diff --git a/.github/workflows/sandwich-hedgehog.yml b/.github/workflows/sandwich-hedgehog.yml
index 443d8e3f..d8ee76ae 100644
--- a/.github/workflows/sandwich-hedgehog.yml
+++ b/.github/workflows/sandwich-hedgehog.yml
@@ -73,37 +73,42 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc:
-        - "8.6.5"
-        - "8.8.4"
-        - "8.10.7"
-        - "9.0.2"
-        - "9.2.7"
-        - "9.4.5"
+        include:
+        - ghc: "8.6.5"
+          resolver: "lts-14.27"
+        - ghc: "8.8.4"
+          resolver: "lts-16.31"
+        - ghc: "8.10.7"
+          resolver: "lts-18.28"
+        - ghc: "9.0.2"
+          resolver: "lts-19.33"
+        - ghc: "9.2.8"
+          resolver: "lts-20.26"
+        - ghc: "9.4.5"
+          resolver: "lts-21.0"
 
     steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
+    - uses: actions/checkout@v3
 
     - uses: haskell/actions/setup@v2
       name: Setup Haskell Stack
       with:
         ghc-version: ${{ matrix.ghc }}
-        stack-version: "2.9.3"
         enable-stack: true
+        stack-version: "latest"
 
     - uses: actions/cache@v1
       name: Cache ~/.stack
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
+        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ matrix.resolver }}-stack
 
     - name: Build
       run: |
         cd sandwich-hedgehog
-        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
+        stack build --resolver ${{matrix.resolver}} --system-ghc --test --bench --no-run-tests --no-run-benchmarks
 
     - name: Test
       run: |
         cd sandwich-hedgehog
-        stack test --system-ghc
+        stack test --resolver ${{matrix.resolver}} --system-ghc
diff --git a/.github/workflows/sandwich-quickcheck.yml b/.github/workflows/sandwich-quickcheck.yml
index 9dad61dc..65a9deb7 100644
--- a/.github/workflows/sandwich-quickcheck.yml
+++ b/.github/workflows/sandwich-quickcheck.yml
@@ -73,37 +73,42 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc:
-        - "8.6.5"
-        - "8.8.4"
-        - "8.10.7"
-        - "9.0.2"
-        - "9.2.7"
-        - "9.4.5"
+        include:
+        - ghc: "8.6.5"
+          resolver: "lts-14.27"
+        - ghc: "8.8.4"
+          resolver: "lts-16.31"
+        - ghc: "8.10.7"
+          resolver: "lts-18.28"
+        - ghc: "9.0.2"
+          resolver: "lts-19.33"
+        - ghc: "9.2.8"
+          resolver: "lts-20.26"
+        - ghc: "9.4.5"
+          resolver: "lts-21.0"
 
     steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
+    - uses: actions/checkout@v3
 
     - uses: haskell/actions/setup@v2
       name: Setup Haskell Stack
       with:
         ghc-version: ${{ matrix.ghc }}
-        stack-version: "2.9.3"
         enable-stack: true
+        stack-version: "latest"
 
     - uses: actions/cache@v1
       name: Cache ~/.stack
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
+        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ matrix.resolver }}-stack
 
     - name: Build
       run: |
         cd sandwich-quickcheck
-        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
+        stack build --resolver ${{matrix.resolver}} --system-ghc --test --bench --no-run-tests --no-run-benchmarks
 
     - name: Test
       run: |
         cd sandwich-quickcheck
-        stack test --system-ghc
+        stack test --resolver ${{matrix.resolver}} --system-ghc
diff --git a/.github/workflows/sandwich-webdriver.yml b/.github/workflows/sandwich-webdriver.yml
index cd84ccd9..72115836 100644
--- a/.github/workflows/sandwich-webdriver.yml
+++ b/.github/workflows/sandwich-webdriver.yml
@@ -73,30 +73,35 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc:
-        - "8.6.5"
-        - "8.8.4"
-        - "8.10.7"
-        - "9.0.2"
-        - "9.2.7"
-        - "9.4.5"
+        include:
+        - ghc: "8.6.5"
+          resolver: "lts-14.27"
+        - ghc: "8.8.4"
+          resolver: "lts-16.31"
+        - ghc: "8.10.7"
+          resolver: "lts-18.28"
+        - ghc: "9.0.2"
+          resolver: "lts-19.33"
+        - ghc: "9.2.8"
+          resolver: "lts-20.26"
+        - ghc: "9.4.5"
+          resolver: "lts-21.0"
 
     steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
+    - uses: actions/checkout@v3
 
     - uses: haskell/actions/setup@v2
       name: Setup Haskell Stack
       with:
         ghc-version: ${{ matrix.ghc }}
-        stack-version: "2.9.3"
         enable-stack: true
+        stack-version: "latest"
 
     - uses: actions/cache@v1
       name: Cache ~/.stack
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
+        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ matrix.resolver }}-stack
 
     - name: apt
       run: |
@@ -106,9 +111,9 @@ jobs:
     - name: Build
       run: |
         cd sandwich-webdriver
-        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
+        stack build --resolver ${{matrix.resolver}} --system-ghc --test --bench --no-run-tests --no-run-benchmarks
 
     - name: Test
       run: |
         cd sandwich-webdriver
-        stack test --system-ghc
+        stack test --resolver ${{matrix.resolver}} --system-ghc
diff --git a/.github/workflows/sandwich.yml b/.github/workflows/sandwich.yml
index 346aaab5..e1bb5ffb 100644
--- a/.github/workflows/sandwich.yml
+++ b/.github/workflows/sandwich.yml
@@ -69,30 +69,35 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ghc:
-        - "8.6.5"
-        - "8.8.4"
-        - "8.10.7"
-        - "9.0.2"
-        - "9.2.7"
-        - "9.4.5"
+        include:
+        - ghc: "8.6.5"
+          resolver: "lts-14.27"
+        - ghc: "8.8.4"
+          resolver: "lts-16.31"
+        - ghc: "8.10.7"
+          resolver: "lts-18.28"
+        - ghc: "9.0.2"
+          resolver: "lts-19.33"
+        - ghc: "9.2.8"
+          resolver: "lts-20.26"
+        - ghc: "9.4.5"
+          resolver: "lts-21.0"
 
     steps:
-    - uses: actions/checkout@v2
-      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
+    - uses: actions/checkout@v3
 
     - uses: haskell/actions/setup@v2
       name: Setup Haskell Stack
       with:
         ghc-version: ${{ matrix.ghc }}
-        stack-version: "2.9.3"
         enable-stack: true
+        stack-version: "latest"
 
     - uses: actions/cache@v1
       name: Cache ~/.stack
       with:
         path: ~/.stack
-        key: ${{ runner.os }}-${{ matrix.ghc }}-stack
+        key: ${{ runner.os }}-${{ matrix.ghc }}-${{ matrix.resolver }}-stack
 
     - name: apt
       run: |
@@ -102,9 +107,9 @@ jobs:
     - name: Build
       run: |
         cd sandwich
-        stack build --system-ghc --test --bench --no-run-tests --no-run-benchmarks
+        stack build --resolver ${{matrix.resolver}} --system-ghc --test --bench --no-run-tests --no-run-benchmarks
 
     - name: Test
       run: |
         cd sandwich
-        stack test --system-ghc
+        stack test --resolver ${{matrix.resolver}} --system-ghc