diff --git a/.ci/AppImageBuilder.yml b/.ci/AppImageBuilder.yml
index 60b491bd1..6085c5605 100644
--- a/.ci/AppImageBuilder.yml
+++ b/.ci/AppImageBuilder.yml
@@ -33,8 +33,6 @@ AppDir:
       key_url: 'https://ftp-master.debian.org/keys/archive-key-11.asc'
     - sourceline: 'deb http://deb.debian.org/debian bullseye-updates main'
       key_url: 'https://ftp-master.debian.org/keys/archive-key-11-security.asc'
-    - sourceline: 'deb http://deb.debian.org/debian stretch main'
-      key_url: 'https://ftp-master.debian.org/keys/archive-key-9.asc'
     include:
     - libdrm2
     - libevdev2
@@ -46,8 +44,6 @@ AppDir:
     - libglvnd0
     - libglx0
     - libgs9
-    - libopenal-data=1:1.17*
-    - libopenal1=1:1.17*
     - libpng16-16
     - libqt5core5a
     - libqt5gui5
@@ -69,6 +65,9 @@ AppDir:
     - lib/udev
     - opt/libc/usr/share
     - usr/bin
+    - usr/include
+    - usr/lib/cmake
+    - usr/lib/pkgconfig
     - usr/sbin
     - usr/share/alsa
     - usr/share/apport
diff --git a/.ci/build.sh b/.ci/build.sh
index 91ce79ca3..a9777e014 100644
--- a/.ci/build.sh
+++ b/.ci/build.sh
@@ -227,7 +227,7 @@ else
 	esac
 
 	# Establish general dependencies.
-	pkgs="cmake pkg-config git imagemagick wget p7zip-full wayland-protocols"
+	pkgs="cmake pkg-config git imagemagick wget p7zip-full wayland-protocols tar gzip"
 	if [ "$(dpkg --print-architecture)" = "$arch_deb" ]
 	then
 		pkgs="$pkgs build-essential"
@@ -427,6 +427,20 @@ then
 	# TBD
 	:
 else
+	# Build openal-soft 1.21.1 manually to fix audio issues. This is a temporary
+	# workaround until a newer version of openal-soft trickles down to Debian repos.
+	if [ -d "openal-soft-1.21.1" ]
+	then
+		rm -rf openal-soft-1.21.1/build/*
+	else
+		wget -qO - https://github.com/kcat/openal-soft/archive/refs/tags/1.21.1.tar.gz | tar zxf -
+	fi
+	cwd_root=$(pwd)
+	cd openal-soft-1.21.1/build
+	cmake -G "Unix Makefiles" -D "CMAKE_TOOLCHAIN_FILE=$cwd_root/toolchain.cmake" -D "CMAKE_INSTALL_PREFIX=$cwd_root/archive_tmp/usr" ..
+	make -j$(nproc) install
+	cd ../..
+
 	# Archive Discord Game SDK library.
 	7z e -y -o"archive_tmp/usr/lib/$libdir" discord_game_sdk.zip "lib/$arch_discord/discord_game_sdk.so"
 	[ ! -e "archive_tmp/usr/lib/$libdir/discord_game_sdk.so" ] && echo [!] No Discord Game SDK for architecture [$arch_discord]