diff --git a/README.md b/README.md
index 43002e40..f4a69c71 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ These features of S3 bucket configurations are supported:
 
 ## Terraform versions
 
-Only Terraform 0.12 is supported.
+Terraform 0.12 and above are supported.
 
 ## Usage
 
@@ -84,7 +84,7 @@ module "s3_bucket" {
 
 | Name | Version |
 |------|---------|
-| terraform | ~> 0.12.6 |
+| terraform | >= 0.12.6, < 0.14 |
 | aws | ~> 2.35 |
 
 ## Providers
diff --git a/versions.tf b/versions.tf
index ac4ff303..bb20137f 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,5 +1,5 @@
 terraform {
-  required_version = "~> 0.12.6"
+  required_version = ">= 0.12.6, < 0.14"
 
   required_providers {
     aws = "~> 2.35"