diff --git a/CHANGELOG.md b/CHANGELOG.md
index 557f070d..0f1c2b98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,14 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 <!-- insertion marker -->
+## [0.16.2](https://github.com/mkdocstrings/mkdocstrings/releases/tag/0.16.2) - 2021-10-04
+
+<small>[Compare with 0.16.1](https://github.com/mkdocstrings/mkdocstrings/compare/0.16.1...0.16.2)</small>
+
+### Dependencies
+- Support `pymdown-extensions` v9.x ([0831343](https://github.com/mkdocstrings/mkdocstrings/commit/0831343aa8726ed785b17bba1c8d4adf49b46748) by Ofek Lev and [38b22ec](https://github.com/mkdocstrings/mkdocstrings/commit/38b22ec11cded4689115dafc43e16a1e8e40feda) by Timothée Mazzucotelli).
+
+
 ## [0.16.1](https://github.com/mkdocstrings/mkdocstrings/releases/tag/0.16.1) - 2021-09-23
 
 <small>[Compare with 0.16.0](https://github.com/mkdocstrings/mkdocstrings/compare/0.16.0...0.16.1)</small>
diff --git a/docs/theming.md b/docs/theming.md
index 8a1d969c..994d9ba6 100644
--- a/docs/theming.md
+++ b/docs/theming.md
@@ -1,7 +1,7 @@
 # Themes
 
 *mkdocstrings* can support multiple MkDocs themes.
-It currently supports supports the
+It currently supports the
 *[Material for MkDocs](https://squidfunk.github.io/mkdocs-material/)*
 theme and, partially, the built-in ReadTheDocs theme.
 
diff --git a/pyproject.toml b/pyproject.toml
index 4f806842..5e3fa81c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,7 +23,7 @@ dependencies = [
     "MarkupSafe>=1.1,<3.0",
     "mkdocs~=1.2",
     "mkdocs-autorefs>=0.1,<0.4",
-    "pymdown-extensions>=6.3,<9.0",
+    "pymdown-extensions>=6.3,<10.0",
     "pytkdocs>=0.2.0,<0.13.0",
 ]
 
diff --git a/src/mkdocstrings/handlers/rendering.py b/src/mkdocstrings/handlers/rendering.py
index e8383cf2..e7ff9802 100644
--- a/src/mkdocstrings/handlers/rendering.py
+++ b/src/mkdocstrings/handlers/rendering.py
@@ -33,8 +33,27 @@ class Highlighter(Highlight):
     The underlying implementation is `pymdownx.highlight` regardless.
     """
 
+    # https://raw.githubusercontent.com/facelessuser/pymdown-extensions/main/docs/src/markdown/extensions/highlight.md
     _highlight_config_keys = frozenset(
-        "use_pygments guess_lang css_class pygments_style noclasses linenums language_prefix".split(),
+        (
+            "css_class",
+            "guess_lang",
+            "pygments_style",
+            "noclasses",
+            "use_pygments",
+            "linenums",
+            "linenums_special",
+            "linenums_style",
+            "linenums_class",
+            "extend_pygments_lang",
+            "language_prefix",
+            "code_attr_on_pre",
+            "auto_title",
+            "auto_title_map",
+            "line_spans",
+            "anchor_linenums",
+            "line_anchors",
+        )
     )
 
     def __init__(self, md: Markdown):
diff --git a/tests/test_themes.py b/tests/test_themes.py
index c3396ad9..3d6066d1 100644
--- a/tests/test_themes.py
+++ b/tests/test_themes.py
@@ -14,10 +14,9 @@
     ],
     indirect=["plugin"],
 )
-@pytest.mark.skipif(sys.version_info < (3, 7), reason="material is not installed on Python 3.6")
-def test_render_themes_templates_python(plugin):
-    """Test rendering of a given theme's templates."""
-    modules = {
+@pytest.mark.parametrize(
+    "module",
+    [
         "mkdocstrings.extension",
         "mkdocstrings.inventory",
         "mkdocstrings.loggers",
@@ -25,9 +24,12 @@ def test_render_themes_templates_python(plugin):
         "mkdocstrings.handlers.base",
         "mkdocstrings.handlers.python",
         "mkdocstrings.handlers.rendering",
-    }
+    ],
+)
+@pytest.mark.skipif(sys.version_info < (3, 7), reason="material is not installed on Python 3.6")
+def test_render_themes_templates_python(module, plugin):
+    """Test rendering of a given theme's templates."""
     handler = plugin.handlers.get_handler("python")
     handler.renderer._update_env(plugin.md, plugin.handlers._config)  # noqa: WPS437
-    for identifier in modules:
-        data = handler.collector.collect(identifier, {})
-        handler.renderer.render(data, {})
+    data = handler.collector.collect(module, {})
+    handler.renderer.render(data, {})