diff --git a/.github/workflows/pr-tests.yml b/.github/workflows/pr-tests.yml
index c057de664..fa8041488 100644
--- a/.github/workflows/pr-tests.yml
+++ b/.github/workflows/pr-tests.yml
@@ -1,4 +1,6 @@
 name: PR Tests
+permissions:
+  contents: read
 
 on:
   pull_request:
@@ -8,6 +10,8 @@ on:
 
 jobs:
   pr-tests:
-    uses: CitrineInformatics/common-gh-actions/.github/workflows/run-tests.yml@v1
+    uses: CitrineInformatics/common-gh-actions/.github/workflows/run-tests.yml@v1.1
     with:
       src: src/citrine
+      include_313: true
+      skip_38: false
diff --git a/.gitignore b/.gitignore
index 555271b2a..f4ec3857e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,6 +24,7 @@ wheels/
 .installed.cfg
 *.egg
 MANIFEST
+out/
 
 # PyInstaller
 #  Usually these files are written by a python script from a template
@@ -46,6 +47,7 @@ coverage.xml
 *.cover
 .hypothesis/
 .pytest_cache/
+prof/
 
 # Translations
 *.mo
diff --git a/setup.py b/setup.py
index 848e1f4e0..d5f029112 100644
--- a/setup.py
+++ b/setup.py
@@ -46,5 +46,7 @@
           'Programming Language :: Python :: 3.9',
           'Programming Language :: Python :: 3.10',
           'Programming Language :: Python :: 3.11',
+          'Programming Language :: Python :: 3.12',
+          'Programming Language :: Python :: 3.13',
       ],
       )
diff --git a/src/citrine/__version__.py b/src/citrine/__version__.py
index dbea1a391..ce13706c4 100644
--- a/src/citrine/__version__.py
+++ b/src/citrine/__version__.py
@@ -1 +1 @@
-__version__ = "3.23.0"
+__version__ = "3.23.1"
diff --git a/src/citrine/resources/file_link.py b/src/citrine/resources/file_link.py
index 824369449..e4e558d99 100644
--- a/src/citrine/resources/file_link.py
+++ b/src/citrine/resources/file_link.py
@@ -518,8 +518,7 @@ def _search_by_dataset_file_id(self,
 
     @staticmethod
     def _mime_type(file_path: Path):
-        # This string coercion is for supporting pathlib.Path objects in python < 3.8
-        mime_type = mimetypes.guess_type(str(file_path))[0]
+        mime_type, _ = mimetypes.guess_type(file_path)
         if mime_type is None:
             mime_type = "application/octet-stream"
         return mime_type
diff --git a/tests/resources/test_file_link.py b/tests/resources/test_file_link.py
index 0a768a1cc..338559e97 100644
--- a/tests/resources/test_file_link.py
+++ b/tests/resources/test_file_link.py
@@ -1,4 +1,5 @@
 from pathlib import Path
+import platform
 from typing import Collection
 from uuid import uuid4, UUID
 
@@ -39,19 +40,27 @@ def valid_data() -> dict:
     return FileLinkDataFactory(url='www.citrine.io', filename='materials.txt')
 
 
-def test_mime_types(collection: FileCollection):
-    expected_xlsx = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
-    expected_xls = "application/vnd.ms-excel"
-    expected_txt = "text/plain"
-    expected_unk = "application/octet-stream"
-    expected_csv = "text/csv"
-
-    assert collection._mime_type(Path("asdf.xlsx")) == expected_xlsx
-    assert collection._mime_type(Path("asdf.XLSX")) == expected_xlsx
-    assert collection._mime_type(Path("asdf.xls")) == expected_xls
-    assert collection._mime_type(Path("asdf.TXT")) == expected_txt
-    assert collection._mime_type(Path("asdf.csv")) == expected_csv
-    assert collection._mime_type(Path("asdf.FAKE")) == expected_unk
+@pytest.mark.parametrize(
+    ("filename", "mimetype"),
+    [
+        pytest.param(
+            "asdf.xlsx", 
+            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", 
+            marks=pytest.mark.xfail(
+                platform.system() == "Windows", 
+                reason="windows-latest test servers omit xlsx from their registry", 
+                strict=True
+            )
+        ),
+        ("asdf.xls", "application/vnd.ms-excel"),
+        ("asdf.XLS", "application/vnd.ms-excel"),
+        ("asdf.TXT", "text/plain"),
+        ("asdf.csv", "text/csv"),
+        ("asdf.FAKE", "application/octet-stream"),
+    ],
+)
+def test_mime_types(collection: FileCollection, filename, mimetype):
+    assert collection._mime_type(Path(filename)) == mimetype
 
 
 def test_build_equivalence(collection, valid_data):
@@ -77,9 +86,9 @@ def test_string_representation(valid_data):
 
 def test_from_path():
     """Test the string representation."""
-    path = '/some/path/with/file.txt'
+    path = Path.cwd() / 'some' / 'path' / 'with' / 'file.txt'
     assert FileLink.from_path(path).filename == 'file.txt'
-    assert FileLink.from_path(Path(path)).url == Path(path).as_uri()
+    assert FileLink.from_path(str(path)).url == path.as_uri()
     assert FileCollection._is_local_url(FileLink.from_path(path).url)