diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 375167d5..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
@@ -24,15 +27,10 @@ jobs:
         with:
           extra-conf: accept-flake-config = true
       - uses: DeterminateSystems/magic-nix-cache-action@v7
-      # TODO: improve with matrix
-      - name: Compile code ghc8107
-        run: nix build .#test-ghc8107
-      - name: Run tests ghc8107
-        run: nix run .#test-ghc8107
-      - name: Compile code ghc902
-        run: nix build .#test-ghc902
-      - name: Run tests ghc902
-        run: nix run .#test-ghc902
+      - 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 11004b68..062c8406 100644
--- a/flake.nix
+++ b/flake.nix
@@ -46,8 +46,7 @@
         };
         flake-ghc8107 = pkgs.hapistrano-ghc8107.flake { };
         flake-ghc902 = pkgs.hapistrano-ghc902.flake { };
-      in
-      flake-ghc8107 // flake-ghc902 // rec {
+      in rec {
         apps = {
           test-ghc8107 = {
             type = "app";
@@ -58,7 +57,6 @@
             program = "${packages.test-ghc902}/bin/test";
           };
         };
-        legacyPackages = pkgs;
         packages = {
           default = flake-ghc8107.packages."hapistrano:exe:hap";
           test-ghc8107 = flake-ghc8107.packages."hapistrano:test:test".overrideAttrs (_: {
@@ -86,5 +84,10 @@
             '';
           });
         };
+        devShells = {
+          default = devShells.ghc902;
+          ghc8107 = flake-ghc8107.devShells.default;
+          ghc902 = flake-ghc902.devShells.default;
+        };
       });
 }