diff --git a/.github/workflows/release-script.yml b/.github/workflows/release-script.yml
index cd79c9b68..09c80778b 100644
--- a/.github/workflows/release-script.yml
+++ b/.github/workflows/release-script.yml
@@ -17,4 +17,7 @@ jobs:
       with:
         commit_message: "Update installer script"
         commit_user_name: "GitHub Actions"
-        branch: prerelease
\ No newline at end of file
+        branch: prerelease
+        # assemble_installer.py already does a fetch and checkout
+        skip_fetch: true
+        skip_checkout: true
diff --git a/assemble_installer.py b/assemble_installer.py
index ff9d40b9d..5b2608f5b 100644
--- a/assemble_installer.py
+++ b/assemble_installer.py
@@ -24,5 +24,8 @@
     else:
         sys.exit(0)
 
+subprocess.run("git fetch origin prerelease", check=True)
+subprocess.run("git checkout -b prerelease origin/prerelease", check=True)
+
 for installer_url, system in installers:
     shutil.copy(f"{installer_url}/bin/nix-installer", f"nix-installer-{system}")