diff --git a/lib/openssl.c b/lib/openssl.c
index 0150ca2..7f5105d 100644
--- a/lib/openssl.c
+++ b/lib/openssl.c
@@ -1218,6 +1218,7 @@
 static int verify_cert_chain(X509_STORE *store, X509 *cert, STACK_OF(X509) * chain, int is_server, const char *server_name)
 {
     X509_STORE_CTX *verify_ctx;
+    X509_VERIFY_PARAM *params;
     int ret;
 
     assert(server_name != NULL && "ptls_set_server_name MUST be called");
@@ -1227,11 +1228,27 @@
         ret = PTLS_ERROR_NO_MEMORY;
         goto Exit;
     }
+    if ((params = X509_VERIFY_PARAM_new()) == NULL) {
+        ret = PTLS_ERROR_NO_MEMORY;
+        goto Exit;
+    }
     if (X509_STORE_CTX_init(verify_ctx, store, cert, chain) != 1) {
         ret = PTLS_ERROR_LIBRARY;
         goto Exit;
     }
-    X509_STORE_CTX_set_purpose(verify_ctx, is_server ? X509_PURPOSE_SSL_SERVER : X509_PURPOSE_SSL_CLIENT);
+
+    X509_VERIFY_PARAM_set_purpose(params, is_server ? X509_PURPOSE_SSL_SERVER : X509_PURPOSE_SSL_CLIENT);
+    X509_VERIFY_PARAM_set_depth(params, 2);
+
+    if (server_name != NULL) {
+        if (ptls_server_name_is_ipaddr(server_name)) 
+            X509_VERIFY_PARAM_set1_host(params, server_name, 0);
+        else                                        
+            X509_VERIFY_PARAM_set1_ip_asc(params, server_name);
+    }
+
+    X509_STORE_CTX_set0_param(verify_ctx, params);
+
     if (X509_verify_cert(verify_ctx) != 1) {
         int x509_err = X509_STORE_CTX_get_error(verify_ctx);
         switch (x509_err) {
@@ -1252,6 +1269,7 @@
             ret = PTLS_ALERT_UNKNOWN_CA;
             break;
         case X509_V_ERR_INVALID_CA:
+
             ret = PTLS_ALERT_BAD_CERTIFICATE;
             break;
         default:
@@ -1261,32 +1279,13 @@
         goto Exit;
     }
 
-#ifdef X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS
-    /* verify CN */
-    if (server_name != NULL) {
-        if (ptls_server_name_is_ipaddr(server_name)) {
-            ret = X509_check_ip_asc(cert, server_name, 0);
-        } else {
-            ret = X509_check_host(cert, server_name, strlen(server_name), X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS, NULL);
-        }
-        if (ret != 1) {
-            if (ret == 0) { /* failed match */
-                ret = PTLS_ALERT_BAD_CERTIFICATE;
-            } else {
-                ret = PTLS_ERROR_LIBRARY;
-            }
-            goto Exit;
-        }
-    }
-#else
-#warning "hostname validation is disabled; OpenSSL >= 1.0.2 or LibreSSL >= 2.5.0 is required"
-#endif
-
     ret = 0;
 
 Exit:
+    // X509_VERIFY_PARAM *params is freed by the store
     if (verify_ctx != NULL)
         X509_STORE_CTX_free(verify_ctx);
+
     return ret;
 }
 
@@ -1302,6 +1301,8 @@
 
     assert(num_certs != 0);
 
+    printf("verify_cert -> check point 1\n");
+
     /* convert certificates to OpenSSL representation */
     if ((cert = to_x509(certs[0])) == NULL) {
         ret = PTLS_ALERT_BAD_CERTIFICATE;
@@ -1316,10 +1317,14 @@
         sk_X509_push(chain, interm);
     }
 
+    printf("verify_cert -> check point 2\n");
+
     /* verify the chain */
     if ((ret = verify_cert_chain(self->cert_store, cert, chain, ptls_is_server(tls), ptls_get_server_name(tls))) != 0)
         goto Exit;
 
+    printf("verify_cert -> check point 3\n");
+
     /* extract public key for verifying the TLS handshake signature */
     if ((*verify_data = X509_get_pubkey(cert)) == NULL) {
         ret = PTLS_ALERT_BAD_CERTIFICATE;