diff --git a/README.md b/README.md
index ccdfb3e..34e8ffc 100644
--- a/README.md
+++ b/README.md
@@ -66,6 +66,7 @@ You should be good to go!
 | `statefulset.actRunner.extraVolumeMounts` | Allows mounting extra volumes in the act runner container                                                                                   | `[]`                           |
 | `statefulset.actRunner.config`            | Act runner custom configuration. See [Act Runner documentation](https://docs.gitea.com/usage/actions/act-runner#configuration) for details. | `Too complex. See values.yaml` |
 | `statefulset.dind.registry`               | image registry, e.g. gcr.io,docker.io                                                                                                       | `""`                           |
+| `statefulset.actRunner.extraEnvs`         | Allows adding custom environment variables                                                                                                  | `[]`                           |
 | `statefulset.dind.repository`             | The Docker-in-Docker image                                                                                                                  | `docker`                       |
 | `statefulset.dind.tag`                    | The Docker-in-Docker image tag                                                                                                              | `28.3.3-dind`                  |
 | `statefulset.dind.digest`                 | Image digest. Allows to pin the given image tag. Useful for having control over mutable tags like `latest`                                  | `""`                           |
diff --git a/templates/statefulset.yaml b/templates/statefulset.yaml
index d8af2be..6635af3 100644
--- a/templates/statefulset.yaml
+++ b/templates/statefulset.yaml
@@ -66,6 +66,9 @@ spec:
               value: /actrunner/config.yaml
             - name: TZ
               value: {{ .Values.statefulset.timezone | default "Etc/UTC" }}
+            {{- if .Values.statefulset.actRunner.extraEnvs }}
+            {{- toYaml .Values.statefulset.actRunner.extraEnvs | nindent 12 }}
+            {{- end }}
           resources:
             {{- toYaml .Values.statefulset.resources | nindent 12 }}
           volumeMounts:
diff --git a/unittests/helm/statefulset.yaml b/unittests/helm/statefulset.yaml
index 93d6208..12e921c 100644
--- a/unittests/helm/statefulset.yaml
+++ b/unittests/helm/statefulset.yaml
@@ -129,6 +129,39 @@ tests:
       - equal:
           path: spec.template.spec.initContainers[0].image
           value: test.io/busybox:1.37.0
+  - it: renders additional environment variables for act-runner container in StatefulSet
+    template: templates/statefulset.yaml
+    set:
+      enabled: true
+      existingSecret: "my-secret"
+      existingSecretKey: "my-secret-key"
+      statefulset:
+        actRunner:
+          extraEnvs:
+            - name: "CUSTOM_ENV"
+              value: "1"
+            - name: "GITEA_RUNNER_NAME"
+              valueFrom:
+                fieldRef:
+                  fieldPath: metadata.name
+    asserts:
+      - hasDocuments:
+          count: 1
+      - containsDocument:
+          kind: StatefulSet
+          apiVersion: apps/v1
+          name: gitea-unittests-actions-act-runner
+      - equal:
+          path: spec.template.spec.containers[0].env[7]
+          value:
+            name: CUSTOM_ENV
+            value: "1"
+      - matchRegex:
+          path: spec.template.spec.containers[0].env[8].valueFrom.fieldRef.fieldPath
+          pattern: "metadata\\.name"
+      - matchRegex:
+          path: spec.template.spec.containers[0].env[8].name
+          pattern: "GITEA_RUNNER_NAME"
   - it: doesn't renders a StatefulSet by default
     template: templates/statefulset.yaml
     asserts:
diff --git a/values.yaml b/values.yaml
index 21a9813..2d12c7f 100644
--- a/values.yaml
+++ b/values.yaml
@@ -22,6 +22,7 @@
 ## @param statefulset.actRunner.extraVolumeMounts Allows mounting extra volumes in the act runner container
 ## @param statefulset.actRunner.config [default: Too complex. See values.yaml] Act runner custom configuration. See [Act Runner documentation](https://docs.gitea.com/usage/actions/act-runner#configuration) for details.
 ## @param statefulset.dind.registry image registry, e.g. gcr.io,docker.io
+## @param statefulset.actRunner.extraEnvs Allows adding custom environment variables
 ## @param statefulset.dind.repository The Docker-in-Docker image
 ## @param statefulset.dind.tag The Docker-in-Docker image tag
 ## @param statefulset.dind.digest Image digest. Allows to pin the given image tag. Useful for having control over mutable tags like `latest`
@@ -53,6 +54,12 @@ statefulset:
     pullPolicy: IfNotPresent
     fullOverride: ""
     extraVolumeMounts: []
+    extraEnvs:
+      []
+      # - name: "GITEA_RUNNER_NAME"
+      #   valueFrom:
+      #     fieldRef:
+      #       fieldPath: metadata.name
 
     # See full example here: https://gitea.com/gitea/act_runner/src/branch/main/internal/pkg/config/config.example.yaml
     config: |