diff --git a/.github/workflows/production-suite.yml b/.github/workflows/production-suite.yml
index 905073bb2d..41ad33390e 100644
--- a/.github/workflows/production-suite.yml
+++ b/.github/workflows/production-suite.yml
@@ -154,6 +154,11 @@ jobs:
             os: bookworm
             extra-args: --test-custom-db
 
+          - docker_image: zulip/ci:trixie
+            name: Debian 13 production install
+            os: trixie
+            extra-args: ""
+
     name: ${{ matrix.name  }}
     container:
       image: ${{ matrix.docker_image }}
diff --git a/.github/workflows/zulip-ci.yml b/.github/workflows/zulip-ci.yml
index 38eb252a8c..6069825e33 100644
--- a/.github/workflows/zulip-ci.yml
+++ b/.github/workflows/zulip-ci.yml
@@ -28,7 +28,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          # Base images are built using `tools/ci/Dockerfile.prod.template`.
+          # Base images are built using `tools/ci/Dockerfile`.
           # The comments at the top explain how to build and upload these images.
           # Ubuntu 22.04 ships with Python 3.10.12.
           - docker_image: zulip/ci:jammy
@@ -48,6 +48,12 @@ jobs:
             os: noble
             include_documentation_tests: false
             include_frontend_tests: false
+          # Debian 13 ships with Python 3.13.5.
+          - docker_image: zulip/ci:trixie
+            name: Debian 13 (Python 3.13, backend)
+            os: trixie
+            include_documentation_tests: false
+            include_frontend_tests: false
 
     runs-on: ubuntu-latest
     name: ${{ matrix.name }}
diff --git a/docs/development/setup-advanced.md b/docs/development/setup-advanced.md
index a031161f3d..05107815c2 100644
--- a/docs/development/setup-advanced.md
+++ b/docs/development/setup-advanced.md
@@ -20,7 +20,7 @@ host by following these instructions. Currently supported platforms
 are:
 
 - Ubuntu 22.04, 24.04
-- Debian 12
+- Debian 12, 13
 - CentOS 7 (beta)
 - Fedora 38 (beta)
 - RHEL 7 (beta)
diff --git a/docs/development/setup-recommended.md b/docs/development/setup-recommended.md
index 235700b8f2..51a140ee78 100644
--- a/docs/development/setup-recommended.md
+++ b/docs/development/setup-recommended.md
@@ -60,8 +60,8 @@ the internet.)
 :::{tab-item} Ubuntu/Debian
 :sync: os-ubuntu
 
-- Ubuntu 22.04, or 24.04
-- Debian 12
+- Ubuntu 22.04 or 24.04
+- Debian 12 or 13
   :::
 
 :::{tab-item} Fedora
diff --git a/docs/production/requirements.md b/docs/production/requirements.md
index 3467598ada..335f1ea450 100644
--- a/docs/production/requirements.md
+++ b/docs/production/requirements.md
@@ -7,6 +7,7 @@ To run a Zulip server, you will need:
   - Ubuntu 22.04
   - Ubuntu 24.04
   - Debian 12
+  - Debian 13
 - A supported CPU architecture:
   - x86-64
   - aarch64
@@ -37,7 +38,7 @@ on issues you'll encounter](install-existing-server.md).
 
 #### Operating system
 
-Ubuntu 22.04, Ubuntu 24.04, and Debian 12
+Ubuntu 22.04, Ubuntu 24.04, Debian 12, and Debian 13
 are supported for running Zulip in production. You can also
 run Zulip on other platforms that support Docker using
 [docker-zulip][docker-zulip-homepage].
diff --git a/scripts/lib/install b/scripts/lib/install
index a6badd4756..72878a13dd 100755
--- a/scripts/lib/install
+++ b/scripts/lib/install
@@ -361,6 +361,7 @@ Unsupported OS release: $os_id $os_version_id
 
 Zulip in production is supported only on:
  - Debian 12
+ - Debian 13
  - Ubuntu 22.04 LTS
  - Ubuntu 24.04 LTS
 EOF
diff --git a/scripts/lib/supported-os b/scripts/lib/supported-os
index 8582400f62..6d6802591d 100755
--- a/scripts/lib/supported-os
+++ b/scripts/lib/supported-os
@@ -16,7 +16,7 @@ if [ -f /etc/os-release ]; then
 fi
 
 case "$os_id $os_version_id" in
-    'debian 12' | 'ubuntu 22.04' | 'ubuntu 24.04')
+    'debian 12' | 'debian 13' | 'ubuntu 22.04' | 'ubuntu 24.04')
         exit 0
         ;;
     *)
diff --git a/scripts/setup/apt-repos/zulip/trixie.list b/scripts/setup/apt-repos/zulip/trixie.list
new file mode 100644
index 0000000000..882a15f230
--- /dev/null
+++ b/scripts/setup/apt-repos/zulip/trixie.list
@@ -0,0 +1,2 @@
+deb [signed-by=/etc/apt/keyrings/pgdg.asc] http://apt.postgresql.org/pub/repos/apt/ trixie-pgdg main
+deb-src [signed-by=/etc/apt/keyrings/pgdg.asc] http://apt.postgresql.org/pub/repos/apt/ trixie-pgdg main
diff --git a/tools/ci/build-docker-images b/tools/ci/build-docker-images
index 6c25e01e8d..3ad2f12e97 100755
--- a/tools/ci/build-docker-images
+++ b/tools/ci/build-docker-images
@@ -4,3 +4,4 @@ cd "$(dirname "${BASH_SOURCE[0]}")"
 docker build . --build-arg=BASE_IMAGE=ubuntu:22.04 --pull --tag=zulip/ci:jammy
 docker build . --build-arg=BASE_IMAGE=ubuntu:24.04 --pull --tag=zulip/ci:noble
 docker build . --build-arg=BASE_IMAGE=debian:12 --pull --tag=zulip/ci:bookworm
+docker build . --build-arg=BASE_IMAGE=debian:13 --pull --tag=zulip/ci:trixie
diff --git a/tools/lib/provision.py b/tools/lib/provision.py
index 04de87d087..72eeca4f09 100755
--- a/tools/lib/provision.py
+++ b/tools/lib/provision.py
@@ -77,6 +77,8 @@ vendor = distro_info["ID"]
 os_version = distro_info["VERSION_ID"]
 if vendor == "debian" and os_version == "12":  # bookworm
     POSTGRESQL_VERSION = "15"
+elif vendor == "debian" and os_version == "13":  # trixie
+    POSTGRESQL_VERSION = "17"
 elif vendor == "ubuntu" and os_version == "22.04":  # jammy
     POSTGRESQL_VERSION = "14"
 elif vendor == "ubuntu" and os_version == "24.04":  # noble
@@ -150,7 +152,7 @@ COMMON_YUM_DEPENDENCIES = [
 
 BUILD_GROONGA_FROM_SOURCE = False
 BUILD_PGROONGA_FROM_SOURCE = False
-if (vendor == "debian" and os_version in []) or (vendor == "ubuntu" and os_version in []):
+if (vendor == "debian" and os_version in ["13"]) or (vendor == "ubuntu" and os_version in []):
     # For platforms without a PGroonga release, we need to build it
     # from source.
     BUILD_PGROONGA_FROM_SOURCE = True