diff --git a/CHANGELOG.md b/CHANGELOG.md
index a2fba287..444aa17b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## master / unreleased
 
+* [DEPENDENCY] update nginx docker tag to v1.31 #629
 * [DEPENDENCY] update memcached docker tag to v1.6.42 #631
 
 ## 3.3.0 / 2026-04-27
diff --git a/README.md b/README.md
index 6535001f..3d71fb0c 100644
--- a/README.md
+++ b/README.md
@@ -494,7 +494,7 @@ Kubernetes: `^1.19.0-0`
 | nginx.​http_listen_port | int | `80` |  |
 | nginx.​image.​pullPolicy | string | `"IfNotPresent"` |  |
 | nginx.​image.​repository | string | `"nginx"` |  |
-| nginx.​image.​tag | float | `1.29` |  |
+| nginx.​image.​tag | float | `1.31` |  |
 | nginx.​initContainers | list | `[]` |  |
 | nginx.​livenessProbe.​httpGet.​path | string | `"/healthz"` |  |
 | nginx.​livenessProbe.​httpGet.​port | string | `"http-metrics"` |  |
diff --git a/values.yaml b/values.yaml
index 1c9e0c19..28d6f4d0 100644
--- a/values.yaml
+++ b/values.yaml
@@ -1359,7 +1359,7 @@ nginx:
     override_push_endpoint: ""
   image:
     repository: nginx
-    tag: 1.29
+    tag: 1.31
     pullPolicy: IfNotPresent
 
   service: