diff --git a/lefthook.yml b/lefthook.yml
index 9b4be96056f..e66d56f6562 100644
--- a/lefthook.yml
+++ b/lefthook.yml
@@ -18,4 +18,13 @@ pre-commit:
 post-merge:
   commands:
     update-submodules:
-      run: pnpm update-submodules
\ No newline at end of file
+      run: pnpm update-submodules
+    update-packages:
+      run: pnpm i
+
+post-checkout:
+  commands:
+    update-packages:
+      # cf https://git-scm.com/docs/githooks#_post_checkout:
+      # The 3rd argument is 1 for branch checkouts and 0 for file checkouts.
+      run: if test {3} -eq "1"; then pnpm i; fi