diff --git a/stable/atlantis/Chart.yaml b/stable/atlantis/Chart.yaml
index 7da90acb3f..ab9db22eef 100644
--- a/stable/atlantis/Chart.yaml
+++ b/stable/atlantis/Chart.yaml
@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: "v0.7.1"
 description: A Helm chart for Atlantis https://www.runatlantis.io
 name: atlantis
-version: 3.0.0
+version: 3.1.0
 keywords:
 - terraform
 home: https://www.runatlantis.io
diff --git a/stable/atlantis/README.md b/stable/atlantis/README.md
index 72e9e94d92..883f3db494 100644
--- a/stable/atlantis/README.md
+++ b/stable/atlantis/README.md
@@ -46,6 +46,8 @@ The following options are supported.  See [values.yaml](values.yaml) for more de
 | `logLevel`                                  | Level to use for logging. Either debug, info, warn, or error.                                                                                                                                                                                                                                             | n/a     |
 | `orgWhiteList`                              | Whitelist of repositories from which Atlantis will accept webhooks. **This value must be set for Atlantis to function correctly.** Accepts wildcard characters (`*`). Multiple values may be comma-separated.                                                                                             | none    |
 | `repoConfig`                                | [Server Side Repo Configuration](https://www.runatlantis.io/docs/server-side-repo-config.html) as a raw YAML string. Configuration is stored in ConfigMap.                                                                                                                                                | n/a     |
+| `defaultTFVersion`                          | Default Terraform version to be used by atlantis server                                                                                                                                                                                                                                                   | n/a     |
+| `allowForkPRs`                              | Allow atlantis to run on fork Pull Requests                                                                                                                                                                                                                                                               | `false` |
 | `serviceAccount.create`                     | Whether to create a Kubernetes ServiceAccount if no account matching `serviceAccount.name` exists.                                                                                                                                                                                                        | `true`  |
 | `serviceAccount.name`                       | Name of the Kubernetes ServiceAccount under which Atlantis should run. If no value is specified and `serviceAccount.create` is `true`, Atlantis will be run under a ServiceAccount whose name is the FullName of the Helm chart's instance, else Atlantis will be run under the `default` ServiceAccount. | n/a     |
 | `serviceAccountSecrets.credentials`         | JSON string representing secrets for a Google Cloud Platform production service account. Only applicable if hosting Atlantis on GKE.                                                                                                                                                                      | n/a     |
diff --git a/stable/atlantis/templates/statefulset.yaml b/stable/atlantis/templates/statefulset.yaml
index fb184ad0ac..a28c4997b0 100644
--- a/stable/atlantis/templates/statefulset.yaml
+++ b/stable/atlantis/templates/statefulset.yaml
@@ -74,6 +74,12 @@ spec:
           {{- end}}
           args:
             - server
+          {{- if .Values.allowForkPRs }}
+            - --allow-fork-prs
+          {{- end }}
+          {{- if .Values.defaultTFVersion }}
+            - --default-tf-version={{ .Values.defaultTFVersion }}
+          {{- end }}
           ports:
           - name: atlantis
             containerPort: 4141
diff --git a/stable/atlantis/values.yaml b/stable/atlantis/values.yaml
index 1f302f8b4d..20a64bb8df 100644
--- a/stable/atlantis/values.yaml
+++ b/stable/atlantis/values.yaml
@@ -103,6 +103,12 @@ image:
 #      apply:
 #        steps: [apply]
 
+# allowForkPRs enables atlantis to run on a fork Pull Requests
+allowForkPRs: false
+
+## defaultTFVersion set the default terraform version to be used in atlantis server
+# defaultTFVersion: v0.12.0
+
 # We only need to check every 60s since Atlantis is not a high-throughput service.
 livenessProbe:
   enabled: true