diff --git a/.gitlab-ci/setup-container.sh b/.gitlab-ci/setup-container.sh
index 6c4b439b887b..bb00895c1888 100755
--- a/.gitlab-ci/setup-container.sh
+++ b/.gitlab-ci/setup-container.sh
@@ -67,6 +67,7 @@ PKGS_LIBCAMERA_RUNTIME_MULTIARCH=(
 	libudev-dev
 	libunwind-dev
 	libyaml-dev
+	libyuv-dev
 	lttng-tools
 	nlohmann-json3-dev
 	qt6-base-dev
@@ -109,15 +110,11 @@ declare -A components
 
 # Install additional packages on a per distribution version basis.
 case $FDO_DISTRIBUTION_VERSION in
-'bullseye')
-	# gcc 9 to expand compilation testing coverage.
-	PKGS_LIBCAMERA_RUNTIME+=( g++-9 )
-	;;
 'bookworm')
+	# gcc 11 to expand compilation testing coverage.
+	PKGS_LIBCAMERA_RUNTIME+=( g++-11 )
 	# libclang-rt-dev for the clang ASan runtime.
 	PKGS_LIBCAMERA_RUNTIME_MULTIARCH+=( libclang-rt-dev )
-	# For the Android camera HAL and the virtual pipeline handler.
-	PKGS_LIBCAMERA_RUNTIME_MULTIARCH+=( libyuv-dev )
 	;;
 'trixie')
 	# gcc 13 to expand compilation testing coverage.
@@ -138,8 +135,6 @@ case $FDO_DISTRIBUTION_VERSION in
 	PKGS_LIBCAMERA_RUNTIME+=( clang-format jq python3-autopep8 reuse shellcheck )
 	# libclang-rt-dev for the clang ASan runtime.
 	PKGS_LIBCAMERA_RUNTIME_MULTIARCH+=( libclang-rt-19-dev )
-	# For the Android camera HAL and the virtual pipeline handler.
-	PKGS_LIBCAMERA_RUNTIME_MULTIARCH+=( libyuv-dev )
 	# For lc-compliance in the `test-lc-compliance:virtual` job
 	# libevent-dev cannot be used here, see build-libcamera-common.sh
 	PKGS_LIBCAMERA_RUNTIME_MULTIARCH+=( libevent-2.1-7t64 libevent-pthreads-2.1-7t64 )
@@ -170,14 +165,6 @@ cbuild_install_pkgs() {
 
 	local arch
 
-	# The qt6-tools-dev-tools package is only available for bullseye in the
-	# backports repository. Enable backports only for that version.
-	if [[ $FDO_DISTRIBUTION_VERSION == 'bullseye' ]] ; then
-		echo "deb http://archive.debian.org/debian bullseye-backports main" \
-		       > /etc/apt/sources.list.d/bullseye-backports.list
-		apt update
-	fi
-
 	apt install -y ${pkgs_cbuild[@]}
 	apt-mark auto ${pkgs_cbuild[@]}
 
@@ -220,13 +207,8 @@ dpkg_check_version() {
 cbuild_fixups() {
 	echo "Applying miscellaneous fixups"
 
-	local pip3_options
 	local pkg
 
-	if [[ $FDO_DISTRIBUTION_VERSION != 'bullseye' ]] ; then
-		pip3_options=--break-system-packages
-	fi
-
 	# Install packages from pip to ensure minimum versions.
 	for pkg in "${PKGS_PIP_MIN_VERSIONS[@]}" ; do
 		pkg=($pkg)
@@ -254,27 +236,9 @@ cbuild_fixups() {
 			fi
 
 			apt install -y python3-pip
-			pip3 install ${pip3_options} ${pip_name}==${min_version}
+			pip3 install --break-system-packages ${pip_name}==${min_version}
 		fi
 	done
-
-	# Create pybind11.pc manually if not provided by the distribution
-	# package.
-	if [[ ! -f /usr/share/pkgconfig/pybind11.pc ]] ; then
-		echo "pybind11-dev package not providing pybind11.pc, creating file manually"
-
-		version=$(dpkg_version pybind11-dev)
-
-		cat <<EOF > /usr/share/pkgconfig/pybind11.pc
-prefix=/usr
-includedir=\${prefix}/include
-
-Name: pybind11
-Description: Seamless operability between C++11 and Python
-Version: ${version}
-Cflags: -I\${includedir}
-EOF
-	fi
 }
 
 cbuild_cleanup_pkgs() {
diff --git a/gitlab-ci.yml b/gitlab-ci.yml
index 427f2d2516dc..d01ee87d3325 100644
--- a/gitlab-ci.yml
+++ b/gitlab-ci.yml
@@ -62,11 +62,6 @@ include:
     ref: *templates_sha
     file: '/templates/debian.yml'
 
-.libcamera-ci.debian:11:
-  variables:
-    FDO_DISTRIBUTION_VERSION: 'bullseye'
-    FDO_DISTRIBUTION_TAG: '2026-04-05.0'
-
 .libcamera-ci.debian:12:
   variables:
     FDO_DISTRIBUTION_VERSION: 'bookworm'
@@ -92,11 +87,6 @@ include:
       fi ;
       .gitlab-ci/setup-container.sh
 
-container-debian:11:
-  extends:
-    - .container-debian
-    - .libcamera-ci.debian:11
-
 container-debian:12:
   extends:
     - .container-debian
@@ -152,22 +142,6 @@ container-debian:13:
     BUILD_TYPE: debug
     MESON_OPTIONS: ${MESON_ALL_OPTIONS}
 
-build-full:debian:11:
-  extends:
-    - .libcamera-ci.debian:11
-    - .build-full:debian
-  needs:
-    - job: container-debian:11
-      artifacts: false
-  parallel:
-    matrix:
-      - ARCH: amd64
-        CC: gcc-9
-        CXX: g++-9
-      - ARCH: amd64
-        CC: gcc-10
-        CXX: g++-10
-
 build-full:debian:12:
   extends:
     - .libcamera-ci.debian:12
@@ -180,6 +154,9 @@ build-full:debian:12:
       ${MESON_ALL_OPTIONS}
   parallel:
     matrix:
+      - ARCH: amd64
+        CC: gcc-11
+        CXX: g++-11
       - ARCH: amd64
         CC: gcc-12
         CXX: g++-12