diff --git a/doc/installation.md b/doc/installation.md
index bc58172..51b7bfc 100644
--- a/doc/installation.md
+++ b/doc/installation.md
@@ -26,7 +26,7 @@ If you're working on the source, you might want an editable installation with so
 ```bash
 git clone https://github.com/fischermoseley/manta.git
 cd manta
-uv sync
+uv sync --locked
 source .venv/bin/activate
 pre-commit install
 ```