diff --git a/action.yml b/action.yml
index 53a6d00..be135c4 100644
--- a/action.yml
+++ b/action.yml
@@ -13,7 +13,7 @@ runs:
         && echo "deb [arch=all,$(dpkg --print-architecture) signed-by=/usr/share/keyrings/prebuilt-mpr-archive-keyring.gpg] \
         https://proget.makedeb.org prebuilt-mpr $(lsb_release -cs)" \
         | sudo tee /etc/apt/sources.list.d/prebuilt-mpr.list \
-        && sudo apt update
+        && sudo apt update --allow-insecure-repositories
     - name: Setup just.
       shell: bash
       run: sudo apt install -y just