diff --git a/.github/workflows/linux-nightly.yml b/.github/workflows/linux-nightly.yml
index d9969b5..76a754c 100644
--- a/.github/workflows/linux-nightly.yml
+++ b/.github/workflows/linux-nightly.yml
@@ -33,6 +33,12 @@ jobs:
         if: matrix.target == 'aarch64-unknown-linux-gnu'
         run: |
           sudo dpkg --add-architecture arm64
+          # Add ARM64 repositories
+          sudo tee /etc/apt/sources.list.d/arm64.list << EOF
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy main restricted
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy-updates main restricted
+          deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports jammy-security main restricted
+          EOF
           sudo apt-get update
           sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu
           # Install ARM64 versions of GTK and related dependencies