diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 7ef5ea6..eb84eab 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -17,8 +17,9 @@ jobs:
           - { python: "3.11", os: "ubuntu-latest" }
           - { python: "3.12", os: "ubuntu-latest" }
           - { python: "3.13", os: "ubuntu-latest" }
-          - { python: "3.13", os: "windows-latest" }
-          - { python: "3.13", os: "macos-latest" }
+          - { python: "3.14", os: "ubuntu-latest" }
+          - { python: "3.14", os: "windows-latest" }
+          - { python: "3.14", os: "macos-latest" }
     steps:
       - name: Check out the repository
         uses: actions/checkout@v6
diff --git a/tests/test_main.py b/tests/test_main.py
index 0b0b1bc..d10f675 100644
--- a/tests/test_main.py
+++ b/tests/test_main.py
@@ -3,6 +3,7 @@
 import unittest.mock
 
 import pytest
+import sys
 from click.testing import CliRunner
 
 from stac_api_validator import __main__
@@ -29,7 +30,9 @@ def test_retrieve_called_with_auth_headers(
 
     expected_headers = {
         "User-Agent": f"python-requests/{requests_version}",
-        "Accept-Encoding": "gzip, deflate",
+        "Accept-Encoding": "gzip, deflate, zstd"
+        if sys.version_info >= (3, 14)
+        else "gzip, deflate",
         "Accept": "*/*",
         "Connection": "keep-alive",
         "Authorization": "api-key fake-api-key-value",
diff --git a/tests/test_validations.py b/tests/test_validations.py
index 96846a4..c620108 100644
--- a/tests/test_validations.py
+++ b/tests/test_validations.py
@@ -13,6 +13,7 @@
 import pystac
 import pytest
 import requests
+import sys
 
 from stac_api_validator import validations
 
@@ -55,7 +56,9 @@ def stac_check_config() -> Generator[str, None, None]:
 def expected_headers(requests_version: str) -> Generator[Dict[str, str], None, None]:
     yield {
         "User-Agent": f"python-requests/{requests_version}",
-        "Accept-Encoding": "gzip, deflate",
+        "Accept-Encoding": "gzip, deflate, zstd"
+        if sys.version_info >= (3, 14)
+        else "gzip, deflate",
         "Accept": "*/*",
         "Connection": "keep-alive",
         "Authorization": "api-key fake-api-key-value",