diff --git a/skills/acp-upgrade/SKILL.md b/skills/acp-upgrade/SKILL.md
index 928d32b..b746b1b 100644
--- a/skills/acp-upgrade/SKILL.md
+++ b/skills/acp-upgrade/SKILL.md
@@ -23,7 +23,7 @@ already fixed upstream.
 1. Run the canonical installer, exactly:
 
    ```bash
-   curl -fsSL https://agenticcontrolplane.com/install.sh | sh
+   curl -sf https://agenticcontrolplane.com/install.sh | bash
    ```
 
    Expect an approval requirement: refreshing the governance hook is