diff --git a/docs/hooks/.gitignore b/docs/hooks/.gitignore
new file mode 100644
index 00000000..eeb8a6ec
--- /dev/null
+++ b/docs/hooks/.gitignore
@@ -0,0 +1 @@
+**/__pycache__
diff --git a/docs/hooks/macros.py b/docs/hooks/macros.py
new file mode 100644
index 00000000..5fc4fe3c
--- /dev/null
+++ b/docs/hooks/macros.py
@@ -0,0 +1,11 @@
+import importlib.metadata
+
+
+def define_env(env):
+    @env.macro
+    def requirements():
+        packages = dict()
+        for package in sorted(set(importlib.metadata.packages_distributions().keys())):
+            if package.startswith("numcodecs-wasm") or package.startswith("numcodecs_wasm"):
+                packages[package] = importlib.metadata.version(package)
+        return packages
diff --git a/docs/requirements.txt b/docs/requirements.txt
index ec951cb6..a440873c 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -28,10 +28,11 @@ properdocs
 properdocs-theme-readthedocs
 
 mkdocstrings[python]
+mkdocs-exclude
 mkdocs-include-markdown-plugin
 mkdocs-gen-files
 mkdocs-literate-nav
-mkdocs-exclude
+mkdocs-macros-plugin
 
 Pygments
 
diff --git a/docs/try-repl.md b/docs/try-repl.md
index 981e26d7..fbf9e56d 100644
--- a/docs/try-repl.md
+++ b/docs/try-repl.md
@@ -1,3 +1,7 @@
+---
+render_macros: true
+---
+
 # Try the `numcodecs-wasm-*` codecs using JupyterLite
 
 /// details | **Warning:** JupyterLite may not work in every web browser
@@ -34,6 +38,18 @@ plt.show()\
     // example package lazy dependencies
     "crc32c",
     "msgpack",
-]}));
+]})) + "&pyodideKernelEnv=" + encodeURIComponent(JSON.stringify({"$override": {
+  "CLIMET_LAB_BOOTSTRAP_CODE": `\
+def preinstall_packages(lines):
+    return """
+import micropip
+await micropip.install([
+    f"{package}=={version}" for package, version in {{ requirements() }}.items()
+])
+""".splitlines(keepends=True) + lines
+preinstall_packages.has_side_effects = True
+ip.input_transformers_cleanup.append(preinstall_packages)
+`,
+}}));
   });
 </script>
diff --git a/properdocs.yml b/properdocs.yml
index be33a051..dba387fa 100644
--- a/properdocs.yml
+++ b/properdocs.yml
@@ -47,6 +47,11 @@ plugins:
         - requirements.txt
   - search
   - autorefs
+  - macros:
+      module_name: docs/hooks/macros
+      on_error_fail: true
+      on_undefined: strict
+      render_by_default: false
   - mkdocstrings:
       enable_inventory: true
       handlers: