diff --git a/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/devcontainer.json b/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/devcontainer.json
deleted file mode 100644
index 3bd9b05e616..00000000000
--- a/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/devcontainer.json
+++ /dev/null
@@ -1,25 +0,0 @@
-// The command "tox -e update_docker_platforms"
-//   creates .devcontainer/portability-*-*/devcontainer.json
-//      from .devcontainer/portability-devcontainer.json.in
-// See https://aka.ms/devcontainer.json for format details.
-{
-    "name": "centos-7-devtoolset-gcc_11-minimal (≥ 8-core)",
-    "build": {
-        "dockerfile": "portability-Dockerfile",
-        // See tox.ini for definitions
-        "args": {
-            "SYSTEM_FACTOR": "centos-7-devtoolset-gcc_11",
-            "PACKAGE_FACTOR": "minimal",
-            "DOCKER_TARGET": "with-targets",
-            "DOCKER_TAG": "dev"
-        }
-    },
-    "containerEnv": {
-        "MAKE": "make -j4"
-    },
-    "onCreateCommand": ".devcontainer/onCreate.sh",
-    "updateContentCommand": ".devcontainer/portability-updateContent.sh",
-    "extensions": [
-        "ms-python.python"
-    ]
-}
diff --git a/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/portability-Dockerfile b/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/portability-Dockerfile
deleted file mode 120000
index 692e2a79d64..00000000000
--- a/.devcontainer/portability-centos-7-devtoolset-gcc_11-minimal/portability-Dockerfile
+++ /dev/null
@@ -1 +0,0 @@
-../portability-Dockerfile
\ No newline at end of file
diff --git a/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/devcontainer.json b/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/devcontainer.json
deleted file mode 100644
index 4a1bf2d5bbd..00000000000
--- a/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/devcontainer.json
+++ /dev/null
@@ -1,25 +0,0 @@
-// The command "tox -e update_docker_platforms"
-//   creates .devcontainer/portability-*-*/devcontainer.json
-//      from .devcontainer/portability-devcontainer.json.in
-// See https://aka.ms/devcontainer.json for format details.
-{
-    "name": "centos-7-devtoolset-gcc_11-standard (≥ 8-core)",
-    "build": {
-        "dockerfile": "portability-Dockerfile",
-        // See tox.ini for definitions
-        "args": {
-            "SYSTEM_FACTOR": "centos-7-devtoolset-gcc_11",
-            "PACKAGE_FACTOR": "standard",
-            "DOCKER_TARGET": "with-targets",
-            "DOCKER_TAG": "dev"
-        }
-    },
-    "containerEnv": {
-        "MAKE": "make -j4"
-    },
-    "onCreateCommand": ".devcontainer/onCreate.sh",
-    "updateContentCommand": ".devcontainer/portability-updateContent.sh",
-    "extensions": [
-        "ms-python.python"
-    ]
-}
diff --git a/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/portability-Dockerfile b/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/portability-Dockerfile
deleted file mode 120000
index 692e2a79d64..00000000000
--- a/.devcontainer/portability-centos-7-devtoolset-gcc_11-standard/portability-Dockerfile
+++ /dev/null
@@ -1 +0,0 @@
-../portability-Dockerfile
\ No newline at end of file
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index ebde1bfde8e..2b6d83f6e78 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -47,7 +47,6 @@ on:
            "fedora-38",
            "fedora-39",
            "fedora-40",
-           "centos-7-devtoolset-gcc_11",
            "centos-stream-9-python3.9",
            "almalinux-8-python3.9",
            "almalinux-9-python3.11",
diff --git a/src/doc/en/developer/portability_platform_table.rst b/src/doc/en/developer/portability_platform_table.rst
index 67ebb9f7c0b..617dfd0f868 100644
--- a/src/doc/en/developer/portability_platform_table.rst
+++ b/src/doc/en/developer/portability_platform_table.rst
@@ -1564,60 +1564,6 @@
 .. |codespace-fedora-40-maximal| image:: https://github.com/codespaces/badge.svg
    :target: https://codespaces.new/sagemath/sage?devcontainer_path=.devcontainer%2Fportability-fedora-40-maximal%2Fdevcontainer.json
 
