diff --git a/build-pkg/Dockerfile b/build-pkg/Dockerfile
index 742a97c..be57e7a 100644
--- a/build-pkg/Dockerfile
+++ b/build-pkg/Dockerfile
@@ -6,13 +6,17 @@ FROM archlinux:base-devel
 
 # 0. DisableDownloadTimeout
 # 1. Add de-p1st mirror
-# 2. Enable parallel downloads
+# 2. Add home_ungoogled_chromium_Arch (ungoogled-chromium) mirror
+# 3. Add signing key of home_ungoogled_chromium_Arch mirror
+# 4. Enable parallel downloads
 #    TODO: Wait until next baseimage update
 #        && sed --in-place 's|^#ParallelDownloads\s*=.*$|ParallelDownloads = 4|' /etc/pacman.conf \
-# 3. Update mirrors + packages
-# 4. Install svn for makepkg to handle svn sources
+# 5. Update mirrors + packages
+# 6. Install svn for makepkg to handle svn sources
 RUN printf '\n[options]\nDisableDownloadTimeout\n' >> /etc/pacman.conf && \
     printf '\n[de-p1st]\nSigLevel = Optional TrustAll\nServer = https://arch.p1st.de\n' >> /etc/pacman.conf && \
+    printf '\n[home_ungoogled_chromium_Arch]\nSigLevel = Required TrustAll\nServer = https://download.opensuse.org/repositories/home:/ungoogled_chromium/Arch/$arch\n' >> /etc/pacman.conf && \
+    curl -s 'https://download.opensuse.org/repositories/home:/ungoogled_chromium/Arch/x86_64/home_ungoogled_chromium_Arch.key' | pacman-key --add - && \
     pacman -Syu --noconfirm && \
     pacman -S --needed --noconfirm svn