diff --git a/.changeset/curly-news-report.md b/.changeset/curly-news-report.md
new file mode 100644
index 0000000000..f2a7dee6d1
--- /dev/null
+++ b/.changeset/curly-news-report.md
@@ -0,0 +1,21 @@
+---
+'@backstage/plugin-kubernetes-backend': patch
+---
+
+**BREAKING** The kubernetes backend now can handle when req.header is undefined.
+
+These changes are **required** to `plugins/kubernetes-backend/src/service/KubernetesProxy.ts`
+
+```diff
+-- a/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
++++ b/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
+@@ -172,7 +172,7 @@ export class KubernetesProxy {
+             )?.toString(),
+           };
+
+-          const authHeader = req.header(HEADER_KUBERNETES_AUTH);
++          const authHeader = req.header?.(HEADER_KUBERNETES_AUTH);
+           if (authHeader) {
+             req.headers.authorization = authHeader;
+           } else {
+```
diff --git a/plugins/kubernetes-backend/src/service/KubernetesProxy.ts b/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
index b4536c5880..15b99e4180 100644
--- a/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
+++ b/plugins/kubernetes-backend/src/service/KubernetesProxy.ts
@@ -172,7 +172,7 @@ export class KubernetesProxy {
             )?.toString(),
           };
 
-          const authHeader = req.header(HEADER_KUBERNETES_AUTH);
+          const authHeader = req.header?.(HEADER_KUBERNETES_AUTH);
           if (authHeader) {
             req.headers.authorization = authHeader;
           } else {