diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
index d2cdff6..f55c8dc 100644
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -51,14 +51,17 @@ jobs:
     name: Minimum version check
     runs-on: ubuntu-latest
     container:
-      image: hashicorp/terraform:0.12.0
+      image: hashicorp/terraform:latest
     steps:
       - uses: actions/checkout@master
       - name: Validate Code
         env:
           AWS_REGION: 'us-east-1'
           TF_WARN_OUTPUT_ERRORS: 1
+          TF_VAR_vpc_id: 'vpc-123456'
+          TF_VAR_subnets: '["subnet-12345a"]'
+          TF_VAR_workers_ami_id: 'ami-123456'
+          TF_VAR_cluster_name: 'test_cluster'
         run: |
-          sed -i -e 's/>=/=/' -e 's/ \(\d\+\.\d\+\)"/ \1.0"/' versions.tf
           terraform init
-          terraform validate -var "region=${AWS_REGION}" -var "vpc_id=vpc-123456" -var "subnets=[\"subnet-12345a\"]" -var "workers_ami_id=ami-123456" -var "cluster_ingress_cidrs=[]" -var "cluster_name=test_cluster"
\ No newline at end of file
+          terraform validate
\ No newline at end of file
diff --git a/lambda-slack.tf b/lambda-slack.tf
index 2fc78b1..755f085 100644
--- a/lambda-slack.tf
+++ b/lambda-slack.tf
@@ -60,7 +60,7 @@ resource "random_string" "lambda_suffix" {
   length  = 8
   special = false
   lower   = true
-  number  = false
+  numeric = false
 }
 
 resource "aws_lambda_function" "default" {