diff --git a/.github/workflows/ci-julia-nightly.yml b/.github/workflows/ci-julia-nightly.yml
deleted file mode 100644
index 39d8b897..00000000
--- a/.github/workflows/ci-julia-nightly.yml
+++ /dev/null
@@ -1,66 +0,0 @@
-name: CI (Julia nightly)
-on:
-  pull_request:
-    branches:
-      - main
-    paths-ignore:
-      - 'LICENSE.md'
-      - 'README.md'
-      - 'utils/*'
-      - '.github/workflows/TagBot.yml'
-  push:
-    branches:
-      - main
-    paths-ignore:
-      - 'LICENSE.md'
-      - 'README.md'
-      - 'utils/*'
-      - '.github/workflows/TagBot.yml'
-    tags: '*'
-jobs:
-  test-julia-nightly:
-    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ matrix.loopvectorization_test }} - ${{ github.event_name }}
-    runs-on: ${{ matrix.os }}
-    strategy:
-      fail-fast: false
-      matrix:
-        version:
-          - 'nightly'
-        os:
-          - ubuntu-latest
-          - macOS-latest
-          - windows-latest
-        arch:
-          - x64
-        loopvectorization_test:
-          - part1
-          - part2
-          - part3
-          - part4
-          - part5
-          - part6
-    steps:
-      - uses: actions/checkout@v6
-      - uses: julia-actions/setup-julia@v2
-        with:
-          version: ${{ matrix.version }}
-          arch: ${{ matrix.arch }}
-      - uses: actions/cache@v4
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
-      - uses: julia-actions/julia-buildpkg@v1
-      - uses: julia-actions/julia-runtest@v1
-        env:
-          JULIA_NUM_THREADS: 4
-          LOOPVECTORIZATION_TEST: ${{ matrix.loopvectorization_test }}
-      - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
-        with:
-          file: lcov.info
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index be868508..765ff07a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,6 +21,7 @@ jobs:
   test:
     name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ matrix.loopvectorization_test }} - ${{ github.event_name }}
     runs-on: ${{ matrix.os }}
+    continue-on-error: ${{ matrix.version == 'pre' || matrix.version == 'nightly' }}
     strategy:
       fail-fast: false
       matrix:
@@ -28,11 +29,11 @@ jobs:
           - 'lts'
           - '1' # automatically expands to the latest stable 1.x release of Julia.
           - 'pre'
+          - 'nightly'
         os:
           - ubuntu-latest
+          - macOS-latest
           - windows-latest
-        arch:
-          - x64
         loopvectorization_test:
           - part1
           - part2
@@ -41,54 +42,15 @@ jobs:
           - part5
           - part6
         include:
-          - version: 'lts'
-            os: macOS-latest
+          # Native arch per OS. `macOS-latest` is Apple silicon since the
+          # 2024 GitHub Actions image bump; use aarch64 there and x64
+          # everywhere else.
+          - os: ubuntu-latest
+            arch: x64
+          - os: macOS-latest
             arch: aarch64
-            loopvectorization_test: part1
-          - version: 'lts'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part2
-          - version: 'lts'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part3
-          - version: 'lts'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part4
-          - version: 'lts'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part5
-          - version: 'lts'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part6
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part1
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part2
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part3
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part4
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part5
-          - version: '1'
-            os: macOS-latest
-            arch: aarch64
-            loopvectorization_test: part6
+          - os: windows-latest
+            arch: x64
     steps:
       - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
@@ -111,9 +73,10 @@ jobs:
           JULIA_NUM_THREADS: 4
           LOOPVECTORIZATION_TEST: ${{ matrix.loopvectorization_test }}
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v5
         with:
-          file: lcov.info
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
   docs:
     name: Documentation
     runs-on: ubuntu-latest