diff --git a/sphinx_js/typedoc.py b/sphinx_js/typedoc.py
index ed173c7c..6810e882 100644
--- a/sphinx_js/typedoc.py
+++ b/sphinx_js/typedoc.py
@@ -67,7 +67,7 @@ def typedoc_output(
     env = os.environ.copy()
     env["TYPEDOC_NODE_MODULES"] = str(Path(typedoc).parents[3].resolve())
     command = Command("npx")
-    command.add("tsx")
+    command.add("tsx@4.15.8")
     dir = Path(__file__).parent.resolve() / "js"
     command.add("--tsconfig", str(dir / "tsconfig.json"))
     command.add("--import", str(dir / "registerImportHook.mjs"))
diff --git a/tests/test_paths.py b/tests/test_paths.py
index 86b5f719..268a2f2b 100644
--- a/tests/test_paths.py
+++ b/tests/test_paths.py
@@ -94,7 +94,7 @@ def test_global_install(tmp_path_factory, monkeypatch):
     tmpdir2 = tmp_path_factory.mktemp("blah")
     monkeypatch.setenv("npm_config_prefix", str(tmpdir))
     monkeypatch.setenv("PATH", str(tmpdir / "bin"), prepend=":")
-    subprocess.run(["npm", "i", "-g", "typedoc", "typescript"])
+    subprocess.run(["npm", "i", "-g", "typedoc@0.25", "typescript", "tsx@4.15.8"])
     typedoc = search_node_modules("typedoc", "typedoc/bin/typedoc", str(tmpdir2))
     monkeypatch.setenv("TYPEDOC_NODE_MODULES", str(Path(typedoc).parents[3]))
     dir = Path(__file__).parents[1].resolve() / "sphinx_js/js"
@@ -102,7 +102,7 @@ def test_global_install(tmp_path_factory, monkeypatch):
     res = subprocess.run(
         [
             "npx",
-            "tsx",
+            "tsx@4.15.8",
             "--import",
             dir / "registerImportHook.mjs",
             dir / "call_typedoc.ts",