diff --git a/crates/zensical/src/config/project.rs b/crates/zensical/src/config/project.rs
index 2577b7d..5aaa322 100644
--- a/crates/zensical/src/config/project.rs
+++ b/crates/zensical/src/config/project.rs
@@ -82,6 +82,8 @@ pub struct Project {
     pub extra_templates: Vec<String>,
     /// Markdown extension configuration.
     pub mdx_configs: MdxConfigs,
+    /// Markdown extension configuration hash.
+    pub mdx_configs_hash: u64,
     /// Plugins.
     pub plugins: Plugins,
     /// Navigation structure.
diff --git a/crates/zensical/src/workflow.rs b/crates/zensical/src/workflow.rs
index 4a96125..227300d 100644
--- a/crates/zensical/src/workflow.rs
+++ b/crates/zensical/src/workflow.rs
@@ -137,8 +137,10 @@ pub fn process_markdown(
         .map_concurrency(
             with_id(move |id: &Id, path: String| {
                 let data = fs::read_to_string(path)?;
-                cached(&config, id, data, |data| Markdown::new(id, data))
-                    .into_report()
+                cached(&config, id, (config.hash, data), |(_, data)| {
+                    Markdown::new(id, data)
+                })
+                .into_report()
             }),
             1,
         )
diff --git a/python/zensical/config.py b/python/zensical/config.py
index d08e2bc..97fde26 100644
--- a/python/zensical/config.py
+++ b/python/zensical/config.py
@@ -23,8 +23,10 @@
 
 from __future__ import annotations
 
+import hashlib
 import importlib
 import os
+import pickle
 import yaml
 
 try:
@@ -34,7 +36,6 @@ except ModuleNotFoundError:
 
 from click import ClickException
 from deepmerge import always_merger
-from functools import partial
 from typing import Any, IO
 from yaml import BaseLoader, Loader, YAMLError
 from yaml.constructor import ConstructorError
@@ -113,6 +114,13 @@ def parse_mkdocs_config(path: str) -> dict:
     return _CONFIG
 
 
+def get_config():
+    """
+    Return configuration.
+    """
+    return _CONFIG
+
+
 def get_theme_dir() -> str:
     """
     Return the theme directory.
@@ -444,6 +452,7 @@ def _apply_defaults(config: dict, path: str) -> dict:
     # Ensure the table of contents title is initialized, as it's used inside
     # the template, and the table of contents extension is always defined
     config["mdx_configs"]["toc"].setdefault("title", None)
+    config["mdx_configs_hash"] = _hash(mdx_configs)
 
     # Convert plugins configuration
     config["plugins"] = _convert_plugins(config.get("plugins", []), config)
@@ -473,6 +482,14 @@ def set_default(
     return entry[key]
 
 
+def _hash(data: any) -> int:
+    """
+    Compute a hash for the given data.
+    """
+    hash = hashlib.sha1(pickle.dumps(data))
+    return int(hash.hexdigest(), 16) % (2**64)
+
+
 def _convert_extra(data: dict | list) -> dict | list:
     """
     Recursively convert all None values in a dictionary or list to empty strings.
diff --git a/python/zensical/markdown.py b/python/zensical/markdown.py
index 11811aa..c5be44d 100644
--- a/python/zensical/markdown.py
+++ b/python/zensical/markdown.py
@@ -30,7 +30,7 @@ from datetime import date, datetime
 from markdown import Markdown
 from yaml import SafeLoader
 
-from .config import _CONFIG
+from .config import get_config
 from .extensions.links import LinksExtension
 from .extensions.search import SearchExtension
 
@@ -61,7 +61,7 @@ def render(content: str, path: str) -> dict:
     in order to support the specific syntax of Python Markdown. We're working
     on moving the entire rendering chain to Rust.
     """
-    config = _CONFIG
+    config = get_config()
 
     # Initialize Markdown parser
     md = Markdown(