diff --git a/.testing/netbox.Containerfile b/.testing/netbox.Containerfile
index 0951e40..cdf8519 100644
--- a/.testing/netbox.Containerfile
+++ b/.testing/netbox.Containerfile
@@ -1,4 +1,4 @@
-FROM docker.io/netboxcommunity/netbox:latest
+FROM docker.io/netboxcommunity/netbox:v4.0
 
 COPY ./requirements-plugin.txt /opt/netbox/
 RUN /opt/netbox/venv/bin/pip install \
diff --git a/.testing/requirements-plugin.txt b/.testing/requirements-plugin.txt
index 46b9cf3..20533b9 100644
--- a/.testing/requirements-plugin.txt
+++ b/.testing/requirements-plugin.txt
@@ -1 +1 @@
-netbox-plugin-dns >= 0.22.8
+netbox-plugin-dns >= 1.0.0
diff --git a/README.md b/README.md
index 49b12d6..a8b5b7b 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,8 @@ The *netboxdns* plugin provides resolution for zones configured using
 
 **Depends on `netbox-plugin-dns` version `0.22.8` or greater.**
 
+**Validated for `netbox` >= v4.0.2 and `netbox-plugin-dns` >= v1.0.0.**
+
 The account that the API token is tied to will need the following permissions:
 
 - `netbox_dns.view_zone`