diff --git a/.python-version b/.python-version
index 6324d40..fb59d01 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.14
+3.14+freethreaded
diff --git a/pyproject.toml b/pyproject.toml
index 09f8168..85ae645 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,7 @@ classifiers = [
     "Operating System :: POSIX :: Linux",
     "Programming Language :: Python :: 3 :: Only",
     "Programming Language :: Python :: 3.14",
+    "Programming Language :: Python :: Free Threading :: 1 - Unstable",
     "Programming Language :: Python :: Implementation :: CPython",
     "Topic :: System :: Archiving :: Mirroring",
     "Typing :: Typed",
@@ -33,10 +34,11 @@ dependencies = [
     "distributed >=2026.1.1",
     "filelock >=3.24.0",
     "hishel[fastapi,httpx,requests] >=1.2.0",
-    "httptools >=0.7.1",
+    "httptools >=0.8.0",
     "httpx-aiohttp >=0.1.9",
     "jinja2 >=3.1.5",
     "kiss-headers >=2.4.0",
+    "msgpack >=1.2.0",
     "packaging >=26.0.0",
     "pooch >=1.9.0",
     "pydantic >=2.12.1",