diff --git a/changelog.md b/changelog.md
index 542e95f..7fce514 100644
--- a/changelog.md
+++ b/changelog.md
@@ -12,6 +12,7 @@
 ### Maintenance
 
 - refresh release tooling dependencies
+- update `@serve.zone/interfaces` to the Spark telemetry contract release
 
 ## 2026-05-24 - 5.8.2
 
diff --git a/package.json b/package.json
index 628cdd2..75333d5 100644
--- a/package.json
+++ b/package.json
@@ -79,7 +79,7 @@
     "@push.rocks/taskbuffer": "^8.0.2",
     "@push.rocks/webjwt": "^1.0.10",
     "@serve.zone/api": "^5.3.8",
-    "@serve.zone/interfaces": "^5.9.0",
+    "@serve.zone/interfaces": "^5.10.0",
     "@tsclass/tsclass": "^9.5.1"
   },
   "files": [
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fdededb..23b988e 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -144,8 +144,8 @@ importers:
         specifier: ^5.3.8
         version: 5.3.8(@push.rocks/smartserve@2.0.4)
       '@serve.zone/interfaces':
-        specifier: ^5.9.0
-        version: 5.9.0
+        specifier: ^5.10.0
+        version: 5.10.0
       '@tsclass/tsclass':
         specifier: ^9.5.1
         version: 9.5.1
@@ -2030,6 +2030,9 @@ packages:
   '@serve.zone/api@5.3.8':
     resolution: {integrity: sha512-k3IU4mcHuk5pKB+X7rhYWGK+j5hyyDzFoqR3ytzG1iidvgDEIIToQJq+mB3E1v6X1+tI3WyYUaMN/TaZRz0l0w==}
 
+  '@serve.zone/interfaces@5.10.0':
+    resolution: {integrity: sha512-8ZnP1A43UZlYwfd2j+S0Yin//didacIX2Rou9MobRuSFFgi1RQOqQcIWqOINcDk80wBDuYkyMCwHygYxD5i+Ig==}
+
   '@serve.zone/interfaces@5.9.0':
     resolution: {integrity: sha512-XMXyTXTMcB8AX6zYOMO+Jt5bOv9ujyXj5miE6lrgyT8g+eJ/I6sUFqVNUKJ3LiMk/yFWsPln7HtZeZKDEhaCwQ==}
 
@@ -7776,6 +7779,12 @@ snapshots:
     transitivePeerDependencies:
       - '@push.rocks/smartserve'
 
+  '@serve.zone/interfaces@5.10.0':
+    dependencies:
+      '@api.global/typedrequest-interfaces': 3.0.19
+      '@push.rocks/smartlog-interfaces': 3.0.2
+      '@tsclass/tsclass': 9.5.1
+
   '@serve.zone/interfaces@5.9.0':
     dependencies:
       '@api.global/typedrequest-interfaces': 3.0.19
diff --git a/ts/manager.node/classes.clusternode.ts b/ts/manager.node/classes.clusternode.ts
index 76c6c21..9694ba7 100644
--- a/ts/manager.node/classes.clusternode.ts
+++ b/ts/manager.node/classes.clusternode.ts
@@ -59,12 +59,10 @@ export class ClusterNode extends plugins.smartdata.SmartDataDbDoc<
 
   public async updateSparkHeartbeat(
     metricsArg: plugins.servezoneInterfaces.data.IClusterNodeMetrics,
-    runtimeInfoArg: Record<string, unknown>,
+    runtimeInfoArg: plugins.servezoneInterfaces.data.ISparkNodeRuntimeInfo,
   ) {
     this.data.metrics = metricsArg;
-    (this.data as plugins.servezoneInterfaces.data.IClusterNode['data'] & {
-      sparkRuntimeInfo?: Record<string, unknown>;
-    }).sparkRuntimeInfo = runtimeInfoArg;
+    this.data.sparkRuntimeInfo = runtimeInfoArg;
     this.data.status = 'online';
     this.data.lastHealthCheck = Date.now();
     if (typeof runtimeInfoArg.swarmNodeId === 'string' && runtimeInfoArg.swarmNodeId) {
diff --git a/ts/manager.node/classes.nodemanager.ts b/ts/manager.node/classes.nodemanager.ts
index 16d20d7..5caef4c 100644
--- a/ts/manager.node/classes.nodemanager.ts
+++ b/ts/manager.node/classes.nodemanager.ts
@@ -8,7 +8,7 @@ interface ISparkHeartbeatRequest {
   nodeId?: string;
   nodeToken?: string;
   metrics?: plugins.servezoneInterfaces.data.IClusterNodeMetrics;
-  runtimeInfo?: Record<string, unknown>;
+  runtimeInfo?: plugins.servezoneInterfaces.data.ISparkNodeRuntimeInfo;
 }
 
 interface ISparkHeartbeatResponse {
@@ -223,7 +223,10 @@ export class CloudlyNodeManager {
       && typeof metrics.timestamp === 'number';
   }
 
-  private isSparkRuntimeInfo(valueArg: unknown, nodeIdArg: string): valueArg is Record<string, unknown> {
+  private isSparkRuntimeInfo(
+    valueArg: unknown,
+    nodeIdArg: string,
+  ): valueArg is plugins.servezoneInterfaces.data.ISparkNodeRuntimeInfo {
     if (!valueArg || typeof valueArg !== 'object') {
       return false;
     }