-.. |image-centos-7-devtoolset-gcc_11-minimal-with-system-packages| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-system-packages/size?tag=dev&label=with-system-packages&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-system-packages
-
-.. |image-centos-7-devtoolset-gcc_11-minimal-configured| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-configured/latest_tag?ignore=latest,dev,*-failed&label=configured&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-configured
-
-.. |image-centos-7-devtoolset-gcc_11-minimal-with-targets-pre| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets-pre/latest_tag?ignore=latest,dev,*-failed&label=with-targets-pre&color=%23677895
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets-pre
-
-.. |image-centos-7-devtoolset-gcc_11-minimal-with-targets| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets/latest_tag?ignore=latest,dev,*-failed&label=with-targets&color=%236686c1
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets
-
-.. |image-centos-7-devtoolset-gcc_11-minimal-with-targets-optional| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets-optional/latest_tag?ignore=latest,dev,*-failed&label=with-targets-optional&color=%236495ed
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-minimal-with-targets-optional
-
-.. |codespace-centos-7-devtoolset-gcc_11-minimal| image:: https://github.com/codespaces/badge.svg
-   :target: https://codespaces.new/sagemath/sage?devcontainer_path=.devcontainer%2Fportability-centos-7-devtoolset-gcc_11-minimal%2Fdevcontainer.json
-
-.. |image-centos-7-devtoolset-gcc_11-standard-with-system-packages| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-system-packages/size?tag=dev&label=with-system-packages&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-system-packages
-
-.. |image-centos-7-devtoolset-gcc_11-standard-configured| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-configured/latest_tag?ignore=latest,dev,*-failed&label=configured&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-configured
-
-.. |image-centos-7-devtoolset-gcc_11-standard-with-targets-pre| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets-pre/latest_tag?ignore=latest,dev,*-failed&label=with-targets-pre&color=%235d8a4c
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets-pre
-
-.. |image-centos-7-devtoolset-gcc_11-standard-with-targets| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets/latest_tag?ignore=latest,dev,*-failed&label=with-targets&color=%2350ab2e
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets
-
-.. |image-centos-7-devtoolset-gcc_11-standard-with-targets-optional| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets-optional/latest_tag?ignore=latest,dev,*-failed&label=with-targets-optional&color=%2344cc11
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-standard-with-targets-optional
-
-.. |codespace-centos-7-devtoolset-gcc_11-standard| image:: https://github.com/codespaces/badge.svg
-   :target: https://codespaces.new/sagemath/sage?devcontainer_path=.devcontainer%2Fportability-centos-7-devtoolset-gcc_11-standard%2Fdevcontainer.json
-
-.. |image-centos-7-devtoolset-gcc_11-maximal-with-system-packages| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-system-packages/size?tag=dev&label=with-system-packages&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-system-packages
-
-.. |image-centos-7-devtoolset-gcc_11-maximal-configured| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-configured/latest_tag?ignore=latest,dev,*-failed&label=configured&color=%23696969
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-configured
-
-.. |image-centos-7-devtoolset-gcc_11-maximal-with-targets-pre| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets-pre/latest_tag?ignore=latest,dev,*-failed&label=with-targets-pre&color=%238f6b8d
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets-pre
-
-.. |image-centos-7-devtoolset-gcc_11-maximal-with-targets| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets/latest_tag?ignore=latest,dev,*-failed&label=with-targets&color=%23b46eb2
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets
-
-.. |image-centos-7-devtoolset-gcc_11-maximal-with-targets-optional| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets-optional/latest_tag?ignore=latest,dev,*-failed&label=with-targets-optional&color=%23da70d6
-   :target: https://ghcr.io/sagemath/sage/sage-centos-7-devtoolset-gcc_11-maximal-with-targets-optional
-
-.. |codespace-centos-7-devtoolset-gcc_11-maximal| image:: https://github.com/codespaces/badge.svg
-   :target: https://codespaces.new/sagemath/sage?devcontainer_path=.devcontainer%2Fportability-centos-7-devtoolset-gcc_11-maximal%2Fdevcontainer.json
-
 .. |image-centos-stream-9-python3.9-minimal-with-system-packages| image:: https://ghcr-badge.egpl.dev/sagemath/sage/sage-centos-stream-9-python3.9-minimal-with-system-packages/size?tag=dev&label=with-system-packages&color=%23696969
    :target: https://ghcr.io/sagemath/sage/sage-centos-stream-9-python3.9-minimal-with-system-packages
 
@@ -2647,17 +2593,6 @@
    * -    ‑*maximal*
      - |image-fedora-40-maximal-with-system-packages| |image-fedora-40-maximal-with-targets-pre|
      -
-   * - **centos**-7-devtoolset-gcc_11 
-       
-          ‑*minimal*
-     - |image-centos-7-devtoolset-gcc_11-minimal-with-system-packages| |image-centos-7-devtoolset-gcc_11-minimal-with-targets-pre| |image-centos-7-devtoolset-gcc_11-minimal-with-targets| |image-centos-7-devtoolset-gcc_11-minimal-with-targets-optional|
-     - |codespace-centos-7-devtoolset-gcc_11-minimal|
-   * -    ‑*standard*
-     - |image-centos-7-devtoolset-gcc_11-standard-with-system-packages| |image-centos-7-devtoolset-gcc_11-standard-with-targets-pre| |image-centos-7-devtoolset-gcc_11-standard-with-targets| |image-centos-7-devtoolset-gcc_11-standard-with-targets-optional|
-     - |codespace-centos-7-devtoolset-gcc_11-standard|
-   * -    ‑*maximal*
-     - |image-centos-7-devtoolset-gcc_11-maximal-with-system-packages| |image-centos-7-devtoolset-gcc_11-maximal-with-targets-pre|
-     -
    * - **centos**-stream-9-python3.9 
        
           ‑*minimal*
diff --git a/tox.ini b/tox.ini
index 2d90a0ba4f8..631a47ba3f6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -863,7 +863,6 @@ setenv =
                      debian-{bullseye,bookworm,trixie,sid} \
                      linuxmint-{20.1,20.2,20.3,21,21.1,21.2,21.3} \
                      fedora-{30,31,32,33,34,35,36,37,38,39,40} \
-                     centos-7-devtoolset-gcc_11 \
                      centos-stream-9-python3.9 \
                      almalinux-{8-python3.9,9-python3.11} \
                      gentoo-python{3.10,3.11,3.12} \