diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 60a31f04..712a27c3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -15,6 +15,9 @@ jobs:
           - macos-13      # x86_64-darwin
           - macos-latest  # aarch64-darwin
           - ubuntu-latest # x86_64-linux
+        ghc:
+          - ghc8107
+          - ghc902
       fail-fast: true
     runs-on: ${{ matrix.os }}
     timeout-minutes: 15
@@ -24,10 +27,10 @@ jobs:
         with:
           extra-conf: accept-flake-config = true
       - uses: DeterminateSystems/magic-nix-cache-action@v7
-      - name: Compile code
-        run: nix build .#test
-      - name: Run tests
-        run: nix run .#test
+      - name: Compile code ${{ matrix.ghc }}
+        run: nix build .#test-${{ matrix.ghc }}
+      - name: Run tests ${{ matrix.ghc }}
+        run: nix run .#test-${{ matrix.ghc }}
 
   docker:
     uses: ./.github/workflows/reusable-docker.yml
diff --git a/flake.nix b/flake.nix
index 99e590ba..062c8406 100644
--- a/flake.nix
+++ b/flake.nix
@@ -7,8 +7,14 @@
 
   nixConfig = {
     allow-import-from-derivation = "true";
-    extra-substituters = [ "https://cache.iog.io" ];
-    extra-trusted-public-keys = [ "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=" ];
+    extra-substituters = [
+      "https://cache.iog.io"
+      "https://cache.zw3rk.com"
+    ];
+    extra-trusted-public-keys = [
+      "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
+      "loony-tools:pr9m4BkM/5/eSTZlkQyRt57Jz7OMBxNSUiMC4FkcNfk="
+    ];
   };
 
   outputs = inputs@{ self, flake-utils, haskellNix, nixpkgs }:
@@ -21,29 +27,39 @@
           overlays = [
             haskellNix.overlay
             (final: prev: {
-              hapistrano = final.haskell-nix.cabalProject' {
+              hapistrano-ghc8107 = final.haskell-nix.cabalProject' {
                 src = final.haskell-nix.haskellLib.cleanGit {
                   name = "hapistrano";
                   src = ./.;
                 };
                 compiler-nix-name = "ghc8107";
               };
+              hapistrano-ghc902 = final.haskell-nix.cabalProject' {
+                src = final.haskell-nix.haskellLib.cleanGit {
+                  name = "hapistrano";
+                  src = ./.;
+                };
+                compiler-nix-name = "ghc902";
+              };
             })
           ];
         };
-        flake = pkgs.hapistrano.flake { };
-      in
-      flake // rec {
+        flake-ghc8107 = pkgs.hapistrano-ghc8107.flake { };
+        flake-ghc902 = pkgs.hapistrano-ghc902.flake { };
+      in rec {
         apps = {
-          test = {
+          test-ghc8107 = {
             type = "app";
-            program = "${packages.test}/bin/test";
+            program = "${packages.test-ghc8107}/bin/test";
+          };
+          test-ghc902 = {
+            type = "app";
+            program = "${packages.test-ghc902}/bin/test";
           };
         };
-        legacyPackages = pkgs;
         packages = {
-          default = flake.packages."hapistrano:exe:hap";
-          test = flake.packages."hapistrano:test:test".overrideAttrs (_: {
+          default = flake-ghc8107.packages."hapistrano:exe:hap";
+          test-ghc8107 = flake-ghc8107.packages."hapistrano:test:test".overrideAttrs (_: {
             postFixup = ''
               wrapProgram $out/bin/test \
                 --set PATH ${pkgs.lib.makeBinPath [
@@ -55,8 +71,23 @@
                 ]}
             '';
           });
+          test-ghc902 = flake-ghc902.packages."hapistrano:test:test".overrideAttrs (_: {
+            postFixup = ''
+              wrapProgram $out/bin/test \
+                --set PATH ${pkgs.lib.makeBinPath [
+                  pkgs.bash
+                  pkgs.coreutils
+                  pkgs.findutils
+                  pkgs.git
+                  pkgs.zsh
+                ]}
+            '';
+          });
+        };
+        devShells = {
+          default = devShells.ghc902;
+          ghc8107 = flake-ghc8107.devShells.default;
+          ghc902 = flake-ghc902.devShells.default;
         };
       });
 }
-
-