diff --git a/.drone.yml b/.drone.yml
index bb3ab4c6c..bac57bfac 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -118,7 +118,7 @@ pipeline:
     image: plugins/docker
     repo: drone/drone
     secrets: [ docker_username, docker_password ]
-    tag: [ 0.8, 0.8.3 ]
+    tag: [ 0.8, 0.8.4 ]
     when:
       event: tag
 
@@ -127,7 +127,7 @@ pipeline:
     repo: drone/agent
     dockerfile: Dockerfile.agent
     secrets: [ docker_username, docker_password ]
-    tag: [ 0.8, 0.8.3 ]
+    tag: [ 0.8, 0.8.4 ]
     when:
       event: tag
 
diff --git a/vendor/github.com/cncd/pipeline/pipeline/rpc/client_grpc.go b/vendor/github.com/cncd/pipeline/pipeline/rpc/client_grpc.go
index 204c4fdd0..991713321 100644
--- a/vendor/github.com/cncd/pipeline/pipeline/rpc/client_grpc.go
+++ b/vendor/github.com/cncd/pipeline/pipeline/rpc/client_grpc.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"encoding/json"
 	"time"
+	"log"
 
 	"github.com/cncd/pipeline/pipeline/backend"
 	"github.com/cncd/pipeline/pipeline/rpc/proto"
@@ -46,6 +47,8 @@ func (c *client) Next(ctx context.Context, f Filter) (*Pipeline, error) {
 		res, err = c.client.Next(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: done(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -84,6 +87,8 @@ func (c *client) Wait(ctx context.Context, id string) (err error) {
 		_, err = c.client.Wait(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: wait(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -116,6 +121,8 @@ func (c *client) Init(ctx context.Context, id string, state State) (err error) {
 		_, err = c.client.Init(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: init(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -148,6 +155,8 @@ func (c *client) Done(ctx context.Context, id string, state State) (err error) {
 		_, err = c.client.Done(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: done(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -173,6 +182,8 @@ func (c *client) Extend(ctx context.Context, id string) (err error) {
 		_, err = c.client.Extend(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: extend(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -205,6 +216,8 @@ func (c *client) Update(ctx context.Context, id string, state State) (err error)
 		_, err = c.client.Update(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: update(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -238,6 +251,8 @@ func (c *client) Upload(ctx context.Context, id string, file *File) (err error)
 		_, err = c.client.Upload(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: upload(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
@@ -268,6 +283,8 @@ func (c *client) Log(ctx context.Context, id string, line *Line) (err error) {
 		_, err = c.client.Log(ctx, req)
 		if err == nil {
 			break
+		} else {
+			log.Printf("grpc error: log(): code: %v: %s", grpc.Code(err), err)
 		}
 		switch grpc.Code(err) {
 		case
diff --git a/vendor/vendor.json b/vendor/vendor.json
index e450b6b95..363f0c1cc 100644
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@@ -195,80 +195,80 @@
 		{
 			"checksumSHA1": "W3AuK8ocqHwlUajGmQLFvnRhTZE=",
 			"path": "github.com/cncd/pipeline/pipeline",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "iRKdpheRPBTP0DKTQH7zmE2PI34=",
 			"path": "github.com/cncd/pipeline/pipeline/backend",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "EHJGG1USUliP8nzNWV/axO5KLzw=",
 			"path": "github.com/cncd/pipeline/pipeline/backend/docker",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "HWV2BBLXS4gY5eLJeNIg7Z6nAOA=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "ncGH2MfHDtM7/dNzj2i+lnXFnf4=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend/yaml",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "cdjOSSSS5Gzx7gRLNvObQvNJWYg=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend/yaml/compiler",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "Sj2VYU+asWToYriIqcinav5MJZo=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend/yaml/linter",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "kx2sPUIMozPC/g6E4w48h3FfH3k=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend/yaml/matrix",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "L7Q5qJmPITNmvFEEaj5MPwCWFRk=",
 			"path": "github.com/cncd/pipeline/pipeline/frontend/yaml/types",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "2/3f3oNmxXy5kcrRLCFa24Oc9O4=",
 			"path": "github.com/cncd/pipeline/pipeline/interrupt",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "uOjTfke7Qxosrivgz/nVTHeIP5g=",
 			"path": "github.com/cncd/pipeline/pipeline/multipart",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
-			"checksumSHA1": "5oiGroE8hLXcj9hcZ+GGoBEm3o0=",
+			"checksumSHA1": "mfWlnRAr5B4+RL13W3s0BQVBofM=",
 			"path": "github.com/cncd/pipeline/pipeline/rpc",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "N+3wNQ8hc/6yrh3FxbaxkEVwrkY=",
 			"path": "github.com/cncd/pipeline/pipeline/rpc/proto",
-			"revision": "f8c48fc9fb9fd113c6e7dd941d63bb9f86a623cb",
-			"revisionTime": "2017-12-01T21:30:15Z"
+			"revision": "3a09486affc9215ba52f55b1f6e10182458d1aba",
+			"revisionTime": "2018-01-10T21:28:38Z"
 		},
 		{
 			"checksumSHA1": "7Qj1DK0ceAXkYztW0l3+L6sn+V8=",
diff --git a/version/version.go b/version/version.go
index f329dab17..c59625381 100644
--- a/version/version.go
+++ b/version/version.go
@@ -8,7 +8,7 @@ var (
 	// VersionMinor is for functionality in a backwards-compatible manner.
 	VersionMinor int64 = 8
 	// VersionPatch is for backwards-compatible bug fixes.
-	VersionPatch int64 = 3
+	VersionPatch int64 = 4
 	// VersionPre indicates prerelease.
 	VersionPre string
 	// VersionDev indicates development branch. Releases will be empty string.