diff --git a/.circleci/config.yml b/.circleci/config.yml
index b4d8d1a2e..7af63f349 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -161,6 +161,33 @@ jobs:
           command: |
             poetry run make test
 
+  ci-ubuntu-mantic:
+    machine:
+      image: ubuntu-2004:202111-01
+    steps:
+      - checkout
+      - run: *install-podman
+
+      - run:
+          name: Prepare cache directory
+          command: |
+            sudo mkdir -p /caches
+            sudo chown -R $USER:$USER /caches
+      - run: *calculate-cache-key
+      - restore_cache: *restore-cache
+      - run: *copy-image
+
+      - run:
+          name: Prepare Dangerzone environment
+          command: |
+            ./dev_scripts/env.py --distro ubuntu --version 23.10 build-dev
+
+      - run:
+          name: Run CI tests
+          command: |
+            ./dev_scripts/env.py --distro ubuntu --version 23.10 run --dev \
+                bash -c 'cd dangerzone; poetry run make test'
+
   ci-ubuntu-lunar:
     machine:
       image: ubuntu-2004:202111-01
@@ -410,9 +437,21 @@ jobs:
             ./dev_scripts/env.py --distro debian --version bullseye run --dev \
                 bash -c 'cd dangerzone; poetry run make test'
 
+  build-ubuntu-mantic:
+    docker:
+      - image: ubuntu:23.10
+    resource_class: medium+
+    steps:
+      - run: *install-dependencies-deb
+      - checkout
+      - run: *calculate-cache-key
+      - restore_cache: *restore-cache
+      - run: *copy-image
+      - run: *build-deb
+
   build-ubuntu-lunar:
     docker:
-      - image: ubuntu:22.04
+      - image: ubuntu:23.04
     resource_class: medium+
     steps:
       - run: *install-dependencies-deb
@@ -519,6 +558,9 @@ workflows:
       - convert-test-docs:
           requires:
             - build-container-image
+      - ci-ubuntu-mantic:
+          requires:
+            - build-container-image
       - ci-ubuntu-lunar:
           requires:
             - build-container-image
@@ -543,6 +585,9 @@ workflows:
       - ci-fedora-37:
           requires:
             - build-container-image
+      - build-ubuntu-mantic:
+          requires:
+            - build-container-image
       - build-ubuntu-lunar:
           requires:
             - build-container-image
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 278836672..4ac8c0488 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -92,6 +92,9 @@ jobs:
           - target: ubuntu-23.04
             distro: ubuntu
             version: "23.04"
+          - target: ubuntu-23.10
+            distro: ubuntu
+            version: "23.10"
           - target: debian-bullseye
             distro: debian
             version: bullseye
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6940881e3..ef0cb1cbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ since 0.4.1, and this project adheres to [Semantic Versioning](https://semver.or
 ### Added
 
 - Platform support: Beta integration with Qubes OS ([issue #412](https://github.com/freedomofpress/dangerzone/issues/412))
+- Platform support: Ubuntu 23.10 (Mantic Minotaur) ([issue #601](https://github.com/freedomofpress/dangerzone/issues/601))
 - Add client-side timeouts in Qubes ([issue #446](https://github.com/freedomofpress/dangerzone/issues/446))
 - Add installation instructions for Qubes ([issue #431](https://github.com/freedomofpress/dangerzone/issues/431))
 - Development: Add tests that run Dangerzone against a pool of roughly 11K documents ([PR #386](https://github.com/freedomofpress/dangerzone/pull/386))
diff --git a/INSTALL.md b/INSTALL.md
index 6dadf6af2..b2b239ee3 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -9,6 +9,7 @@ On Linux, Dangerzone uses [Podman](https://podman.io/) instead of Docker Desktop
 an isolated environment. It will be installed automatically when installing Dangerzone.
 
 Dangerzone is available for:
+- Ubuntu 23.10 (mantic)
 - Ubuntu 23.04 (lunar)
 - Ubuntu 22.04 (jammy)
 - Ubuntu 20.04 (focal)
diff --git a/dev_scripts/env.py b/dev_scripts/env.py
index 588bac37b..bec9ea544 100755
--- a/dev_scripts/env.py
+++ b/dev_scripts/env.py
@@ -73,7 +73,7 @@
 # XXX: overcome the fact that ubuntu images (starting on 23.04) ship with the 'ubuntu'
 # user by default https://bugs.launchpad.net/cloud-images/+bug/2005129
 # Related issue https://github.com/freedomofpress/dangerzone/pull/461
-DOCKERFILE_UBUNTU_2304_REM_USER = r"""
+DOCKERFILE_UBUNTU_REM_USER = r"""
 RUN touch /var/mail/ubuntu && chown ubuntu /var/mail/ubuntu && userdel -r ubuntu
 """
 
@@ -432,9 +432,14 @@ def build_dev(self, show_dockerfile=DEFAULT_SHOW_DOCKERFILE):
                 # Ubuntu Jammy misses a dependency to `libxkbcommon-x11-0`, which we can
                 # install indirectly via `qt6-qpa-plugins`.
                 qt_deps += " qt6-qpa-plugins"
-            elif self.distro == "ubuntu" and self.version in ("23.04", "lunar"):
+            elif self.distro == "ubuntu" and self.version in (
+                "23.04",
+                "23.10",
+                "lunar",
+                "mantic",
+            ):
                 install_deps = (
-                    DOCKERFILE_UBUNTU_2304_REM_USER + DOCKERFILE_BUILD_DEV_DEBIAN_DEPS
+                    DOCKERFILE_UBUNTU_REM_USER + DOCKERFILE_BUILD_DEV_DEBIAN_DEPS
                 )
             elif self.distro == "debian" and self.version in ("bullseye-backports",):
                 # Debian Bullseye misses a dependency to libgl1.
@@ -479,9 +484,7 @@ def build(self, show_dockerfile=DEFAULT_SHOW_DOCKERFILE):
                     DOCKERFILE_UBUNTU_2004_DEPS + DOCKERFILE_BUILD_DEBIAN_DEPS
                 )
             elif self.distro == "ubuntu" and self.version in ("23.04", "lunar"):
-                install_deps = (
-                    DOCKERFILE_UBUNTU_2304_REM_USER + DOCKERFILE_BUILD_DEBIAN_DEPS
-                )
+                install_deps = DOCKERFILE_UBUNTU_REM_USER + DOCKERFILE_BUILD_DEBIAN_DEPS
             package = f"dangerzone_{version}-1_all.deb"
             package_src = git_root() / "deb_dist" / package
             package_dst = build_dir / package
diff --git a/dev_scripts/qa.py b/dev_scripts/qa.py
index 81e877180..d88bcf594 100755
--- a/dev_scripts/qa.py
+++ b/dev_scripts/qa.py
@@ -860,6 +860,11 @@ class QAUbuntu2304(QADebianBased):
     VERSION = "23.04"
 
 
+class QAUbuntu2310(QADebianBased):
+    DISTRO = "ubuntu"
+    VERSION = "23.10"
+
+
 class QAFedora(QALinux):
     """Base class for Fedora distros.