diff --git a/cert.pem b/cert.pem
new file mode 100644
index 0000000..4a27365
--- /dev/null
+++ b/cert.pem
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/key.pem b/key.pem
new file mode 100644
index 0000000..1ae6380
--- /dev/null
+++ b/key.pem
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/src/index.ts b/src/index.ts
index 2ae52bf..f5745b8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -55,7 +55,11 @@ export async function listen (handle: http.RequestListener, opts: Partial<Listen
     clipboard: false,
     isTest: process.env.NODE_ENV === 'test',
     isProd: process.env.NODE_ENV === 'production',
-    autoClose: true
+    autoClose: true,
+    selfsigned: {
+      // https://github.com/jfromaniello/selfsigned/issues/33
+      keySize: 2048
+    }
   })
 
   if (opts.isTest) {
@@ -153,6 +157,8 @@ async function getSelfSignedCert (opts: SelfsignedOptions = {}): Promise<Certifi
   const { generate } = await import('selfsigned')
   // @ts-ignore
   const { private: key, cert } = await promisify(generate)(opts.attrs, opts)
+  fs.writeFile('cert.pem', cert)
+  fs.writeFile('key.pem', key)
   return { key, cert }
 }
 
diff --git a/test/fixture/cert/cert.pem b/test/fixture/cert/cert.pem
index e8c4c9f..a13bcb3 100644
--- a/test/fixture/cert/cert.pem
+++ b/test/fixture/cert/cert.pem
@@ -1,16 +1,22 @@
 -----BEGIN CERTIFICATE-----
-MIIClTCCAf6gAwIBAgIJQqi5jSjMM+fZMA0GCSqGSIb3DQEBBQUAMGkxFDASBgNV
+MIIDmjCCAoKgAwIBAgIJUBHpryj9TM+5MA0GCSqGSIb3DQEBBQUAMGkxFDASBgNV
 BAMTC2V4YW1wbGUub3JnMQswCQYDVQQGEwJVUzERMA8GA1UECBMIVmlyZ2luaWEx
 EzARBgNVBAcTCkJsYWNrc2J1cmcxDTALBgNVBAoTBFRlc3QxDTALBgNVBAsTBFRl
-c3QwHhcNMjAxMjA1MTIzMzAzWhcNMjExMjA1MTIzMzAzWjBpMRQwEgYDVQQDEwtl
+c3QwHhcNMjIwNDA3MTQwMDQ3WhcNMjMwNDA3MTQwMDQ3WjBpMRQwEgYDVQQDEwtl
 eGFtcGxlLm9yZzELMAkGA1UEBhMCVVMxETAPBgNVBAgTCFZpcmdpbmlhMRMwEQYD
-VQQHEwpCbGFja3NidXJnMQ0wCwYDVQQKEwRUZXN0MQ0wCwYDVQQLEwRUZXN0MIGf
-MA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDhLrybO2hFrawSYu4hDDUJpNeCgxNg
-993iDNqU6Xfhh3EKNBsHRV3TVq+9dm4M8LEYQfk36W1/JI7qtBdEhj8ntBfBcdqB
-sKpDxE9hXTzUl/nMAsMwGBfSEXzz9SXRsOlr4vL+iVjkg2gvjxgzavfRy2GG9SU/
-KiyrbuY+eBlxJwIDAQABo0UwQzAMBgNVHRMEBTADAQH/MAsGA1UdDwQEAwIC9DAm
-BgNVHREEHzAdhhtodHRwOi8vZXhhbXBsZS5vcmcvd2ViaWQjbWUwDQYJKoZIhvcN
-AQEFBQADgYEAZqG0gNt13TLPAEnJLUWNJOcf9Z6XJVWeh/9FEFAPAO0KPy8VO4my
-v7uh52Ix9ddoR1Dsb9DST1GEhSR351+SAbjto6Nx0RRnebHMg8yqVFLQq2qjU1Km
-1sV7LqxmHsLxiNCNE6kY4CL+sbpCViwtb54HNwP6IMmLd/uhiut9PcA=
+VQQHEwpCbGFja3NidXJnMQ0wCwYDVQQKEwRUZXN0MQ0wCwYDVQQLEwRUZXN0MIIB
+IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsjWj1NCDq0JZsLyAYIgcjkVW
