diff --git a/vendor/github.com/hashicorp/vault-plugin-auth-gcp/plugin/cli.go b/vendor/github.com/hashicorp/vault-plugin-auth-gcp/plugin/cli.go
index dc17f54cc..fb3b71f2e 100644
--- a/vendor/github.com/hashicorp/vault-plugin-auth-gcp/plugin/cli.go
+++ b/vendor/github.com/hashicorp/vault-plugin-auth-gcp/plugin/cli.go
@@ -8,9 +8,9 @@ import (
 	"github.com/hashicorp/go-cleanhttp"
 	"github.com/hashicorp/go-gcp-common/gcputil"
 	"github.com/hashicorp/vault/api"
+	"github.com/hashicorp/vault/helper/parseutil"
 	"golang.org/x/oauth2"
 	"google.golang.org/api/iam/v1"
-	"strconv"
 	"strings"
 	"time"
 )
@@ -44,15 +44,14 @@ func getSignedJwt(role string, m map[string]string) (string, error) {
 		}
 	}
 
-	var ttlMin = int64(defaultIamMaxJwtExpMinutes)
+	var ttl = time.Duration(defaultIamMaxJwtExpMinutes) * time.Minute
 	jwtExpStr, ok := m["jwt_exp"]
 	if ok {
-		ttlMin, err = strconv.ParseInt(jwtExpStr, 10, 64)
+		ttl, err = parseutil.ParseDurationSecond(jwtExpStr)
 		if err != nil {
 			return "", fmt.Errorf("could not parse jwt_exp '%s' into integer value", jwtExpStr)
 		}
 	}
-	ttl := time.Minute * time.Duration(ttlMin)
 
 	jwtPayload := map[string]interface{}{
 		"aud": fmt.Sprintf("http://vault/%s", role),
diff --git a/vendor/vendor.json b/vendor/vendor.json
index 62eb137da..af9d782f1 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -1309,10 +1309,10 @@
 			"revisionTime": "2018-06-06T02:20:31Z"
 		},
 		{
-			"checksumSHA1": "SMQTceFhHRKV9aFfpy7YUdL/BSY=",
+			"checksumSHA1": "SjXo3W6G8ippBVEZpYe63C2/KJo=",
 			"path": "github.com/hashicorp/vault-plugin-auth-gcp/plugin",
-			"revision": "88de4611ed29dc576719b15cae2c943e6ecc992f",
-			"revisionTime": "2018-07-10T20:29:00Z"
+			"revision": "ce466e5ee54ee8b93ab3b15ac5b7df564f3412dc",
+			"revisionTime": "2018-08-03T20:34:32Z"
 		},
 		{
 			"checksumSHA1": "en64nC2RYQjJuHMcWMqwmDBU9bc=",