diff --git a/Gopkg.lock b/Gopkg.lock
index ebdcb75a8..2edf1efc1 100644
--- a/Gopkg.lock
+++ b/Gopkg.lock
@@ -15,19 +15,36 @@
 
 [[projects]]
   name = "github.com/gogo/protobuf"
-  packages = ["gogoproto","proto","protoc-gen-gogo/descriptor"]
+  packages = [
+    "gogoproto",
+    "proto",
+    "protoc-gen-gogo/descriptor"
+  ]
   revision = "342cbe0a04158f6dcb03ca0079991a51a4248c02"
   version = "v0.5"
 
 [[projects]]
-  branch = "master"
   name = "github.com/golang/protobuf"
-  packages = ["jsonpb","proto","ptypes","ptypes/any","ptypes/duration","ptypes/struct","ptypes/timestamp"]
-  revision = "1e59b77b52bf8e4b449a57e6f79f21226d571845"
+  packages = [
+    "jsonpb",
+    "proto",
+    "ptypes",
+    "ptypes/any",
+    "ptypes/duration",
+    "ptypes/struct",
+    "ptypes/timestamp"
+  ]
+  revision = "aa810b61a9c79d51363740d207bb46cf8e620ed5"
+  version = "v1.2.0"
 
 [[projects]]
   name = "github.com/opentracing/opentracing-go"
-  packages = [".","ext","log","mocktracer"]
+  packages = [
+    ".",
+    "ext",
+    "log",
+    "mocktracer"
+  ]
   revision = "1949ddbfd147afd4d964a9f00b24eb291e0e7c38"
   version = "v1.0.2"
 
@@ -45,7 +62,11 @@
 
 [[projects]]
   name = "github.com/stretchr/testify"
-  packages = ["assert","require","suite"]
+  packages = [
+    "assert",
+    "require",
+    "suite"
+  ]
   revision = "69483b4bd14f5845b5a1e55bca19e954e827f1d0"
   version = "v1.1.4"
 
@@ -63,7 +84,14 @@
 
 [[projects]]
   name = "go.uber.org/zap"
-  packages = [".","buffer","internal/bufferpool","internal/color","internal/exit","zapcore"]
+  packages = [
+    ".",
+    "buffer",
+    "internal/bufferpool",
+    "internal/color",
+    "internal/exit",
+    "zapcore"
+  ]
   revision = "35aad584952c3e7020db7b839f6b102de6271f89"
   version = "v1.7.1"
 
@@ -76,30 +104,74 @@
 [[projects]]
   branch = "master"
   name = "golang.org/x/net"
-  packages = ["context","context/ctxhttp","http2","http2/hpack","idna","internal/timeseries","lex/httplex","trace"]
+  packages = [
+    "context",
+    "context/ctxhttp",
+    "http2",
+    "http2/hpack",
+    "idna",
+    "internal/timeseries",
+    "lex/httplex",
+    "trace"
+  ]
   revision = "a8b9294777976932365dabb6640cf1468d95c70f"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/oauth2"
-  packages = [".","google","internal","jws","jwt"]
+  packages = [
+    ".",
+    "google",
+    "internal",
+    "jws",
+    "jwt"
+  ]
   revision = "f95fa95eaa936d9d87489b15d1d18b97c1ba9c28"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/sys"
-  packages = ["unix","windows"]
+  packages = [
+    "unix",
+    "windows"
+  ]
   revision = "13fcbd661c8ececa8807a29b48407d674b1d8ed8"
 
 [[projects]]
   branch = "master"
   name = "golang.org/x/text"
-  packages = ["collate","collate/build","internal/colltab","internal/gen","internal/tag","internal/triegen","internal/ucd","language","secure/bidirule","transform","unicode/bidi","unicode/cldr","unicode/norm","unicode/rangetable"]
+  packages = [
+    "collate",
+    "collate/build",
+    "internal/colltab",
+    "internal/gen",
+    "internal/tag",
+    "internal/triegen",
+    "internal/ucd",
+    "language",
+    "secure/bidirule",
+    "transform",
+    "unicode/bidi",
+    "unicode/cldr",
+    "unicode/norm",
+    "unicode/rangetable"
+  ]
   revision = "75cc3cad82b5f47d3fb229ddda8c5167da14f294"
 
 [[projects]]
   name = "google.golang.org/appengine"
-  packages = [".","internal","internal/app_identity","internal/base","internal/datastore","internal/log","internal/modules","internal/remote_api","internal/urlfetch","urlfetch"]
+  packages = [
+    ".",
+    "internal",
+    "internal/app_identity",
+    "internal/base",
+    "internal/datastore",
+    "internal/log",
+    "internal/modules",
+    "internal/remote_api",
+    "internal/urlfetch",
+    "urlfetch"
+  ]
   revision = "150dc57a1b433e64154302bdc40b6bb8aefa313a"
   version = "v1.0.0"
 
@@ -111,13 +183,36 @@
 
 [[projects]]
   name = "google.golang.org/grpc"
-  packages = [".","balancer","balancer/roundrobin","codes","connectivity","credentials","credentials/oauth","encoding","grpclb/grpc_lb_v1/messages","grpclog","internal","keepalive","metadata","naming","peer","resolver","resolver/dns","resolver/passthrough","stats","status","tap","transport"]
+  packages = [
+    ".",
+    "balancer",
+    "balancer/roundrobin",
+    "codes",
+    "connectivity",
+    "credentials",
+    "credentials/oauth",
+    "encoding",
+    "grpclb/grpc_lb_v1/messages",
+    "grpclog",
+    "internal",
+    "keepalive",
+    "metadata",
+    "naming",
+    "peer",
+    "resolver",
+    "resolver/dns",
+    "resolver/passthrough",
+    "stats",
+    "status",
+    "tap",
+    "transport"
+  ]
   revision = "5a9f7b402fe85096d2e1d0383435ee1876e863d0"
   version = "v1.8.0"
 
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "b24c6670412eb0bc44ed1db77fecc52333f8725f3e3272bdc568f5683a63031f"
+  inputs-digest = "dce4b28e1721f4e888d4b5c9e1d87f672106941d8b09738ab53229a0c1cc9664"
   solver-name = "gps-cdcl"
   solver-version = 1
diff --git a/Gopkg.toml b/Gopkg.toml
index 0a7d4c1cd..eb2f385db 100644
--- a/Gopkg.toml
+++ b/Gopkg.toml
@@ -3,8 +3,8 @@
   version = "0.5.0"
 
 [[constraint]]
-  branch = "master"
   name = "github.com/golang/protobuf"
+  version = "1.2.0"
 
 [[constraint]]
   name = "github.com/opentracing/opentracing-go"