diff --git a/src/doc_builder/mock_deps/openenv.txt b/src/doc_builder/mock_deps/openenv.txt
index fe2422f4..d780cd8b 100644
--- a/src/doc_builder/mock_deps/openenv.txt
+++ b/src/doc_builder/mock_deps/openenv.txt
@@ -11,3 +11,4 @@ real:requests
 real:pydantic
 real:aiohttp
 real:typer
+real:tomli  # py<3.11 fallback for tomllib in openenv.cli.importers