diff --git a/flake.lock b/flake.lock
index e63ddcf..eb49790 100644
--- a/flake.lock
+++ b/flake.lock
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1718983919,
-        "narHash": "sha256-+1xgeIow4gJeiwo4ETvMRvWoircnvb0JOt7NS9kUhoM=",
+        "lastModified": 1719900233,
+        "narHash": "sha256-n0r/+L73jFW4Y+sCUerulR7VcVADnfcXdzRs7PaiIqw=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "90338afd6177fc683a04d934199d693708c85a3b",
+        "rev": "0f56e3221392452f2c38e3ddf2eba03abda6bf47",
         "type": "github"
       },
       "original": {
diff --git a/main.tf b/main.tf
index 1d8ee3b..a3f3a72 100644
--- a/main.tf
+++ b/main.tf
@@ -48,7 +48,7 @@ locals {
   vpc_public = var.vpc_public
   vpc_zones  = var.vpc_zones
   availability_zones = (length(local.vpc_zones) > 0 ?
-    ({ for i in length(local.vpc_zones) : tostring(i) => local.vpc_zones[i] }) :
+    ({ for i in range(length(local.vpc_zones)) : tostring(i) => local.vpc_zones[i] }) :
     ({ "0" = data.aws_availability_zones.available.names[0] })
   )
   vpc_ipv4 = (local.vpc_mod > 0 ? module.vpc[0].ipv4 : null)