diff --git a/src/gateway/server-methods/agents.ts b/src/gateway/server-methods/agents.ts
index 9678338db0d..88e362a36d4 100644
--- a/src/gateway/server-methods/agents.ts
+++ b/src/gateway/server-methods/agents.ts
@@ -365,7 +365,11 @@ function resolveOptionalStringParam(value: unknown): string | undefined {
   return typeof value === "string" && value.trim() ? value.trim() : undefined;
 }
 
-function respondInvalidMethodParams(respond: RespondFn, method: string, errors: unknown): void {
+function respondInvalidMethodParams(
+  respond: RespondFn,
+  method: string,
+  errors: Parameters<typeof formatValidationErrors>[0],
+): void {
   respond(
     false,
     undefined,
diff --git a/src/infra/update-startup.test.ts b/src/infra/update-startup.test.ts
index 468c6574982..77ccdc6dd20 100644
--- a/src/infra/update-startup.test.ts
+++ b/src/infra/update-startup.test.ts
@@ -182,7 +182,9 @@ describe("update-startup", () => {
   }
 
   async function runStableUpdateCheck(params: {
-    onUpdateAvailableChange?: ReturnType<typeof vi.fn>;
+    onUpdateAvailableChange?: Parameters<
+      typeof runGatewayUpdateCheck
+    >[0]["onUpdateAvailableChange"];
   }) {
     await runGatewayUpdateCheck({
       cfg: { update: { channel: "stable" } },