diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6955d7b..1e3080a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,10 +10,10 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v4.2.1
-    - name: Install Nix
-      uses: NixOS/nix-installer-action@main
+    - name: Install Lix
+      uses: samueldr/lix-gha-installer-action@latest
       with:
-        extra-conf: 'accept-flake-config = true
+        extra_nix_config: 'accept-flake-config = true
 
           max-jobs = auto
 
@@ -32,7 +32,7 @@ jobs:
       uses: cachix/cachix-action@master
       with:
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        installCommand: nix profile add github:NixOS/nixpkgs/nixpkgs-unstable#cachix
+        installCommand: nix profile install github:NixOS/nixpkgs/nixpkgs-unstable#cachix
         name: e10
     - run: 'nix build .#nixosConfigurations.${{ matrix.host }}.config.system.build.toplevel
         --accept-flake-config --show-trace
@@ -54,10 +54,10 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v4.2.1
-    - name: Install Nix
-      uses: NixOS/nix-installer-action@main
+    - name: Install Lix
+      uses: samueldr/lix-gha-installer-action@latest
       with:
-        extra-conf: 'accept-flake-config = true
+        extra_nix_config: 'accept-flake-config = true
 
           max-jobs = auto
 
@@ -76,7 +76,7 @@ jobs:
       uses: cachix/cachix-action@master
       with:
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        installCommand: nix profile add github:NixOS/nixpkgs/nixpkgs-unstable#cachix
+        installCommand: nix profile install github:NixOS/nixpkgs/nixpkgs-unstable#cachix
         name: e10
     - name: Clean up storage
       run: 'sudo rm -rf /usr/share/dotnet /usr/local/lib/android /opt/ghc /opt/hostedtoolcache/CodeQL
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 160c5c5..e499c0f 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -5,10 +5,10 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v4.2.1
-    - name: Install Nix
-      uses: NixOS/nix-installer-action@main
+    - name: Install Lix
+      uses: samueldr/lix-gha-installer-action@latest
       with:
-        extra-conf: 'accept-flake-config = true
+        extra_nix_config: 'accept-flake-config = true
 
           max-jobs = auto
 
@@ -27,7 +27,7 @@ jobs:
       uses: cachix/cachix-action@master
       with:
         authToken: ${{ secrets.CACHIX_AUTH_TOKEN }}
-        installCommand: nix profile add github:NixOS/nixpkgs/nixpkgs-unstable#cachix
+        installCommand: nix profile install github:NixOS/nixpkgs/nixpkgs-unstable#cachix
         name: e10
     - run: 'nix flake check --impure --accept-flake-config --show-trace
 
diff --git a/flake.nix b/flake.nix
index d2216e6..60f61f4 100644
--- a/flake.nix
+++ b/flake.nix
@@ -96,7 +96,10 @@
               [ "dotnet-sdk-6.0.428" "aspnetcore-runtime-6.0.36" ];
           };
 
-          overlays = [ self.overlays.default ];
+          overlays = [
+            self.overlays.default
+            (_final: prev: { inherit (prev.lixPackageSets.stable) colmena; })
+          ];
         };
       };
     };
diff --git a/modules/development/ci.nix b/modules/development/ci.nix
index af809bf..b9da8a1 100644
--- a/modules/development/ci.nix
+++ b/modules/development/ci.nix
@@ -9,10 +9,10 @@ in {
           uses = "actions/checkout@v4.2.1";
         }
         {
-          name = "Install Nix";
-          uses = "NixOS/nix-installer-action@main";
+          name = "Install Lix";
+          uses = "samueldr/lix-gha-installer-action@latest";
           "with" = {
-            extra-conf = ''
+            extra_nix_config = ''
               accept-flake-config = true
               max-jobs = auto
             '';
@@ -39,7 +39,7 @@ in {
             authToken = "\${{ secrets.CACHIX_AUTH_TOKEN }}";
             name = "e10";
             installCommand =
-              "nix profile add github:NixOS/nixpkgs/nixpkgs-unstable#cachix";
+              "nix profile install github:NixOS/nixpkgs/nixpkgs-unstable#cachix";
           };
         }
       ];
diff --git a/modules/profiles/core/nix-config.nix b/modules/profiles/core/nix-config.nix
index d862c0a..18229fc 100644
--- a/modules/profiles/core/nix-config.nix
+++ b/modules/profiles/core/nix-config.nix
@@ -1,14 +1,18 @@
-{ flake, lib, ... }: {
+{ flake, pkgs, lib, ... }: {
   nixpkgs = {
     config = {
       allowUnfree = true;
       permittedInsecurePackages =
         [ "dotnet-sdk-6.0.428" "aspnetcore-runtime-6.0.36" ];
     };
-    overlays = [ flake.overlays.default ];
+    overlays = [
+      flake.overlays.default
+      (_final: prev: { inherit (prev.lixPackageSets.stable) colmena; })
+    ];
   };
 
   nix = {
+    package = pkgs.lixPackageSets.stable.lix;
     optimise.automatic = true;
     gc = {
       automatic = lib.mkDefault true;