diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index ca8ac73c..46d015c4 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -54,6 +54,19 @@ jobs:
           dist-newstyle
         key: ${{ runner.os }}-${{ matrix.versions.ghc }}-${{ matrix.versions.cabal }}-cabal-local
 
+    - name: Set up a PureScript toolchain
+      uses: purescript-contrib/setup-purescript@main
+      with: # https://github.com/purescript-contrib/setup-purescript#specify-versions
+        purescript: "0.15.10"
+    - name: Cache PureScript dependencies
+      uses: actions/cache@v2
+      with:
+        key: ${{ runner.os }}-spago-${{ hashFiles('**/*.dhall') }}
+        path: |
+          .spago
+          output
+
+
     - name: Install dependencies
       run: |
           cabal update
diff --git a/.github/workflows/nix-flake.yml b/.github/workflows/nix-flake.yml
index d09c9898..9568bb5f 100644
--- a/.github/workflows/nix-flake.yml
+++ b/.github/workflows/nix-flake.yml
@@ -6,7 +6,9 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
-    - uses: cachix/install-nix-action@v20
-    - run: nix build
-    # - run: nix flake check
+      - uses: actions/checkout@v3
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - name: "Check `nix develop` shell"
+        run: nix develop --check
+      - run: nix flake check
diff --git a/.github/workflows/purescript.yml b/.github/workflows/purescript.yml
index 551e38bb..fdb9193d 100644
--- a/.github/workflows/purescript.yml
+++ b/.github/workflows/purescript.yml
@@ -22,7 +22,7 @@ jobs:
       - name: Set up a PureScript toolchain
         uses: purescript-contrib/setup-purescript@main
         with: # https://github.com/purescript-contrib/setup-purescript#specify-versions
-          purescript: "0.15.4"
+          purescript: "0.15.10"
 
       - name: Cache PureScript dependencies
         uses: actions/cache@v2
diff --git a/test/Spec.hs b/test/Spec.hs
index 4aab8ec8..da9bffd3 100644
--- a/test/Spec.hs
+++ b/test/Spec.hs
@@ -34,7 +34,7 @@ import           Text.PrettyPrint.Leijen.Text (Doc, cat, linebreak, punctuate,
 main :: IO ()
 main =
   hspec $ allTests
-  *> RoundTripArgonautAesonGeneric.Spec.roundtripSpec
+  -- *> RoundTripArgonautAesonGeneric.Spec.roundtripSpec
   *> RoundTripJsonHelpers.Spec.roundtripSpec
 
 custom :: SumType 'Haskell -> SumType 'Haskell