diff --git a/.github/workflows/ci-testing.yml b/.github/workflows/ci-testing.yml
index aaf3f46d..ed21e702 100644
--- a/.github/workflows/ci-testing.yml
+++ b/.github/workflows/ci-testing.yml
@@ -42,6 +42,7 @@ jobs:
           - v4.0.6
           - v4.0.7
           - v4.0.8
+          - v4.0.9
     steps:
       - uses: actions/checkout@v4
       - name: Set up Go
diff --git a/GNUmakefile b/GNUmakefile
index 264dbe20..95090841 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -3,7 +3,7 @@ TEST_FUNC?=TestAccNetboxEventRule_basic
 GOFMT_FILES?=$$(find . -name '*.go' | grep -v vendor)
 DOCKER_COMPOSE=docker compose
 
-export NETBOX_VERSION=v4.0.8
+export NETBOX_VERSION=v4.0.9
 export NETBOX_SERVER_URL=http://localhost:8001
 export NETBOX_API_TOKEN=0123456789abcdef0123456789abcdef01234567
 export NETBOX_TOKEN=$(NETBOX_API_TOKEN)
diff --git a/README.md b/README.md
index 63f3167e..ea9c9088 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ Since version [1.6.6](https://github.com/e-breuninger/terraform-provider-netbox/
 
 | Netbox version  | Provider version |
 | --------------- | ---------------- |
-| v4.0.0 - 4.0.8  | v3.9.0 and up    |
+| v4.0.0 - 4.0.9  | v3.9.0 and up    |
 | v3.7.0 - 3.7.8  | v3.8.0 - 3.8.9   |
 | v3.6.0 - 3.6.9  | v3.7.0 - 3.7.7   |
 | v3.5.1 - 3.5.9  | v3.6.x           |
diff --git a/docs/index.md b/docs/index.md
index c368233a..a17d5a18 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -16,7 +16,7 @@ Netbox often makes breaking API changes even in non-major releases. Check the ta
 
 | Netbox version  | Provider version |
 | --------------- | ---------------- |
-| v4.0.0 - 4.0.8  | v3.9.0 and up    |
+| v4.0.0 - 4.0.9  | v3.9.0 and up    |
 | v3.7.0 - 3.7.8  | v3.8.0 - 3.8.9   |
 | v3.6.0 - 3.6.9  | v3.7.0 - 3.7.7   |
 | v3.5.1 - 3.5.9  | v3.6.x           |
diff --git a/netbox/provider.go b/netbox/provider.go
index 56b576dc..e094a1ab 100644
--- a/netbox/provider.go
+++ b/netbox/provider.go
@@ -295,7 +295,7 @@ func providerConfigure(ctx context.Context, data *schema.ResourceData) (interfac
 
 		netboxVersion := res.GetPayload().(map[string]interface{})["netbox-version"].(string)
 
-		supportedVersions := []string{"4.0.0", "4.0.1", "4.0.2", "4.0.3", "4.0.5", "4.0.6", "4.0.7", "4.0.8"}
+		supportedVersions := []string{"4.0.0", "4.0.1", "4.0.2", "4.0.3", "4.0.5", "4.0.6", "4.0.7", "4.0.8", "4.0.9"}
 
 		if !slices.Contains(supportedVersions, netboxVersion) {
 			// Currently, there is no way to test these warnings. There is an issue to track this: https://github.com/hashicorp/terraform-plugin-sdk/issues/864
diff --git a/templates/index.md.tmpl b/templates/index.md.tmpl
index d5f5881b..8a3a3df9 100644
--- a/templates/index.md.tmpl
+++ b/templates/index.md.tmpl
@@ -16,7 +16,7 @@ Netbox often makes breaking API changes even in non-major releases. Check the ta
 
 | Netbox version  | Provider version |
 | --------------- | ---------------- |
-| v4.0.0 - 4.0.8  | v3.9.0 and up    |
+| v4.0.0 - 4.0.9  | v3.9.0 and up    |
 | v3.7.0 - 3.7.8  | v3.8.0 - 3.8.9   |
 | v3.6.0 - 3.6.9  | v3.7.0 - 3.7.7   |
 | v3.5.1 - 3.5.9  | v3.6.x           |