diff --git a/pyproject.toml b/pyproject.toml
index 5771f7b972..3dcda98980 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -52,6 +52,10 @@ docs = [
     'pydata-sphinx-theme',
     'numpydoc',
     'numcodecs[msgpack]',
+    "msgpack",
+    "lmdb",
+    "zstandard",
+    "crc32c",
 ]
 extra = [
     'attrs',