diff --git a/.circleci/config.yml b/.circleci/config.yml
index 71d7d58..cce1484 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,7 +2,7 @@ version: 2.1
 executors:
   node14:
     docker:
-      - image: cimg/node:14.20
+      - image: cimg/node:14.21
 
 orbs:
   codecov: codecov/codecov@3.2.4
diff --git a/package.json b/package.json
index 93a8af4..fab93ba 100644
--- a/package.json
+++ b/package.json
@@ -73,7 +73,6 @@
     "nock": "13.2.9",
     "nyc": "15.1.0",
     "parse-cache-control": "1.0.1",
-    "pem": "1.14.6",
     "semantic-release": "19.0.5",
     "sinon": "14.0.1",
     "stream-buffers": "3.0.2"
diff --git a/test/keys.json b/test/keys.json
new file mode 100644
index 0000000..732d767
--- /dev/null
+++ b/test/keys.json
@@ -0,0 +1 @@
+{"cert":"-----BEGIN CERTIFICATE-----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\nksdvxCLDEGU=\n-----END CERTIFICATE-----","key":"-----BEGIN RSA PRIVATE KEY-----\nMIIEpAIBAAKCAQEA5iloL4f1iNjxC+I1F8G2u+1II+b4fL0bwKnDJNGyiRJ516m7\nbMqdNtVGXyrXVQDaL3Ce9VMDd36jc4wn2ot/OTzP20tuFJ8tnt/qDb6kBNx5l+Oo\n1DtAHBWJVxphZ/Kxnbc0AosS7m6H/CCtDZjjvzk381oTi/hN8C5Hk9eQbJ/agYH0\nQGT5V1ZG6LXnbkZso2kRsN+1q85lBFpyuvbl/DlLOI6lRHV+VCcNzAH5YxaZQTpz\nltLgvX5r1ne7/KT09ZgwcI1Wwx5sZCi0hZuKcKCfpRZayaZy+FPrIeev/u/rA6oi\ncsq7Q4xzggTIJqrJpBlJtvNV3lFcdPoXhEiYpQIDAQABAoIBABysyfsqADA1fwqQ\n+zZjfwW40UUP0KOR1/RP8i0TJyAmuiFhVyV9tMqRFbxjlQJVIdnJOTStTABGOcz6\niDiVKpuR9P+ITUWqcz+Y/AsMVlj4svl2dqFCZIFbOYotkjcmKHTSz1sFwq0L/ksu\nMwE/rBg147+g2FCW9fbXfTlxIOA3abwzMIY5mZZfh0pyZr/L/vqfwJYcNgkmsf/N\nTQd3rZf6iXST7SrG3vUW791JiZsRd+6ANQTt8ih+m4bq/JrOOLb5aXoeBrGhlHMB\nK7bHfMak675TpYgKF6v1I6n5SauX4WjqISubtPUjue3dg5WFvStgLtUbvCdVjaBW\nowsgut0CgYEA+LCGYjYaMCLWKyg5X+FpE/wSMjjoBI4g12T4sPSpIN3fJZudOVQB\nYgHHPAkk6lWD1+7eCaf5C95ICPWrfJZC0vgK/zg40LHdEGxFY62UM1o6Du9VWHGk\naG24Jk/LlSwZxCbcAEeJqmJRm2369CmAEJ3uZJRLoe3DJoGXJKeNOvMCgYEA7O10\nMgX2I0i4Pc1p5kMxOTfa9TtuO/fv3F3YDvFEXLD802aokIGuV5Swnk2m8kBtEYZH\nG8vUj7lYT1QZbFX1qk8A5z2tAjzD4XPW8KdEllKz3tWw1dT2exktkt8Pavdommfv\nNWWTQbOm6rcHzrBnXqkBeISt3wxgB0zkXQArFAcCgYEAg3Q79JoIib1AXButCEOM\nWaX6sFVoP1Aph/G1i0QoSlk9ZRG2r+D5wiaSe+eRfdSqFnALKiuB94YNqb7CYN7E\nf+PhXDsJvTbnVZEFtMTB+8sLuW1FPbUEZLbqikXPpRBkpkysKfGmkUvbOz+NUZbG\nPQJeSwggWn3lk+sYS6XNf4UCgYEAz9NOfF6sVLECI/wea4P/FpC/OSPDg0juFuAe\nmKTb8W6yp4FCVVfbpSlhb8rvqUoIIjol/+Tg9J2BMDy1/Ei+sICSa0S3kOHadNXW\n8cvXpwCulMXfUwJ2nu4sAsw1Sv/wuph2xODvtc8vmG2qpIwqcGdRSfUgSyogxeaV\n3lo6b1sCgYBX2hZjtyfKvXq/ApT78oXnrb19wuB2ZMRheK/SKVHygwqOUeRXH6Ig\nXdLQO4LpbjCRHHhYi4ElA0mPfgZyC6dVrH7wRf5fVXHlATXtgeCpmU7ep0WLWsFH\nhLMGFH75fuatF2ctW6eimP07SvUohrVYuNIsHiAuHQ+0/rz9dMygfg==\n-----END RSA PRIVATE KEY-----"}
\ No newline at end of file
diff --git a/test/server.js b/test/server.js
index 5041dca..756e74e 100644
--- a/test/server.js
+++ b/test/server.js
@@ -12,14 +12,10 @@
 
 'use strict';
 
+const { readFile } = require('fs').promises;
 const http = require('http');
 const https = require('https');
 const http2 = require('http2');
-const util = require('util');
-
-const pem = require('pem');
-
-const createCertificate = util.promisify(pem.createCertificate);
 
 const WOKEUP = 'woke up!';
 const sleep = (ms) => new Promise((resolve) => {
@@ -78,11 +74,8 @@ class Server {
       const createServer = async (handler) => {
         let options = {};
         if (this.secure) {
-          const keys = await createCertificate({ selfSigned: true });
-          options = {
-            key: keys.serviceKey,
-            cert: keys.certificate,
-          };
+          const keys = JSON.parse(await readFile(`${__dirname}/keys.json`));
+          options = { ...keys };
         }
         // merge with user-provided options
         options = { ...options, ...this.options };