diff --git a/changelog.d/20260907_142947_41898282+github-actions[bot]_mongodb.md b/changelog.d/20260907_142947_41898282+github-actions[bot]_mongodb.md
new file mode 100644
index 0000000000..2c93dddd8b
--- /dev/null
+++ b/changelog.d/20260907_142947_41898282+github-actions[bot]_mongodb.md
@@ -0,0 +1 @@
+- [Improvement] Upgrade MongoDB from 7.0.39 to 7.0.40. (by @github-actions[bot])
diff --git a/docs/configuration.rst b/docs/configuration.rst
index 2fbde0695f..4265da9b9e 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -75,7 +75,7 @@ This configuration parameter defines which Caddy Docker image to use.
 
 This configuration parameter defines which Meilisearch Docker image to use.
 
-- ``DOCKER_IMAGE_MONGODB`` (default: ``"docker.io/mongo:7.0.39"``)
+- ``DOCKER_IMAGE_MONGODB`` (default: ``"docker.io/mongo:7.0.40"``)
 
 This configuration parameter defines which MongoDB Docker image to use.
 
diff --git a/tutor/templates/config/defaults.yml b/tutor/templates/config/defaults.yml
index f3c9d6f4e4..bde8f242b3 100644
--- a/tutor/templates/config/defaults.yml
+++ b/tutor/templates/config/defaults.yml
@@ -19,7 +19,7 @@ DOCKER_IMAGE_CADDY: "docker.io/caddy:2.11.4"
 # https://hub.docker.com/r/getmeili/meilisearch/tags
 DOCKER_IMAGE_MEILISEARCH: "docker.io/getmeili/meilisearch:v1.36.0"
 # https://hub.docker.com/_/mongo/tags
-DOCKER_IMAGE_MONGODB: "docker.io/mongo:7.0.39"
+DOCKER_IMAGE_MONGODB: "docker.io/mongo:7.0.40"
 # https://hub.docker.com/_/mysql/tags
 DOCKER_IMAGE_MYSQL: "docker.io/mysql:8.4.11"
 DOCKER_IMAGE_PERMISSIONS: "{{ DOCKER_REGISTRY }}overhangio/openedx-permissions:{{ TUTOR_VERSION }}"