diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8c8d05598b..eb21f39f69 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -143,10 +143,6 @@ stages:
 
 # Debian
 
-.debian-bullseye-amd64: &debian_bullseye_amd64_image
-  image: "$CI_REGISTRY_IMAGE:debian-bullseye-amd64"
-  <<: *linux_amd64
-
 .debian-bookworm-amd64: &debian_bookworm_amd64_image
   image: "$CI_REGISTRY_IMAGE:debian-bookworm-amd64"
   <<: *linux_amd64
@@ -1259,58 +1255,6 @@ unit:clang:tsan:
     - job: clang:tsan
       artifacts: true
 
-# Jobs for Debian 11 "bullseye" (amd64)
-
-clang:bullseye:amd64:
-  variables:
-    CC: ${CLANG}
-    CFLAGS: "${CFLAGS_COMMON} -Wenum-conversion"
-  <<: *debian_bullseye_amd64_image
-  <<: *build_job
-
-system:clang:bullseye:amd64:
-  <<: *debian_bullseye_amd64_image
-  <<: *system_test_job
-  needs:
-    - job: clang:bullseye:amd64
-      artifacts: true
-
-unit:clang:bullseye:amd64:
-  <<: *debian_bullseye_amd64_image
-  <<: *unit_test_job
-  needs:
-    - job: clang:bullseye:amd64
-      artifacts: true
-
-gcc:bullseye:amd64:
-  variables:
-    CC: gcc
-    CFLAGS: "${CFLAGS_COMMON}"
-    # See https://gitlab.isc.org/isc-projects/bind9/-/issues/3444
-    EXTRA_CONFIGURE: "--with-libidn2 --without-jemalloc"
-  <<: *debian_bullseye_amd64_image
-  <<: *build_job
-
-system:gcc:bullseye:amd64:
-  # Set up environment variables that allow the "keyfromlabel" system test to be run
-  variables:
-    DEFAULT_OPENSSL_CONF: "/etc/ssl/openssl.cnf"
-    OPENSSL_CONF: "/var/tmp/etc/openssl.cnf"
-    SOFTHSM2_CONF: "/var/tmp/softhsm2/softhsm2.conf"
-    SOFTHSM2_MODULE: "/usr/lib/softhsm/libsofthsm2.so"
-  <<: *debian_bullseye_amd64_image
-  <<: *system_test_job
-  needs:
-    - job: gcc:bullseye:amd64
-      artifacts: true
-
-unit:gcc:bullseye:amd64:
-  <<: *debian_bullseye_amd64_image
-  <<: *unit_test_job
-  needs:
-    - job: gcc:bullseye:amd64
-      artifacts: true
-
 # Jobs for Clang builds on Debian 12 "bookworm" (amd64)
 
 clang:bookworm:amd64: