diff --git a/.github/workflows/terraform-examples.yml b/.github/workflows/terraform-examples.yml
index 2a655de..25f812e 100644
--- a/.github/workflows/terraform-examples.yml
+++ b/.github/workflows/terraform-examples.yml
@@ -9,32 +9,44 @@ on:
 
 jobs:
 
-  check-terraform-fmt:
+  terraform-tflint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+      - name: Setup TFLint
+        uses: terraform-linters/setup-tflint@v6
+        with:
+          cache: true
+      - name: Show version
+        run: tflint --version
+      # - name: help
+      #   run: tflint -help
+      - name: Run
+        run: tflint --chdir=terraform --recursive
+
+  terraform-check-fmt:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
         uses: actions/checkout@v4
-
       - name: Install Terraform
         uses: hashicorp/setup-terraform@v2
-
       - name: Check Terraform formatting
         run: |
           bash terraform/repo-scripts/check-terraform-fmt.sh terraform
 
-  check-terraform-variables-tailscale-install-scripts:
+  terraform-check-variables-tailscale-install-scripts:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code
         uses: actions/checkout@v4
-
       # - name: tree
       #   working-directory: terraform
       #   run: |
       #     apt-get -y update
       #     apt-get -y install tree
       #     tree -a
-
       - name: Check variables-tailscale-install-scripts.tf files
         run: |
           bash terraform/repo-scripts/check-variables-tailscale-install-scripts.sh terraform
diff --git a/Makefile b/Makefile
index 6bde89d..5273da4 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,13 @@
 default: help
 
+.PHONY: terraform-tflint
+terraform-tflint: ## Run 'terraform-tflint' github actions with https://github.com/nektos/act
+	act -j terraform-tflint
+
 .PHONY: check-terraform-examples
-check-terraform-examples: ## Run specific 'check' github actions with https://github.com/nektos/act
-	act -j check-terraform-fmt
-	act -j check-variables-tailscale-install-scripts
+terraform-check-examples: ## Run specific 'check' github actions with https://github.com/nektos/act
+	act -j terraform-check-fmt
+	act -j terraform-check-variables-tailscale-install-scripts
 
 .PHONY: help
 help: ## Display this information. Default target.
diff --git a/terraform/.tflint.hcl b/terraform/.tflint.hcl
new file mode 100644
index 0000000..b8edc99
--- /dev/null
+++ b/terraform/.tflint.hcl
@@ -0,0 +1,4 @@
+plugin "terraform" {
+  enabled = true
+  preset  = "all"
+}
diff --git a/terraform/aws/aws-ec2-autoscaling-relay-to-private-subnet/versions.tf b/terraform/aws/aws-ec2-autoscaling-relay-to-private-subnet/versions.tf
index 8906343..70d492f 100644
--- a/terraform/aws/aws-ec2-autoscaling-relay-to-private-subnet/versions.tf
+++ b/terraform/aws/aws-ec2-autoscaling-relay-to-private-subnet/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 6.0, < 7.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/aws-ec2-autoscaling-session-recorder/versions.tf b/terraform/aws/aws-ec2-autoscaling-session-recorder/versions.tf
index 8906343..70d492f 100644
--- a/terraform/aws/aws-ec2-autoscaling-session-recorder/versions.tf
+++ b/terraform/aws/aws-ec2-autoscaling-session-recorder/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 6.0, < 7.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/aws-ec2-autoscaling/versions.tf b/terraform/aws/aws-ec2-autoscaling/versions.tf
index 8906343..70d492f 100644
--- a/terraform/aws/aws-ec2-autoscaling/versions.tf
+++ b/terraform/aws/aws-ec2-autoscaling/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 6.0, < 7.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/outputs.tf b/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/outputs.tf
index 8ed38ee..739e305 100644
--- a/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/outputs.tf
+++ b/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/outputs.tf
@@ -15,7 +15,7 @@ output "nat_public_ips" {
 }
 
 output "instance_ids" {
-  value = module.tailscale_aws_ec2.*.instance_id
+  value = module.tailscale_aws_ec2[*].instance_id
 }
 
