diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c61c445..af9aa30 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,7 +8,7 @@ on:
   workflow_dispatch:
     inputs:
       branch:
-        default: '"stable"'
+        default: '"== 2.2"'
 
 concurrency: # Cancel stale PR builds (but not push builds)
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
@@ -19,24 +19,23 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        branch: ${{ fromJSON(format('[{0}]', inputs.branch || '"1.2.0","1.2.x","1.4.2","1.4.x","1.6.0","1.6.x","2.0.0","2.0.x","stable","devel"')) }}
+        branch: ${{ fromJSON(format('[{0}]', inputs.branch || '" == 1.2.0"," ~= 1.2.0"," == 1.4.2"," ~= 1.4.2"," == 1.6.0"," ~= 1.6.0"," == 2.0.0"," ~= 2.0.0"," == 2.2.0"," ~= 2.2.0","#devel"')) }}
 
-    name: 'nim-${{matrix.branch}}'
+    name: 'nim ${{matrix.branch}}'
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
-      - uses: jiro4989/setup-nim-action@v1
+      - uses: nim-lang/setup-nimble-action@v1
         with:
-          nim-version: ${{ matrix.branch }}
+          nimble-version: "nightly"
           repo-token: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Run tests
         run: |
-          nim --version
-          env TEST_LANG="c" nimble test
-          env TEST_LANG="cpp" nimble test
+          env TEST_LANG="c" nimble test --requires="nim${{matrix.branch}}"
+          env TEST_LANG="cpp" nimble test --requires="nim${{matrix.branch}}"
 
 
   lint:
@@ -44,16 +43,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
+      - name: Check `nph` formatting
+        uses: arnetheduck/nph-action@v1
         with:
-          fetch-depth: 2  # In PR, has extra merge commit: ^1 = PR, ^2 = base
-
-      - name: Check nph formatting
-        # Pin nph to a specific version to avoid sudden style differences.
-        run: |
-          VERSION="v0.6.0"
-          ARCHIVE="nph-linux_x64.tar.gz"
-          curl -L "https://github.com/arnetheduck/nph/releases/download/${VERSION}/${ARCHIVE}" -o ${ARCHIVE}
-          tar -xzf ${ARCHIVE}
-          ./nph .
-          git diff --exit-code
\ No newline at end of file
+          version: latest
+          options: "."
diff --git a/results.nimble b/results.nimble
index e58e292..666f316 100644
--- a/results.nimble
+++ b/results.nimble
@@ -21,7 +21,7 @@ task test, "Runs the test suite":
     for opt in ["-d:resultsGenericsOpenSym:false", "-d:resultsGenericsOpenSym:true"]:
       test opt, "tests/" & f
       if (NimMajor, NimMinor) >= (2, 0):
-        test opt & " --mm:refc", "tests/" & f
+        test opt & " --gc:refc", "tests/" & f
 
 task bench, "Run benchmark":
   test "-d:release", "benchmarks/benchmark.nim"
diff --git a/tests/test_results.nim b/tests/test_results.nim
index d434e73..fb22370 100644
--- a/tests/test_results.nim
+++ b/tests/test_results.nim
@@ -143,7 +143,7 @@ block:
   try:
     echo rErr[]
     doAssert false
-  except:
+  except Exception:
     discard
 
   when (NimMajor, NimMinor, NimPatch) >= (1, 6, 12):