diff --git a/packages/networks/ergo-explorer/vitest.config.ts b/packages/networks/ergo-explorer/vitest.config.ts
index 1c63a83..ebc162a 100644
--- a/packages/networks/ergo-explorer/vitest.config.ts
+++ b/packages/networks/ergo-explorer/vitest.config.ts
@@ -13,6 +13,7 @@ export default defineConfig({
     },
     mockReset: true,
     watch: false,
+    threads: false,
   },
   plugins: [wasm(), topLevelAwait()],
 });
diff --git a/packages/networks/ergo-node/vitest.config.ts b/packages/networks/ergo-node/vitest.config.ts
index 1c63a83..ebc162a 100644
--- a/packages/networks/ergo-node/vitest.config.ts
+++ b/packages/networks/ergo-node/vitest.config.ts
@@ -13,6 +13,7 @@ export default defineConfig({
     },
     mockReset: true,
     watch: false,
+    threads: false,
   },
   plugins: [wasm(), topLevelAwait()],
 });