diff --git a/src/mgr/session-pvc.ts b/src/mgr/session-pvc.ts
index e9d75f3..2063d79 100644
--- a/src/mgr/session-pvc.ts
+++ b/src/mgr/session-pvc.ts
@@ -36,6 +36,7 @@ export interface SessionPvcOptions {
 const defaultStorageClassName = "local-path";
 const defaultPvcSize = "1Gi";
 const defaultSubdir = "sessions";
+const defaultNamespace = "agentrun-v01";
 
 export function sessionPvcNameFor(sessionId: string): string {
   const sanitized = sanitizeSessionIdForPvc(sessionId);
@@ -45,8 +46,19 @@ export function sessionPvcNameFor(sessionId: string): string {
 export function sanitizeSessionIdForPvc(sessionId: string): string {
   return sessionId.toLowerCase().replace(/[^a-z0-9-]+/gu, "-").replace(/^-+|-+$/gu, "");
 }
+
+function runtimeNamespace(): string {
+  const value = process.env.AGENTRUN_RUNTIME_NAMESPACE?.trim();
+  return value && value.length > 0 ? value : defaultNamespace;
+}
+
+function runtimeLane(): string {
+  const value = process.env.AGENTRUN_LANE?.trim();
+  return value && value.length > 0 ? value : "v0.1";
+}
+
 export function buildSessionPvcSpec(input: { sessionId: string; namespace?: string; options: SessionPvcOptions }): SessionPvcSpec {
-  const namespace = input.namespace ?? "agentrun-v01";
+  const namespace = input.namespace ?? runtimeNamespace();
   return {
     pvcName: sessionPvcNameFor(input.sessionId),
     namespace,
@@ -84,7 +96,7 @@ export async function createSessionPvc(input: { store: AgentRunStore; sessionId:
   const manifest: JsonRecord = {
     apiVersion: "v1",
     kind: "PersistentVolumeClaim",
-    metadata: { name: spec.pvcName, namespace: spec.namespace, labels: { "agentrun.pikastech.local/session-id": input.sessionId, "agentrun.pikastech.local/lane": "v0.1" } },
+    metadata: { name: spec.pvcName, namespace: spec.namespace, labels: { "agentrun.pikastech.local/session-id": input.sessionId, "agentrun.pikastech.local/lane": runtimeLane() } },
     spec: { accessModes: ["ReadWriteOnce"], storageClassName: spec.storageClassName, resources: { requests: { storage: spec.size } } },
   };
   const handler = resolveHandler(input.options);
@@ -221,7 +233,7 @@ export async function runSessionStorageGc(input: { store: AgentRunStore; options
     if (session.activeRunId || session.activeCommandId) { skipped++; continue; }
     if (session.storageKind !== "pvc" || !session.storagePvcName) { skipped++; continue; }
     try {
-      await handler({ args: ["delete", "pvc", session.storagePvcName, "-n", session.storageNamespace ?? "agentrun-v01", "--ignore-not-found"] });
+      await handler({ args: ["delete", "pvc", session.storagePvcName, "-n", session.storageNamespace ?? runtimeNamespace(), "--ignore-not-found"] });
       await input.store.markSessionStorageEvicted({ sessionId: session.sessionId, pvcName: session.storagePvcName });
       deleted++;
       deletedPvcNames.push(session.storagePvcName);
diff --git a/src/selftest/cases/10-mgr-session-pvc.ts b/src/selftest/cases/10-mgr-session-pvc.ts
index 60e1caf..28e2142 100644
--- a/src/selftest/cases/10-mgr-session-pvc.ts
+++ b/src/selftest/cases/10-mgr-session-pvc.ts
@@ -2,7 +2,7 @@ import assert from "node:assert/strict";
 import { startManagerServer } from "../../mgr/server.js";
 import { MemoryAgentRunStore } from "../../mgr/store.js";
 import { ManagerClient } from "../../mgr/client.js";
-import { createSessionPvc, deleteSessionPvc, getSessionPvcSummary, refreshSessionPvcSummary, runSessionStorageGc, sessionPvcNameFor, sanitizeSessionIdForPvc } from "../../mgr/session-pvc.js";
+import { buildSessionPvcSpec, createSessionPvc, deleteSessionPvc, getSessionPvcSummary, refreshSessionPvcSummary, runSessionStorageGc, sessionPvcNameFor, sanitizeSessionIdForPvc } from "../../mgr/session-pvc.js";
 import type { KubectlHandler, SessionPvcOptions } from "../../mgr/session-pvc.js";
 import type { SelfTestCase } from "../harness.js";
 
@@ -35,6 +35,16 @@ const selfTest: SelfTestCase = async () => {
   assert.equal(sessionPvcNameFor("sess_with_underscores_001"), "agentrun-v01-session-sess-with-underscores-001");
   assert.equal(sessionPvcNameFor("Sess.UPPER.001"), "agentrun-v01-session-sess-upper-001");
   assert.equal(sessionPvcNameFor("---"), "agentrun-v01-session-default");
+  const previousRuntimeNamespace = process.env.AGENTRUN_RUNTIME_NAMESPACE;
+  try {
+    delete process.env.AGENTRUN_RUNTIME_NAMESPACE;
+    assert.equal(buildSessionPvcSpec({ sessionId: "sess_default_namespace", options: opts }).namespace, "agentrun-v01");
+    process.env.AGENTRUN_RUNTIME_NAMESPACE = "agentrun-v02";
+    assert.equal(buildSessionPvcSpec({ sessionId: "sess_runtime_namespace", options: opts }).namespace, "agentrun-v02");
+  } finally {
+    if (previousRuntimeNamespace === undefined) delete process.env.AGENTRUN_RUNTIME_NAMESPACE;
+    else process.env.AGENTRUN_RUNTIME_NAMESPACE = previousRuntimeNamespace;
+  }
   const after = await store.getSession(sessionId);
   assert.equal(after?.storageKind, "pvc");
   assert.equal(after?.storagePvcName, summary.pvcName);