diff --git a/README.md b/README.md
index 5cc483d..2c29e70 100644
--- a/README.md
+++ b/README.md
@@ -127,7 +127,7 @@ Available targets:
 
 | Name | Version |
 |------|---------|
-| terraform | ~> 0.12.0 |
+| terraform | >= 0.12.0, < 0.14.0 |
 | aws | ~> 2.0 |
 | null | ~> 2.0 |
 | template | ~> 2.0 |
diff --git a/docs/terraform.md b/docs/terraform.md
index 28d99a7..88c9f64 100644
--- a/docs/terraform.md
+++ b/docs/terraform.md
@@ -2,7 +2,7 @@
 
 | Name | Version |
 |------|---------|
-| terraform | ~> 0.12.0 |
+| terraform | >= 0.12.0, < 0.14.0 |
 | aws | ~> 2.0 |
 | null | ~> 2.0 |
 | template | ~> 2.0 |
diff --git a/versions.tf b/versions.tf
index 484c1d6..298a3d1 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,5 +1,5 @@
 terraform {
-  required_version = "~> 0.12.0"
+  required_version = ">= 0.12.0, < 0.14.0"
 
   required_providers {
     aws      = "~> 2.0"