diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 239d75e..83b4b27 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,6 @@
 name: Build
 
-on: [push, pull_request]
+on: [push]
 
 jobs:
   build:
@@ -52,6 +52,15 @@ jobs:
     strategy:
       matrix:
         node-version: [7.x, 8.x, 9.x, 10.x, 11.x, 12.x, 13.x, 14.x, 15.x, 16.x, 17.x, 18.x, 19.x]
+        include:
+          - command: test
+          - command: test:use-openssl-ca
+            node-version: 7.x
+          - command: test:use-openssl-ca
+            node-version: 8.x
+          - command: test:use-openssl-ca
+            node-version: 9.x
+
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3
@@ -76,7 +85,7 @@ jobs:
         run: |
           cd smoke_tests/commonjs
           npm i
-          npm test
+          npm run ${{ matrix.command }}
 
   smoke-tests-esm:
     name: "Smoke tests (ESM)"
diff --git a/README.md b/README.md
index 40145ec..6838391 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,9 @@ more.
 ### Node.js
 
 - Supports Node.js 7.10.1 and newer.
-- Refer to [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/node/js_node_7_up) for help.
+- Refer to
+  [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/node/js_node_7_up)
+  for help.
 
 ```bash
 npm install serpapi
@@ -40,7 +42,9 @@ getJson({
 
 - If you prefer using the `import` syntax and top-level `await`, you need to use
   at least Node.js 14.8.0.
-- Refer to [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/node/js_node_14_up) for help.
+- Refer to
+  [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/node/js_node_14_up)
+  for help.
 
 You will need to add `"type": "module"` to your `package.json`:
 
@@ -66,7 +70,9 @@ console.log(response);
 
 - Import directly from deno.land.
 - Usage is otherwise the same as above.
-- Refer to [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/deno) for help.
+- Refer to
+  [this example](https://github.com/serpapi/serpapi-javascript/tree/master/examples/deno)
+  for help.
 
 ```ts
 import { getJson } from "https://deno.land/x/serpapi/mod.ts";
diff --git a/smoke_tests/commonjs/package.json b/smoke_tests/commonjs/package.json
index f229cf1..d1971c6 100644
--- a/smoke_tests/commonjs/package.json
+++ b/smoke_tests/commonjs/package.json
@@ -4,6 +4,7 @@
     "serpapi": "../../npm"
   },
   "scripts": {
-    "test": "node commonjs.js"
+    "test": "node commonjs.js",
+    "test:use-openssl-ca": "node --use-openssl-ca commonjs.js"
   }
 }
diff --git a/src/utils.ts b/src/utils.ts
index ef49a2a..a05fa05 100644
--- a/src/utils.ts
+++ b/src/utils.ts
@@ -63,6 +63,7 @@ export function execute(
   return new Promise((resolve, reject) => {
     let timer: number;
     const req = https.get(url, (resp) => {
+      resp.setEncoding("utf8");
       let data = "";
 
       // A chunk of data has been recieved.