diff --git a/build/docker/ca.crt b/build/docker/ca.crt
index 1e5787f..f6cc712 100644
--- a/build/docker/ca.crt
+++ b/build/docker/ca.crt
@@ -1,19 +1,17 @@
 -----BEGIN CERTIFICATE-----
-MIIDITCCAgmgAwIBAgIJALwezbB84FA9MA0GCSqGSIb3DQEBCwUAMCYxJDAiBgNV
-BAMMG0FkbWlzc2lvbiBXZWJob29rIFNlcnZlciBDQTAgFw0xOTA1MTQxNjUxMjZa
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 -----END CERTIFICATE-----
diff --git a/build/docker/tls.crt b/build/docker/tls.crt
index 302e2ee..fde4a70 100644
--- a/build/docker/tls.crt
+++ b/build/docker/tls.crt
@@ -1,18 +1,20 @@
 -----BEGIN CERTIFICATE-----
-MIIC0jCCAboCCQD8dzANQe5A8jANBgkqhkiG9w0BAQsFADAmMSQwIgYDVQQDDBtB
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-1YVM04+/
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+EN4/olD6tqJLkxOHfTCVN0ic07Hh6wSLUY1sEHuPFVO9RKU62XvTJ2KyHID27w==
 -----END CERTIFICATE-----
diff --git a/build/docker/tls.key b/build/docker/tls.key
index 6a77937..40da214 100644
--- a/build/docker/tls.key
+++ b/build/docker/tls.key
@@ -1,27 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-MIIEogIBAAKCAQEAzJrg0l0KWpT9CELiSjKdqDETRlqecoG4O5v3Zxq+sB+Z2hpI
-gIsJL23HngUjllyMrZXrDdyZwugsPKuO2U7oPH187J3OyLU9P8gcKrkSMhzVMS9K
-WXg/BSHaINIWzwI6+Bqzodz7NmyL43Z6CGSCNq90uTU9u31J+9c13q8beXav4mBI
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-1z5Zb3G34Uwua20lSpPh1EJWjioAx8S4T4VvJbQ9o25bSYktn2NsnN5X1/Wrbmec
-jlabjRKxPvQA1HzgYTnnkSKaC1fAPEII7OBJIwIDAQABAoIBAG+gU+YRIrP2svHN
-472NTdxUIerxR567TPMgjWKwAbb/FqYaTtHqiPFaWFzK+vZuucV+lEX0w+LFXlUf
-WAkQ9r0BzaUeF5IC506j81IPtHCosFtsLIkRhHhdVq8vT4hS9C8mCjjV4ix4Hf3U
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-LLPVRCalNLe1LdO+2jTw97rOKguXEhDqWIpUra15EnBiTWXholLHvpTkF8U5gI4X
-DaoL9wVuuk6TaaWxrk9zzEVVeTYcfqQrCkv4R6KTD7JzbI0ipijD+jjkGyWVvVEE
-HLe16GECgYEA/jqsgoJyYwFu5YvaYyzp+Ou/zwHFt+ItNRwVF7Nu5MZIgh5ZltRP
-s98rpRUu9Q3uPzHYe6EA7NGUoOb91Scl4orheK7Cj/HjjLZfzBsolP3FYE0T7ySa
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-q9+KD5EccmobKG4X9s08JTvfk2TXP9Xa0YQJRnIoJcLB0FR3LoFrn8xem2tAK84y
-1QfXtilTIndN6du67SvlWbK6sHv5qJaZQXS9TUazYBhjBudFbng0G7VcIL/PGHvH
-IqkJY/rr5Y5bRNoSTtcqYO6AgIJt569qZKe7cvMCgYATYlvm85VPMTvIatpy92i7
-nxYX7ZWqyKcTxplhHkBVVz0OFsxT8MpG97w3MR9Mdgx1axKLkqIkbHJ9tj8icoKz
-/Ezmy8Rv/0yPXRR+1o9IlPTou9fKQysv12HZkumhTI91X9wAs36G0ZSBs1m4l2Zn
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+oi5LeV3jDi6/qVszXbyEoRiWP1k9pAQJZJ6cED9QcvtMuUVc+m2071UcXZ52I+wN
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+EFpdBQKBgGmV/X7pLS244Hmbt4HXLIzAE5CQg5IIdUKT+v0Ih3Hz3Ku1VlIZYnZ5
+5NdULo5O79CkOBug5sSpd+AI8Q36qvzmLArcooFhmhpS/aCr8oZceJrcmb2Q8W2U
+fYM9Mj+KNIR883dk20/y2S96OpqmT4FVp7TH+S0qwKHbJsZZDmIi
 -----END RSA PRIVATE KEY-----
diff --git a/hack/gencerts.sh b/hack/gencerts.sh
index f5f9b6a..103aee7 100755
--- a/hack/gencerts.sh
+++ b/hack/gencerts.sh
@@ -36,10 +36,31 @@ mkdir -p $key_dir
 chmod 0700 $key_dir
 cd $key_dir
 
+SANCNF=san.cnf
+
+cat << EOF > ${SANCNF}
+[req]
+distinguished_name = req_distinguished_name
+req_extensions = v3_req
+prompt = no
+
+[req_distinguished_name]
+C = CN
+O = tkestack
+CN = cron-hpa-controller.kube-system.svc
+
+[v3_req]
+keyUsage = critical, digitalSignature, keyEncipherment
+extendedKeyUsage = clientAuth, serverAuth
+subjectAltName = @alt_names
+[alt_names]
+DNS.1=cron-hpa-controller.kube-system.svc
+EOF
+
 # Generate the CA cert and private key
 openssl req -nodes -new -x509 -days 100000 -keyout ca.key -out ca.crt -subj "/CN=Admission Webhook Server CA"
 # Generate the private key for the webhook server
 openssl genrsa -out tls.key 2048
 # Generate a Certificate Signing Request (CSR) for the private key, and sign it with the private key of the CA.
-openssl req -new -days 100000 -key tls.key -subj "/CN=cron-hpa-controller.kube-system.svc" \
-    | openssl x509 -req -days 100000 -CA ca.crt -CAkey ca.key -CAcreateserial -out tls.crt
+openssl req -new -sha256 -days 100000 -key tls.key -subj "/cron-hpa-controller.kube-system.svc" -reqexts v3_req -config ${SANCNF} \
+  | openssl x509 -req -days 100000 -CA ca.crt -CAkey ca.key -CAcreateserial -extensions v3_req  -extfile ${SANCNF}  -out tls.crt