diff --git a/go.mod b/go.mod
index 4420a21b6b..20d7bab2e3 100644
--- a/go.mod
+++ b/go.mod
@@ -129,7 +129,7 @@ require (
 	github.com/xanzy/ssh-agent v0.2.0
 	github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18 // indirect
 	github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557
-	github.com/zclconf/go-cty v0.0.0-20181218225846-4fe1e489ee06
+	github.com/zclconf/go-cty v0.0.0-20181231001355-67e3da15e430
 	go.opencensus.io v0.17.0 // indirect
 	go.uber.org/atomic v1.3.2 // indirect
 	go.uber.org/multierr v1.1.0 // indirect
diff --git a/go.sum b/go.sum
index 5cfa0c56cd..7cfcf56c79 100644
--- a/go.sum
+++ b/go.sum
@@ -323,8 +323,8 @@ github.com/xiang90/probing v0.0.0-20160813154853-07dd2e8dfe18/go.mod h1:UETIi67q
 github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557 h1:Jpn2j6wHkC9wJv5iMfJhKqrZJx3TahFx+7sbZ7zQdxs=
 github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557/go.mod h1:ce1O1j6UtZfjr22oyGxGLbauSBp2YVXpARAosm7dHBg=
 github.com/zclconf/go-cty v0.0.0-20181129180422-88fbe721e0f8/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
-github.com/zclconf/go-cty v0.0.0-20181218225846-4fe1e489ee06 h1:J3bfEicd/d85VHC6bPhrKb+2jO+Uquiy2bnkhia6XBA=
-github.com/zclconf/go-cty v0.0.0-20181218225846-4fe1e489ee06/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
+github.com/zclconf/go-cty v0.0.0-20181231001355-67e3da15e430 h1:dVON7OSpamimAzArYpi0Zl/iuvrhGqPnP/OO+XHXofY=
+github.com/zclconf/go-cty v0.0.0-20181231001355-67e3da15e430/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
 go.opencensus.io v0.17.0 h1:2Cu88MYg+1LU+WVD+NWwYhyP0kKgRlN9QjWGaX0jKTE=
 go.opencensus.io v0.17.0/go.mod h1:mp1VrMQxhlqqDpKvH4UcQUa4YwlzNmymAjPrDdfxNpI=
 go.uber.org/atomic v1.3.2 h1:2Oa65PReHzfn29GpvgsYwloV9AVFHPDk8tYxt2c2tr4=
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 6b6d4df154..3246f949d9 100644
--- a/vendor/modules.txt
+++ b/vendor/modules.txt
@@ -482,7 +482,7 @@ github.com/vmihailenco/msgpack/codes
 github.com/xanzy/ssh-agent
 # github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557
 github.com/xlab/treeprint
-# github.com/zclconf/go-cty v0.0.0-20181218225846-4fe1e489ee06
+# github.com/zclconf/go-cty v0.0.0-20181231001355-67e3da15e430
 github.com/zclconf/go-cty/cty
 github.com/zclconf/go-cty/cty/gocty
 github.com/zclconf/go-cty/cty/convert