diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b641645..4b447d9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -21,28 +21,5 @@ concurrency:
 
 jobs:
   tests:
-    name: "Tests"
-    strategy:
-      fail-fast: false
-      matrix:
-        group:
-          - "All"
-          - "nopre"
-        version:
-          - "1"
-          - "lts"
-          - "pre"
-        os:
-          - ubuntu-latest
-          - macOS-latest
-          - windows-latest
-        exclude:
-          # Don't run nopre tests on pre-release Julia
-          - group: "nopre"
-            version: "pre"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
-    with:
-      julia-version: "${{ matrix.version }}"
-      os: "${{ matrix.os }}"
-      group: "${{ matrix.group }}"
+    uses: "SciML/.github/.github/workflows/grouped-tests.yml@v1"
     secrets: "inherit"
diff --git a/test/test_groups.toml b/test/test_groups.toml
new file mode 100644
index 0000000..efba756
--- /dev/null
+++ b/test/test_groups.toml
@@ -0,0 +1,13 @@
+# Root test-group matrix for CurveFit.jl, consumed by the reusable
+# grouped-tests.yml workflow via scripts/compute_affected_sublibraries.jl
+# --root-matrix. runtests.jl reads the GROUP env var and dispatches via
+# TestItemRunner tags: "All" runs everything except :nopre-tagged items,
+# "nopre" runs only :nopre-tagged items.
+
+[All]
+versions = ["1", "lts", "pre"]
+os = ["ubuntu-latest", "macOS-latest", "windows-latest"]
+
+[nopre]
+versions = ["1", "lts"]
+os = ["ubuntu-latest", "macOS-latest", "windows-latest"]