diff --git a/.github/actions/setup-build-environment/action.yml b/.github/actions/setup-build-environment/action.yml
index 9aa6230d..04990afa 100644
--- a/.github/actions/setup-build-environment/action.yml
+++ b/.github/actions/setup-build-environment/action.yml
@@ -23,6 +23,7 @@ runs:
       shell: bash
       run: |
         uv sync --locked --no-group docs
+        uv venv --allow-existing --seed
         echo "$GITHUB_WORKSPACE/.venv/bin" >> "$GITHUB_PATH"
 
     # Recommended EastMesh tag format:
diff --git a/build.sh b/build.sh
index 44531637..aa0bcbe1 100755
--- a/build.sh
+++ b/build.sh
@@ -9,6 +9,7 @@ require_uv() {
 
 sync_python_tooling() {
   uv sync --locked --no-group docs >/dev/null
+  uv venv --allow-existing --seed >/dev/null
 }
 
 run_python() {