importlib.metadata import PackageNotFoundError, version as get_version
 
 # we use these to get the version
-import pkg_resources
 import packaging.version
 
 import openpathsampling
@@ -136,7 +136,10 @@ def gen_cli_docs(config_file, stdout=False):
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-release = pkg_resources.get_distribution('openpathsampling').version
+try:
+    release = get_version('openpathsampling')
+except PackageNotFoundError:
+    release = openpathsampling.version.version
 # The short X.Y version.
 # version = packaging.version.Version(release).base_version
 version = release  # prefer to have the .dev0 label on 'latest'
 
@@ -5,8 +5,8 @@
 @author David W.H. Swenson
 """
 
-import os
 from functools import wraps
+from importlib.resources import files
 from openpathsampling.engines import NoEngine
 import numpy as np
 import numpy.testing as npt
@@ -19,8 +19,6 @@
 except ImportError:
     md = None
 
-from pkg_resources import resource_filename
-
 import openpathsampling as paths
 import openpathsampling.engines.openmm as peng
 import openpathsampling.engines.toy as toys
@@ -178,8 +176,7 @@ def prepend_exception_message(e, failmsg):
         e.args = tuple([arg0] + list(e.args[1:]))
 
 def data_filename(fname, subdir='test_data'):
-    return resource_filename('openpathsampling',
-                             os.path.join('tests', subdir, fname))
+    return str(files('openpathsampling.tests').joinpath(subdir, fname))
 
 def true_func(value, *args, **kwargs):
     return True