diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 90fd9d57..c238e433 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -43,7 +43,7 @@
 variables:
   FDO_UPSTREAM_REPO: wayland/weston
   FDO_REPO_SUFFIX: "$BUILD_OS/$BUILD_ARCH"
-  FDO_DISTRIBUTION_TAG: '2021-11-24.0-kernel-v5.14'
+  FDO_DISTRIBUTION_TAG: '2021-11-25.2-bullseye-sphinx'
 
 
 include:
@@ -74,7 +74,7 @@ stages:
 .os-debian:
   variables:
     BUILD_OS: debian
-    FDO_DISTRIBUTION_VERSION: buster
+    FDO_DISTRIBUTION_VERSION: bullseye
     FDO_DISTRIBUTION_EXEC: 'env FDO_CI_CONCURRENT=${FDO_CI_CONCURRENT} BUILD_ARCH=${BUILD_ARCH} KERNEL_IMAGE=${KERNEL_IMAGE} KERNEL_DEFCONFIG=${KERNEL_DEFCONFIG} bash .gitlab-ci/debian-install.sh'
 
 .ci-rules:
@@ -170,8 +170,8 @@ aarch64-debian-container_prep:
 
 .build-with-clang:
   variables:
-    CC: clang-8
-    CC_LD: lld-8
+    CC: clang-11
+    CC_LD: lld-11
     MESON_TOOLCHAIN_OPTIONS: "$MESON_OPTIONS -Db_lundef=false" # clang+ASan+undef=boom
 
 # Extends the core build templates to also provide for running our testing. We
diff --git a/.gitlab-ci/build-deps.sh b/.gitlab-ci/build-deps.sh
index 5edaf3c8..816a6585 100755
--- a/.gitlab-ci/build-deps.sh
+++ b/.gitlab-ci/build-deps.sh
@@ -22,9 +22,9 @@ export PATH=$HOME/.local/bin:$PATH
 # generation), Doxygen (parse structures/functions/comments from source code),
 # Breathe (a bridge between Doxygen and Sphinx), and we use the Read the Docs
 # theme for the final presentation.
-pip3 install sphinx==2.1.0 --user
-pip3 install breathe==4.13.0.post0 --user
-pip3 install sphinx_rtd_theme==0.4.3 --user
+pip3 install sphinx==4.2.0 --user
+pip3 install breathe==4.31.0 --user
+pip3 install sphinx_rtd_theme==1.0.0 --user
 
 # Build a Linux kernel for use in testing. We enable the VKMS module so we can
 # predictably test the DRM backend in the absence of real hardware. We lock the
diff --git a/.gitlab-ci/debian-install.sh b/.gitlab-ci/debian-install.sh
index 9bfe6dea..2c243101 100644
--- a/.gitlab-ci/debian-install.sh
+++ b/.gitlab-ci/debian-install.sh
@@ -11,7 +11,6 @@ LINUX_DEV_PKGS="
 	bc
 	bison
 	flex
-	libelf-dev
 "
 
 # These get temporary installed for building Mesa and then force-removed.
@@ -21,25 +20,26 @@ MESA_DEV_PKGS="
 	gettext
 	libwayland-egl-backend-dev
 	libxrandr-dev
-	llvm-8-dev
-	python-mako
+	libxshmfence-dev
+	libxrandr-dev
+	llvm-11-dev
 	python3-mako
 "
 
 # Needed for running the custom-built mesa
 MESA_RUNTIME_PKGS="
-	libllvm8
+	libllvm11
 "
 
-echo 'deb http://deb.debian.org/debian buster-backports main' >> /etc/apt/sources.list
 apt-get update
 apt-get -y --no-install-recommends install \
 	autoconf \
 	automake \
 	build-essential \
-	clang-8 \
+	clang-11 \
 	curl \
 	doxygen \
+	freerdp2-dev \
 	gcovr \
 	git \
 	lcov \
@@ -48,7 +48,9 @@ apt-get -y --no-install-recommends install \
 	libcairo2-dev \
 	libcolord-dev \
 	libdbus-1-dev \
+	libdrm-dev \
 	libegl1-mesa-dev \
+	libelf-dev \
 	libevdev-dev \
 	libexpat1-dev \
 	libffi-dev \
@@ -81,28 +83,39 @@ apt-get -y --no-install-recommends install \
 	libx11-xcb-dev \
 	libxcb1-dev \
 	libxcb-composite0-dev \
+	libxcb-dri2-0-dev \
+	libxcb-dri3-dev \
+	libxcb-glx0-dev \
+	libxcb-present-dev \
+	libxcb-randr0-dev \
+	libxcb-shm0-dev \
+	libxcb-sync-dev \
 	libxcb-xfixes0-dev \
 	libxcb-xkb-dev \
 	libxcursor-dev \
+	libxdamage-dev \
+	libxext-dev \
+	libxfixes-dev \
 	libxkbcommon-dev \
 	libxml2-dev \
-	lld-8 \
-	llvm-8 \
+	libxxf86vm-dev \
+	lld-11 \
+	llvm-11 \
+	llvm-11-dev \
 	mesa-common-dev \
 	ninja-build \
 	pkg-config \
 	python3-pip \
+	python3-pygments \
 	python3-setuptools \
 	qemu-system \
 	sysvinit-core \
+	x11proto-dev \
 	xwayland \
 	$MESA_DEV_PKGS \
 	$MESA_RUNTIME_PKGS \
 	$LINUX_DEV_PKGS \
 
-apt-get -y --no-install-recommends -t buster-backports install \
-	freerdp2-dev
-
 
 # Actually build our dependencies ...
 ./.gitlab-ci/build-deps.sh