diff --git a/pyproject.toml b/pyproject.toml
index 265b7e73..44855d2e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -43,6 +43,7 @@ dependencies = [
     "impit>=0.8.0",
     "lazy-object-proxy>=1.11.0",
     "more_itertools>=10.2.0",
+    "pydantic>=2.11.0",
     "typing-extensions>=4.1.0",
     "websockets>=14.0",
     "yarl>=1.18.0",
diff --git a/uv.lock b/uv.lock
index 49aa39c5..c9cde3d5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -38,6 +38,7 @@ dependencies = [
     { name = "impit" },
     { name = "lazy-object-proxy" },
     { name = "more-itertools" },
+    { name = "pydantic" },
     { name = "typing-extensions" },
     { name = "websockets" },
     { name = "yarl" },
@@ -80,6 +81,7 @@ requires-dist = [
     { name = "impit", specifier = ">=0.8.0" },
     { name = "lazy-object-proxy", specifier = ">=1.11.0" },
     { name = "more-itertools", specifier = ">=10.2.0" },
+    { name = "pydantic", specifier = ">=2.11.0" },
     { name = "scrapy", marker = "extra == 'scrapy'", specifier = ">=2.11.0" },
     { name = "typing-extensions", specifier = ">=4.1.0" },
     { name = "websockets", specifier = ">=14.0" },