diff --git a/versions.tf b/versions.tf
index ac97c6a..4daaf74 100644
--- a/versions.tf
+++ b/versions.tf
@@ -1,4 +1,7 @@
 
 terraform {
   required_version = ">= 0.12"
+  required_providers {
+    aws = "= 2.21.0"
+  }
 }