diff --git a/nvchecker/__init__.py b/nvchecker/__init__.py
index 4791cd2..bd3c7c2 100644
--- a/nvchecker/__init__.py
+++ b/nvchecker/__init__.py
@@ -1,4 +1,4 @@
 # MIT licensed
 # Copyright (c) 2013-2024 lilydjwg <lilydjwg@gmail.com>, et al.
 
-__version__ = '2.16dev'
+__version__ = '2.16'
diff --git a/nvchecker/httpclient/httpx_httpclient.py b/nvchecker/httpclient/httpx_httpclient.py
index 6604727..412eccb 100644
--- a/nvchecker/httpclient/httpx_httpclient.py
+++ b/nvchecker/httpclient/httpx_httpclient.py
@@ -49,7 +49,8 @@ class HttpxSession(BaseSession):
         method, url, json = json, content = body,
         headers = headers,
         follow_redirects = follow_redirects,
-        params = params,
+        # httpx checks for None but not ()
+        params = params or None,
       )
       err_cls: Optional[type] = None
       if r.status_code >= 500:
diff --git a/setup.cfg b/setup.cfg
index b395bd5..efa5296 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,6 +29,7 @@ classifiers =
   Programming Language :: Python :: 3.10
   Programming Language :: Python :: 3.11
   Programming Language :: Python :: 3.12
+  Programming Language :: Python :: 3.13
   Topic :: Internet
   Topic :: Internet :: WWW/HTTP
   Topic :: Software Development
diff --git a/tests/test_android_sdk.py b/tests/test_android_sdk.py
index 28f9530..758e889 100644
--- a/tests/test_android_sdk.py
+++ b/tests/test_android_sdk.py
@@ -18,7 +18,7 @@ async def test_android_package(get_version):
         "android_sdk": "cmake;",
         "repo": "package",
     })
-    assert version.startswith("3.30.")
+    assert version.startswith("3.")
 
 
 async def test_android_package_channel(get_version):