diff --git a/.github/workflows/helm_charts_scalar.yml b/.github/workflows/helm_charts_scalar.yml
index f3e14a62..6551f7a9 100644
--- a/.github/workflows/helm_charts_scalar.yml
+++ b/.github/workflows/helm_charts_scalar.yml
@@ -98,11 +98,11 @@ jobs:
     strategy:
       matrix:
         k8s:
-          - v1.26.15
-          - v1.27.13
-          - v1.28.9
-          - v1.29.4
-          - v1.30.0
+          - v1.27.16
+          - v1.28.13
+          - v1.29.8
+          - v1.30.4
+          - v1.31.0
 
     steps:
       - name: Checkout
@@ -149,11 +149,11 @@ jobs:
     strategy:
       matrix:
         k8s:
-          - v1.26.15
-          - v1.27.13
-          - v1.28.9
-          - v1.29.4
-          - v1.30.0
+          - v1.27.16
+          - v1.28.13
+          - v1.29.8
+          - v1.30.4
+          - v1.31.0
 
     steps:
       - name: Checkout
diff --git a/README.md b/README.md
index 2379b301..89553beb 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,11 @@ This directory contains the following helm charts.
 
 ## Prerequisites
 
-* Helm 3.5+
+You need the [`helm`](https://helm.sh/docs/intro/install/) command. For details on supported Helm versions, see the [Package manager section in the Requirements document](https://scalardb.scalar-labs.com/docs/latest/requirements/#package-manager).
 
 ## Supported Kubernetes versions
 
-* 1.30.x, 1.29.x, 1.28.x, 1.27.x, 1.26.x
+For details on supported Kubernetes versions, see the [Kubernetes section in the Requirements document](https://scalardb.scalar-labs.com/docs/latest/requirements/#platform).
 
 We decide which versions to support based on the supported versions in [Amazon Elastic Kubernetes Service](https://docs.aws.amazon.com/eks/latest/userguide/kubernetes-versions.html) and [Azure Kubernetes Service](https://learn.microsoft.com/en-us/azure/aks/supported-kubernetes-versions). However, we do not consider the LTS versions in each managed Kubernetes service.