diff --git a/pyproject.toml b/pyproject.toml
index fc8adcef..47ac5aaf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -67,6 +67,7 @@ dev-dependencies = [
     "pytest-responses>=0.5.1",
     "more-itertools>=10.6.0",
     "deepdiff>=8.5.0",
+    "lxml<=5.3.2",
 ]
 
 [tool.hatch.metadata]
diff --git a/uv.lock b/uv.lock
index 3bf52202..a8a02634 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1917,6 +1917,7 @@ dev = [
     { name = "freezegun" },
     { name = "gitpython" },
     { name = "ipdb" },
+    { name = "lxml" },
     { name = "more-itertools" },
     { name = "mypy" },
     { name = "mypy-extensions" },
@@ -1975,6 +1976,7 @@ dev = [
     { name = "freezegun", specifier = ">=1.5.1" },
     { name = "gitpython" },
     { name = "ipdb" },
+    { name = "lxml", specifier = "<=5.3.2" },
     { name = "more-itertools", specifier = ">=10.6.0" },
     { name = "mypy" },
     { name = "mypy-extensions" },