diff --git a/package.json b/package.json
index 5c567e5bc9..c9798fc86a 100644
--- a/package.json
+++ b/package.json
@@ -129,7 +129,7 @@
     "ts-toolbelt": "^9.6.0",
     "type-is": "^1.6.18",
     "ulidx": "^2.4.1",
-    "unleash-client": "^6.6.0",
+    "unleash-client": "^6.7.0-beta.0",
     "uuid": "^9.0.0"
   },
   "devDependencies": {
diff --git a/src/lib/types/experimental.ts b/src/lib/types/experimental.ts
index 5d2f714e73..289da824e1 100644
--- a/src/lib/types/experimental.ts
+++ b/src/lib/types/experimental.ts
@@ -314,10 +314,19 @@ export interface IFlagResolver {
     isEnabled: (expName: IFlagKey, context?: IFlagContext) => boolean;
     getVariant: (expName: IFlagKey, context?: IFlagContext) => Variant;
     getStaticContext: () => IFlagContext;
+    impactMetrics?: IImpactMetricsResolver;
 }
 
 export interface IExternalFlagResolver {
     isEnabled: (flagName: IFlagKey, context?: IFlagContext) => boolean;
     getVariant: (flagName: IFlagKey, context?: IFlagContext) => Variant;
     getStaticContext: () => IFlagContext;
+    impactMetrics?: IImpactMetricsResolver;
+}
+
+export interface IImpactMetricsResolver {
+    defineCounter(name: string, help: string);
+    defineGauge(name: string, help: string);
+    incrementCounter(name: string, value?: number, featureName?: string): void;
+    updateGauge(name: string, value: number, featureName?: string): void;
 }
diff --git a/yarn.lock b/yarn.lock
index d006c4decf..8e8fef902f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -7706,9 +7706,9 @@ __metadata:
   languageName: node
   linkType: hard
 
-"unleash-client@npm:^6.6.0":
-  version: 6.6.0
-  resolution: "unleash-client@npm:6.6.0"
+"unleash-client@npm:^6.7.0-beta.0":
+  version: 6.7.0-beta.0
+  resolution: "unleash-client@npm:6.7.0-beta.0"
   dependencies:
     http-proxy-agent: "npm:^7.0.2"
     https-proxy-agent: "npm:^7.0.5"
@@ -7718,7 +7718,7 @@ __metadata:
     murmurhash3js: "npm:^3.0.1"
     proxy-from-env: "npm:^1.1.0"
     semver: "npm:^7.6.2"
-  checksum: 10c0/d97805744874a0dd66af7304142c40e0c5eea1958b4a3ebbeb29fdbc0d4a1e9d8bde2f713ffa972d825cd80f11958f19d5bcf97503857a2692c542755ede01ff
+  checksum: 10c0/881db461777fe6dd6e5bca8f209a3a69312b0010317051cfc9d2f996db87072957f7acbe9d5ad6fecb17e79d68f3d1b1e89b5d45c2bbc1fd3e9183d96d5737a8
   languageName: node
   linkType: hard
 
@@ -7836,7 +7836,7 @@ __metadata:
     type-is: "npm:^1.6.18"
     typescript: "npm:5.8.3"
     ulidx: "npm:^2.4.1"
-    unleash-client: "npm:^6.6.0"
+    unleash-client: "npm:^6.7.0-beta.0"
     uuid: "npm:^9.0.0"
     vite-node: "npm:^3.1.3"
     vitest: "npm:^3.1.3"