diff --git a/go.mod b/go.mod
index 2b2fbd6..5a6fb25 100644
--- a/go.mod
+++ b/go.mod
@@ -4,5 +4,5 @@ go 1.16
 
 require (
 	github.com/stretchr/testify v1.7.0
-	github.com/zclconf/go-cty v1.8.4
+	github.com/zclconf/go-cty v1.9.0
 )
diff --git a/go.sum b/go.sum
index 73a8634..c900914 100644
--- a/go.sum
+++ b/go.sum
@@ -18,8 +18,8 @@ github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5Cc
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/vmihailenco/msgpack/v4 v4.3.12/go.mod h1:gborTTJjAo/GWTqqRjrLCn9pgNN+NXzzngzBKDPIqw4=
 github.com/vmihailenco/tagparser v0.1.1/go.mod h1:OeAg3pn3UbLjkWt+rN9oFYB6u/cQgqMEUPoW2WPyhdI=
-github.com/zclconf/go-cty v1.8.4 h1:pwhhz5P+Fjxse7S7UriBrMu6AUJSZM5pKqGem1PjGAs=
-github.com/zclconf/go-cty v1.8.4/go.mod h1:vVKLxnk3puL4qRAv72AO+W99LUD4da90g3uUAzyuvAk=
+github.com/zclconf/go-cty v1.9.0 h1:IgJxw5b4LPXCPeqFjjhLaNEA8NKXMyaEUdAd399acts=
+github.com/zclconf/go-cty v1.9.0/go.mod h1:vVKLxnk3puL4qRAv72AO+W99LUD4da90g3uUAzyuvAk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
 golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=