diff --git a/CHANGELOG.md b/CHANGELOG.md
index b4b1eb15..ba0a074b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ All notable changes to this project will be documented in this file.
   - Use `--file-log-max-files` (or `FILE_LOG_MAX_FILES`) to limit the number of log files kept.
   - Use `--file-log-rotation-period` (or `FILE_LOG_ROTATION_PERIOD`) to configure the frequency of rotation.
   - Use `--console-log-format` (or `CONSOLE_LOG_FORMAT`) to set the format to `plain` (default) or `json`.
+- Add support for Kafka 3.9.1 ([#866]).
 
 ### Changed
 
@@ -49,6 +50,7 @@ All notable changes to this project will be documented in this file.
 [#860]: https://github.com/stackabletech/kafka-operator/pull/860
 [#861]: https://github.com/stackabletech/kafka-operator/pull/861
 [#862]: https://github.com/stackabletech/kafka-operator/pull/862
+[#866]: https://github.com/stackabletech/kafka-operator/pull/866
 [#868]: https://github.com/stackabletech/kafka-operator/pull/868
 
 ## [25.3.0] - 2025-03-21
diff --git a/docs/modules/kafka/examples/getting_started/kafka.yaml b/docs/modules/kafka/examples/getting_started/kafka.yaml
index 5b5218e8..4b75bbe7 100644
--- a/docs/modules/kafka/examples/getting_started/kafka.yaml
+++ b/docs/modules/kafka/examples/getting_started/kafka.yaml
@@ -5,7 +5,7 @@ metadata:
   name: simple-kafka
 spec:
   image:
-    productVersion: 3.9.0
+    productVersion: 3.9.1
   clusterConfig:
     tls:
       serverSecretClass: null
diff --git a/docs/modules/kafka/partials/supported-versions.adoc b/docs/modules/kafka/partials/supported-versions.adoc
index f5f84f8f..4a4b9ab1 100644
--- a/docs/modules/kafka/partials/supported-versions.adoc
+++ b/docs/modules/kafka/partials/supported-versions.adoc
@@ -2,5 +2,6 @@
 // This is a separate file, since it is used by both the direct Kafka documentation, and the overarching
 // Stackable Platform documentation.
 
-* 3.9.0
+* 3.9.1
+* 3.9.0 (deprecated)
 * 3.7.2 (LTS)
diff --git a/tests/test-definition.yaml b/tests/test-definition.yaml
index 560d7daa..da16182f 100644
--- a/tests/test-definition.yaml
+++ b/tests/test-definition.yaml
@@ -8,6 +8,7 @@ dimensions:
     values:
       - 3.7.2
       - 3.9.0
+      - 3.9.1
       # Alternatively, if you want to use a custom image, append a comma and the full image name to the product version
       # as in the example below.
       # - 3.8.0,oci.stackable.tech/sdp/kafka:3.8.0-stackable0.0.0-dev
@@ -28,7 +29,7 @@ dimensions:
       - 3.7.2
   - name: upgrade_new
     values:
-      - 3.9.0
+      - 3.9.1
   - name: use-client-tls
     values:
       - "true"