 output "user_data_md5" {
diff --git a/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/versions.tf b/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/versions.tf
index 8906343..70d492f 100644
--- a/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/versions.tf
+++ b/terraform/aws/aws-ec2-instance-dual-stack-ipv4-ipv6/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 6.0, < 7.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/aws-ec2-instance/outputs.tf b/terraform/aws/aws-ec2-instance/outputs.tf
index 8ed38ee..739e305 100644
--- a/terraform/aws/aws-ec2-instance/outputs.tf
+++ b/terraform/aws/aws-ec2-instance/outputs.tf
@@ -15,7 +15,7 @@ output "nat_public_ips" {
 }
 
 output "instance_ids" {
-  value = module.tailscale_aws_ec2.*.instance_id
+  value = module.tailscale_aws_ec2[*].instance_id
 }
 
 output "user_data_md5" {
diff --git a/terraform/aws/aws-ec2-instance/versions.tf b/terraform/aws/aws-ec2-instance/versions.tf
index 8906343..70d492f 100644
--- a/terraform/aws/aws-ec2-instance/versions.tf
+++ b/terraform/aws/aws-ec2-instance/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 6.0, < 7.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/internal-modules/aws-ec2-autoscaling/versions.tf b/terraform/aws/internal-modules/aws-ec2-autoscaling/versions.tf
index 951051f..310c3f7 100644
--- a/terraform/aws/internal-modules/aws-ec2-autoscaling/versions.tf
+++ b/terraform/aws/internal-modules/aws-ec2-autoscaling/versions.tf
@@ -5,4 +5,6 @@ terraform {
       version = ">= 6.0, < 7.0"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/internal-modules/aws-ec2-instance/versions.tf b/terraform/aws/internal-modules/aws-ec2-instance/versions.tf
index 951051f..310c3f7 100644
--- a/terraform/aws/internal-modules/aws-ec2-instance/versions.tf
+++ b/terraform/aws/internal-modules/aws-ec2-instance/versions.tf
@@ -5,4 +5,6 @@ terraform {
       version = ">= 6.0, < 7.0"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/aws/internal-modules/aws-vpc/versions.tf b/terraform/aws/internal-modules/aws-vpc/versions.tf
index 951051f..32ccbe9 100644
--- a/terraform/aws/internal-modules/aws-vpc/versions.tf
+++ b/terraform/aws/internal-modules/aws-vpc/versions.tf
@@ -4,5 +4,11 @@ terraform {
       source  = "hashicorp/aws"
       version = ">= 6.0, < 7.0"
     }
+    random = {
+      source  = "hashicorp/random"
+      version = ">= 3.0, < 4.0"
+    }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/azure/azure-linux-vm/main.tf b/terraform/azure/azure-linux-vm/main.tf
index 45138cf..2c39950 100644
--- a/terraform/azure/azure-linux-vm/main.tf
+++ b/terraform/azure/azure-linux-vm/main.tf
@@ -27,7 +27,6 @@ locals {
   location            = azurerm_resource_group.main.location
 
   vpc_cidr_block            = module.vpc.vnet_address_space
-  vpc_id                    = module.vpc.vnet_id
   subnet_id                 = module.vpc.public_subnet_id
   network_security_group_id = azurerm_network_security_group.tailscale_ingress.id
   instance_type             = "Standard_D2as_v6"
diff --git a/terraform/azure/azure-linux-vm/versions.tf b/terraform/azure/azure-linux-vm/versions.tf
index 8906343..d5e75c5 100644
--- a/terraform/azure/azure-linux-vm/versions.tf
+++ b/terraform/azure/azure-linux-vm/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    azurerm = {
+      source  = "hashicorp/azurerm"
+      version = ">= 4.0, < 5.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/azure/internal-modules/azure-linux-vm/versions.tf b/terraform/azure/internal-modules/azure-linux-vm/versions.tf
index 7746b9c..6bfcb98 100644
--- a/terraform/azure/internal-modules/azure-linux-vm/versions.tf
+++ b/terraform/azure/internal-modules/azure-linux-vm/versions.tf
@@ -5,4 +5,6 @@ terraform {
       version = ">= 4.0, < 5.0"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/azure/internal-modules/azure-network/outputs.tf b/terraform/azure/internal-modules/azure-network/outputs.tf
index aad274a..36f9ef3 100644
--- a/terraform/azure/internal-modules/azure-network/outputs.tf
+++ b/terraform/azure/internal-modules/azure-network/outputs.tf
@@ -37,10 +37,10 @@ output "private_dns_resolver_inbound_endpoint_ip" {
 }
 
