diff --git a/.github/workflows/Tests.yml b/.github/workflows/Tests.yml
index 2fdf6a9..f15dcba 100644
--- a/.github/workflows/Tests.yml
+++ b/.github/workflows/Tests.yml
@@ -20,19 +20,5 @@ concurrency:
 
 jobs:
   tests:
-    name: "Tests"
-    strategy:
-      fail-fast: false
-      matrix:
-        version:
-          - "1"
-          - "lts"
-        os:
-          - "ubuntu-latest"
-          - "macos-latest"
-          - "windows-latest"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
-    with:
-      julia-version: "${{ matrix.version }}"
-      os: "${{ matrix.os }}"
+    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..8b1a6ae
--- /dev/null
+++ b/test/test_groups.toml
@@ -0,0 +1,9 @@
+# Root test-group matrix for ModelingToolkitNeuralNets.jl, consumed by the
+# canonical grouped-tests.yml@v1 caller. The single "All" group reproduces the
+# previous Tests.yml matrix: the full suite (QA + functional tests, dispatched
+# via GROUP=All in test/runtests.jl) on Julia "1" and "lts", across all three
+# OSes. runtests.jl runs QA whenever GROUP != "Core", so GROUP=All runs
+# everything in one job per cell, matching the old behavior exactly.
+[All]
+versions = ["1", "lts"]
+os = ["ubuntu-latest", "macos-latest", "windows-latest"]