diff --git a/go.mod b/go.mod
index 5d5f6a9ac..dbb131f75 100644
--- a/go.mod
+++ b/go.mod
@@ -128,7 +128,7 @@ 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 v0.0.0-20190130221141-d7fe3fa0020f
+	github.com/zclconf/go-cty v0.0.0-20190201220620-4ca19710f056
 	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 c53c528da..6e8e0a9f1 100644
--- a/go.sum
+++ b/go.sum
@@ -325,8 +325,8 @@ github.com/xlab/treeprint v0.0.0-20161029104018-1d6e34225557/go.mod h1:ce1O1j6Ut
 github.com/zclconf/go-cty v0.0.0-20181129180422-88fbe721e0f8/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
 github.com/zclconf/go-cty v0.0.0-20190124225737-a385d646c1e9 h1:hHCAGde+QfwbqXSAqOmBd4NlOrJ6nmjWp+Nu408ezD4=
 github.com/zclconf/go-cty v0.0.0-20190124225737-a385d646c1e9/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
-github.com/zclconf/go-cty v0.0.0-20190130221141-d7fe3fa0020f h1:QdzpIo5V8FV8SHsXCXpgSXOquZEF7YozbNcYnEnGZvA=
-github.com/zclconf/go-cty v0.0.0-20190130221141-d7fe3fa0020f/go.mod h1:xnAOWiHeOqg2nWS62VtQ7pbOu17FtxJNW8RLEih+O3s=
+github.com/zclconf/go-cty v0.0.0-20190201220620-4ca19710f056 h1:C6LhH3JHz2k6tnw5sYXBc8rD8SD/qFp6EhiZAcVyalk=
+github.com/zclconf/go-cty v0.0.0-20190201220620-4ca19710f056/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/github.com/zclconf/go-cty/cty/type_conform.go b/vendor/github.com/zclconf/go-cty/cty/type_conform.go
index b417dc79b..476eeea87 100644
--- a/vendor/github.com/zclconf/go-cty/cty/type_conform.go
+++ b/vendor/github.com/zclconf/go-cty/cty/type_conform.go
@@ -50,23 +50,20 @@ func testConformance(given Type, want Type, path Path, errs *[]error) {
 		givenAttrs := given.AttributeTypes()
 		wantAttrs := want.AttributeTypes()
 
-		if len(givenAttrs) != len(wantAttrs) {
-			// Something is missing from one of them.
-			for k := range givenAttrs {
-				if _, exists := wantAttrs[k]; !exists {
-					*errs = append(
-						*errs,
-						errorf(path, "unsupported attribute %q", k),
-					)
-				}
+		for k := range givenAttrs {
+			if _, exists := wantAttrs[k]; !exists {
+				*errs = append(
+					*errs,
+					errorf(path, "unsupported attribute %q", k),
+				)
 			}
-			for k := range wantAttrs {
-				if _, exists := givenAttrs[k]; !exists {
-					*errs = append(
-						*errs,
-						errorf(path, "missing required attribute %q", k),
-					)
-				}
+		}
+		for k := range wantAttrs {
+			if _, exists := givenAttrs[k]; !exists {
+				*errs = append(
+					*errs,
+					errorf(path, "missing required attribute %q", k),
+				)
 			}
 		}
 
diff --git a/vendor/modules.txt b/vendor/modules.txt
index 836b04dca..37bd969dc 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 v0.0.0-20190130221141-d7fe3fa0020f
+# github.com/zclconf/go-cty v0.0.0-20190201220620-4ca19710f056
 github.com/zclconf/go-cty/cty
 github.com/zclconf/go-cty/cty/gocty
 github.com/zclconf/go-cty/cty/convert