 output "nat_public_ips" {
-  value = azurerm_public_ip.nat.*.ip_address
+  value = azurerm_public_ip.nat[*].ip_address
 }
 
 output "nat_ids" {
   description = "Useful for using within `depends_on` for other resources"
-  value       = azurerm_nat_gateway.nat.*.id
+  value       = azurerm_nat_gateway.nat[*].id
 }
diff --git a/terraform/azure/internal-modules/azure-network/versions.tf b/terraform/azure/internal-modules/azure-network/versions.tf
index 7746b9c..963d0dd 100644
--- a/terraform/azure/internal-modules/azure-network/versions.tf
+++ b/terraform/azure/internal-modules/azure-network/versions.tf
@@ -4,5 +4,11 @@ terraform {
       source  = "hashicorp/azurerm"
       version = ">= 4.0, < 5.0"
     }
+    random = {
+      source  = "hashicorp/random"
+      version = ">= 3.0, < 4.0"
+    }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/google/google-compute-instance/versions.tf b/terraform/google/google-compute-instance/versions.tf
index 8906343..97df296 100644
--- a/terraform/google/google-compute-instance/versions.tf
+++ b/terraform/google/google-compute-instance/versions.tf
@@ -1,8 +1,14 @@
 terraform {
   required_providers {
+    google = {
+      source  = "hashicorp/google"
+      version = ">= 7.0, < 8.0"
+    }
     tailscale = {
       source  = "tailscale/tailscale"
       version = ">= 0.24"
     }
   }
+
+  required_version = ">= 1.0, < 2.0"
 }
diff --git a/terraform/google/internal-modules/google-compute-instance/main.tf b/terraform/google/internal-modules/google-compute-instance/main.tf
index 38baf4d..fb26d9f 100644
--- a/terraform/google/internal-modules/google-compute-instance/main.tf
+++ b/terraform/google/internal-modules/google-compute-instance/main.tf
@@ -9,10 +9,6 @@ module "tailscale_install_scripts" {
   additional_after_scripts  = var.additional_after_scripts
 }
 
-data "google_compute_subnetwork" "selected" {
-  self_link = "https://www.googleapis.com/compute/v1/${var.subnet}" # requires full URL - https://github.com/hashicorp/terraform-provider-google/issues/9919
-}
-
 data "google_compute_image" "ubuntu" {
   project = "ubuntu-os-cloud"
   family  = "ubuntu-2404-lts-amd64"
diff --git a/terraform/google/internal-modules/google-compute-instance/versions.tf b/terraform/google/internal-modules/google-compute-instance/versions.tf
index b3679ed..98cc894 100644
--- a/terraform/google/internal-modules/google-compute-instance/versions.tf
+++ b/terraform/google/internal-modules/google-compute-instance/versions.tf
@@ -5,5 +5,6 @@ terraform {
       version = ">= 7.0, < 8.0"
     }
   }
-}
 
+  required_version = ">= 1.0, < 2.0"
+}
diff --git a/terraform/google/internal-modules/google-vpc/versions.tf b/terraform/google/internal-modules/google-vpc/versions.tf
index b3679ed..3d6cd98 100644
--- a/terraform/google/internal-modules/google-vpc/versions.tf
+++ b/terraform/google/internal-modules/google-vpc/versions.tf
@@ -4,6 +4,11 @@ terraform {
       source  = "hashicorp/google"
       version = ">= 7.0, < 8.0"
     }
+    random = {
+      source  = "hashicorp/random"
+      version = ">= 3.0, < 4.0"
+    }
   }
-}
 
+  required_version = ">= 1.0, < 2.0"
+}
diff --git a/terraform/internal-modules/tailscale-advertise-routes/versions.tf b/terraform/internal-modules/tailscale-advertise-routes/versions.tf
new file mode 100644
index 0000000..f8f3ed3
--- /dev/null
+++ b/terraform/internal-modules/tailscale-advertise-routes/versions.tf
@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 1.0, < 2.0"
+}
diff --git a/terraform/internal-modules/tailscale-install-scripts/versions.tf b/terraform/internal-modules/tailscale-install-scripts/versions.tf
new file mode 100644
index 0000000..f8f3ed3
--- /dev/null
+++ b/terraform/internal-modules/tailscale-install-scripts/versions.tf
@@ -0,0 +1,3 @@
+terraform {
+  required_version = ">= 1.0, < 2.0"
+}