diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 42fd733c..6fd850f3 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -33,7 +33,7 @@ jobs:
       - name: Install Linux dependencies
         run: |
           sudo apt update
-          sudo apt install flatpak xsltproc docbook-xsl
+          sudo apt install flatpak flatpak-builder xsltproc docbook-xsl
       - name: Make Flatpak file
         run: |
           make dist/trelby.flatpak