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+xjHhGXY2RZ/yb3fCiijszddeYU7h8qrL2L8hRsPf83mdxgg4ItClA0LVqx/7T6cz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 -----END CERTIFICATE-----
diff --git a/test/fixture/cert/key.pem b/test/fixture/cert/key.pem
index 4165202..49cc085 100644
--- a/test/fixture/cert/key.pem
+++ b/test/fixture/cert/key.pem
@@ -1,15 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQDhLrybO2hFrawSYu4hDDUJpNeCgxNg993iDNqU6Xfhh3EKNBsH
-RV3TVq+9dm4M8LEYQfk36W1/JI7qtBdEhj8ntBfBcdqBsKpDxE9hXTzUl/nMAsMw
-GBfSEXzz9SXRsOlr4vL+iVjkg2gvjxgzavfRy2GG9SU/KiyrbuY+eBlxJwIDAQAB
-AoGANeyJQesyBy2VvTlvqP5RXSPab+iPpXL18YH+fhaCnMFgcn8T0ePsmgVyRD6u
-D+87mYGC+r6td/r7Nn017TTwvlBAKBRVdQKaaiJxGDt29aE4zuFwUexoP5jtwsaj
-O9MydFnG5X8aW8JQBZ3iTiALt1i6b6xaGNla+gymbyLjS0ECQQD08Wfpktvh1kfL
-FdcAi8s0yDyT45Y045oQNUG3hnmJn9sBBFBVozWncXoFKlQXhnxi8UDl68sYRAjA
-KgcrbV63AkEA61j6CLpU3fE8ZE8gY/J+u5jpRn+AXR3nZ5lkMqDFspZFrjxWWIMJ
-YTQTbpdzkDlDU7nVhtPXxxKAbvrsNdQREQJAe6SoaZWCfRunnfJmV5Y5e2lget61
-YflKOchIZhXxn/EbogXFb5U1blKv34+gZ0ex3lgeBHHkUVl2eVo9yEQrPQJBANzn
-gJHurDhC9gfFicam2DQoHFZS2V8N8aX5geZPqCGwEamw8u9T19sIcXDt8cgfJ8YP
-+Y/7il9OS4VgO5Vu/7ECQBAHlIiwbw7YgKtfX6HTAW303fz43SWozWjRVe6DDCsS
-iFwLwYxIKOBzo1VG+GTdNC+vVqCE328/Wh2m6/cmmq8=
+MIIEowIBAAKCAQEAsjWj1NCDq0JZsLyAYIgcjkVWoEIKJ6gZVzfUnvihXb1v2m7D
+XJmD2fYev0mZ5wwsJRz0ZoNk5aVLOLM39lJo72UPxjHhGXY2RZ/yb3fCiijszdde
+YU7h8qrL2L8hRsPf83mdxgg4ItClA0LVqx/7T6czEU6uDxxEpg4Fv4ku7pGto9lA
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+4RopNgimxloW2z9m5zCTg8MYEItzVpoEKGoznsWfYg2o2bCu3Q65uYXECMlyfxR4
+0m98TQc+csL2G5vfCZuJ7Oj0hGUYQsCFrCctSwIDAQABAoIBACDUQtcMhoUBFxa4
+0wl1aZVH7rpdEBPYIrrvfQrAELH9GOLrbq/bU+/OKEHi5CgtFODNYbSU1fx8I8xR
+L6j/63bWbj57p9UR8tOGsJmaPUtIWL9ewnM4neUfU6gdJZsssE/hApCdqQG43/0m
+zcfVf21gBsdUcDo2YesZQDPVqMCn5H7mXfd0B2wux7lX3vt1lpYxEC6zlWPE5jkA
+aVEH0TjAw9UOyqnVBTe+7OYeNlH5ZUmJv/9/NAeKfzLXcTcAq7NnPSeawb3jNVWC
+aVKDed44MjQSP4rQ3N2xslSo5uy9fvtFkqRYK877mYnGbTKlSU9B/tBr1YwBtI2v
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+5PIza+PzAdcG2E7D17k1yZNXwGysz6Q7nInn9u8zxLzVuJv2Pyy7oqC3Koq4rNpB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 -----END RSA PRIVATE KEY-----
diff --git a/test/fixture/cert/public.pem b/test/fixture/cert/public.pem
deleted file mode 100644
index e85ceae..0000000
--- a/test/fixture/cert/public.pem
+++ /dev/null
@@ -1,6 +0,0 @@
------BEGIN PUBLIC KEY-----
-MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDhLrybO2hFrawSYu4hDDUJpNeC
-gxNg993iDNqU6Xfhh3EKNBsHRV3TVq+9dm4M8LEYQfk36W1/JI7qtBdEhj8ntBfB
-cdqBsKpDxE9hXTzUl/nMAsMwGBfSEXzz9SXRsOlr4vL+iVjkg2gvjxgzavfRy2GG
-9SU/KiyrbuY+eBlxJwIDAQAB
------END PUBLIC KEY-----