diff --git a/install.sh b/install.sh
index bdcf3af007eda..0cd1344413dcd 100755
--- a/install.sh
+++ b/install.sh
@@ -224,7 +224,7 @@ EOF
 }
 
 main() {
-	TERRAFORM_VERSION="1.3.4"
+	TERRAFORM_VERSION="1.6.6"
 
 	if [ "${TRACE-}" ]; then
 		set -x
diff --git a/provisioner/terraform/install.go b/provisioner/terraform/install.go
index 24e40014191ad..e50c3d9af99ab 100644
--- a/provisioner/terraform/install.go
+++ b/provisioner/terraform/install.go
@@ -19,6 +19,7 @@ var (
 	// TerraformVersion is the version of Terraform used internally
 	// when Terraform is not available on the system.
 	// NOTE: Keep this in sync with the version in scripts/Dockerfile.base.
+	// NOTE: Keep this in sync with the version in install.sh.
 	TerraformVersion = version.Must(version.NewVersion("1.6.6"))
 
 	minTerraformVersion = version.Must(version.NewVersion("1.1.0"))