diff --git a/Makefile b/Makefile
index aedc5b8..66df6f7 100644
--- a/Makefile
+++ b/Makefile
@@ -43,26 +43,4 @@ openapi:
 		--proto_path  ./protos \
 		--openapiv2_out ./gen/openapi2 \
 		--openapiv2_opt logtostderr=true \
-		/protos/echo/v1/echo.proto
-
-certs:
-	openssl genrsa -out ca.key 2048
-	openssl req -new -x509 -days 3650 \
-		-subj "/C=GB/L=China/O=gobook/CN=github.com" \
-		-key ca.key -out ca.crt
-	openssl req -new \
-		-subj "/C=GB/L=China/O=server/CN=server.io" \
-		-key server.key \
-		-out server.csr
-	openssl x509 -req -sha256 \
-		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
-		-in server.csr \
-		-out server.crt
-	openssl req -new \
-		-subj "/C=GB/L=China/O=client/CN=client.io" \
-		-key client.key \
-		-out client.csr
-	openssl x509 -req -sha256 \
-		-CA ca.crt -CAkey ca.key -CAcreateserial -days 3650 \
-		-in client.csr \
-		-out client.crt
\ No newline at end of file
+		/protos/echo/v1/echo.proto
\ No newline at end of file