diff --git a/external/versions.tf b/external/versions.tf
index 4e46789a..5ced7810 100644
--- a/external/versions.tf
+++ b/external/versions.tf
@@ -1,5 +1,5 @@
 terraform {
-  required_version = "~> 1.5.0"
+  required_version = "~> 1.6.0"
 
   backend "remote" {
     hostname     = "app.terraform.io"
diff --git a/flake.lock b/flake.lock
index 55f037c8..d562aee4 100644
--- a/flake.lock
+++ b/flake.lock
@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1694529238,
-        "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=",
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "ff7b65b44d01cf9ba6a71320833626af21126384",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
         "type": "github"
       },
       "original": {
@@ -20,16 +20,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1698288402,
-        "narHash": "sha256-jIIjApPdm+4yt8PglX8pUOexAdEiAax/DXW3S/Mb21E=",
+        "lastModified": 1704295289,
+        "narHash": "sha256-9WZDRfpMqCYL6g/HNWVvXF0hxdaAgwgIGeLYiOhmes8=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "60b9db998f71ea49e1a9c41824d09aa274be1344",
+        "rev": "b0b2c5445c64191fd8d0b31f2b1a34e45a64547d",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-23.05",
+        "ref": "nixos-23.11",
         "repo": "nixpkgs",
         "type": "github"
       }
diff --git a/flake.nix b/flake.nix
index 7765e049..ebcbc4c8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -2,14 +2,19 @@
   description = "Homelab";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.11";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachDefaultSystem (system:
       let
-        pkgs = nixpkgs.legacyPackages.${system};
+        # TODO remove unfree after removing Terraform
+        # (Source: https://xeiaso.net/blog/notes/nix-flakes-terraform-unfree-fix)
+        pkgs = import nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+        };
       in
       with pkgs;
       {
diff --git a/test/go.mod b/test/go.mod
index daf8ce9d..59a32d81 100644
--- a/test/go.mod
+++ b/test/go.mod
@@ -1,6 +1,8 @@
 module git.khuedoan.com/ops/homelab
 
-go 1.20
+go 1.21
+
+toolchain go1.21.4
 
 require github.com/gruntwork-io/terratest v0.46.1
 
diff --git a/test/go.sum b/test/go.sum
index da43b857..e8b74487 100644
--- a/test/go.sum
+++ b/test/go.sum
@@ -116,6 +116,7 @@ cloud.google.com/go/language v1.6.0/go.mod h1:6dJ8t3B+lUYfStgls25GusK04NLh3eDLQn
 cloud.google.com/go/lifesciences v0.5.0/go.mod h1:3oIKy8ycWGPUyZDR/8RNnTOYevhaMLqh5vLUXs9zvT8=
 cloud.google.com/go/lifesciences v0.6.0/go.mod h1:ddj6tSX/7BOnhxCSd3ZcETvtNr8NZ6t/iPhY2Tyfu08=
 cloud.google.com/go/longrunning v0.3.0 h1:NjljC+FYPV3uh5/OwWT6pVU+doBqMg2x/rZlE+CamDs=
+cloud.google.com/go/longrunning v0.3.0/go.mod h1:qth9Y41RRSUE69rDcOn6DdK3HfQfsUI0YSmW3iIlLJc=
 cloud.google.com/go/mediatranslation v0.5.0/go.mod h1:jGPUhGTybqsPQn91pNXw0xVHfuJ3leR1wj37oU3y1f4=
 cloud.google.com/go/mediatranslation v0.6.0/go.mod h1:hHdBCTYNigsBxshbznuIMFNe5QXEowAuNmmC7h8pu5w=
 cloud.google.com/go/memcache v1.4.0/go.mod h1:rTOfiGZtJX1AaFUrOgsMHX5kAzaTQ8azHiuDoTPzNsE=
@@ -197,6 +198,7 @@ github.com/apparentlymart/go-textseg v1.0.0/go.mod h1:z96Txxhf3xSFMPmb5X/1W05FF/
 github.com/apparentlymart/go-textseg/v13 v13.0.0 h1:Y+KvPE1NYz0xl601PVImeQfFyEy6iT90AvPUL1NNfNw=
 github.com/apparentlymart/go-textseg/v13 v13.0.0/go.mod h1:ZK2fH7c4NqDTLtiYLvIkEghdlcqw7yxLeM89kiTRPUo=
 github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5 h1:0CwZNZbxp69SHPdPJAN/hZIm0C4OItdklCFmMRWYpio=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
 github.com/aws/aws-sdk-go v1.44.122 h1:p6mw01WBaNpbdP2xrisz5tIkcNwzj/HysobNoaAHjgo=
 github.com/aws/aws-sdk-go v1.44.122/go.mod h1:y4AeaBuwd2Lk+GepC1E9v0qOiTws0MIWAX4oIKwKHZo=
 github.com/bgentry/go-netrc v0.0.0-20140422174119-9fd32a8b3d3d h1:xDfNPAt8lFiC1UJrqV3uuy861HCTo708pDMbjHHdCas=
@@ -262,6 +264,7 @@ github.com/go-openapi/swag v0.22.3/go.mod h1:UzaqsxGiab7freDnrUUra0MwWfN/q7tE4j+
 github.com/go-sql-driver/mysql v1.4.1 h1:g24URVg0OFbNUTx9qqY1IRZ9D9z3iPyi5zKhQZpNwpA=
 github.com/go-sql-driver/mysql v1.4.1/go.mod h1:zAC/RDZ24gD3HViQzih4MyKcchzm+sOG5ZlKdlhCg5w=
 github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0 h1:p104kn46Q8WdvHunIJ9dAyjPVtrBPhSr3KT2yUst43I=
+github.com/go-task/slim-sprig v0.0.0-20210107165309-348f09dbbbc0/go.mod h1:fyg7847qk6SyHyPtNmDHnmrv/HOrqktSC+C9fM+CJOE=
 github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/go-test/deep v1.0.7 h1:/VSMRlnY/JSyqxQUzQLKVMAskpY/NZKFA5j2P+0pP2M=
 github.com/go-test/deep v1.0.7/go.mod h1:QV8Hv/iy04NyLBxAdO9njL0iVPN1S4d/A3NVv1V36o8=
@@ -417,6 +420,7 @@ github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORN
 github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
 github.com/kr/pretty v0.3.0 h1:WgNl7dwNpEZ6jJ9k1snq4pZsg7DOEN8hP9Xw0Tsjwk0=
+github.com/kr/pretty v0.3.0/go.mod h1:640gp4NfQd8pI5XOwp5fnNeVWj67G7CFk/SaSQn7NBk=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
@@ -454,7 +458,9 @@ github.com/modern-go/reflect2 v1.0.2/go.mod h1:yWuevngMOJpCy52FWWMvUC8ws7m/LJsjY
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
 github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/onsi/ginkgo/v2 v2.9.1 h1:zie5Ly042PD3bsCvsSOPvRnFwyo3rKe64TJlD6nu0mk=
+github.com/onsi/ginkgo/v2 v2.9.1/go.mod h1:FEcmzVcCHl+4o9bQZVab+4dC9+j+91t2FHSzmGAPfuo=
 github.com/onsi/gomega v1.27.4 h1:Z2AnStgsdSayCMDiCU42qIz+HLqEPcgiOCXjAU/w+8E=
+github.com/onsi/gomega v1.27.4/go.mod h1:riYq/GJKh8hhoM01HN6Vmuy93AarCXCBGpvFDK3q3fQ=
 github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -464,6 +470,7 @@ github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
+github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
 github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
@@ -802,6 +809,7 @@ golang.org/x/tools v0.1.4/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
 golang.org/x/tools v0.7.0 h1:W4OVu8VVOaIO0yzWMNdepAulS7YfoS3Zabrm8DOXXU4=
+golang.org/x/tools v0.7.0/go.mod h1:4pg6aUX35JBAogB10C9AtvVL+qowtN4pT3CGSQex14s=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
diff --git a/test/tools_test.go b/test/tools_test.go
index 0087d878..a3284183 100644
--- a/test/tools_test.go
+++ b/test/tools_test.go
@@ -17,14 +17,14 @@ func TestToolsVersions(t *testing.T) {
 		versionConstraint string
 	}{
 		{"ansible", "--version", ">= 2.12.6, < 3.0.0"},
-		{"docker", "--version", ">= 20.10.17, < 21.0.0"},
+		{"docker", "--version", ">= 24.0.0, < 25.0.0"},
 		{"git", "--version", ">= 2.37.1, < 3.0.0"},
-		{"go", "version", ">= 1.20.0, < 1.21.0"},
+		{"go", "version", ">= 1.21.0, < 1.22.0"},
 		{"helm", "version", ">= 3.9.4, < 4.0.0"},
 		{"kubectl", "version", ">= 1.27.0, < 1.29.0"}, // https://kubernetes.io/releases/version-skew-policy/#kubectl
 		{"kustomize", "version", ">= 5.0.3, < 6.0.0"},
 		{"pre-commit", "--version", ">= 3.3.2, < 4.0.0"},
-		{"terraform", "--version", ">= 1.5.0, < 1.6.0"},
+		{"terraform", "--version", ">= 1.6.0, < 1.7.0"},
 	}
 
 	for _, tool := range tools {