diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5c11ac82..2be64700 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,9 +12,9 @@ jobs:
         name: Flake8
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -
-            uses: actions/setup-python@v4
+            uses: actions/setup-python@v5
             with:
                 # matches compat target in setup.py
                 python-version: '3.8'
@@ -27,7 +27,7 @@ jobs:
         name: Pylint
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 echo "- scipy" >> .test-conda-env-py3.yml
@@ -39,7 +39,7 @@ jobs:
         name: Mypy
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 curl -L -O https://tiker.net/ci-support-v0
@@ -52,7 +52,7 @@ jobs:
         name: Pytest Conda Py3
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 sudo apt update && sudo apt install octave
@@ -124,7 +124,7 @@ jobs:
         name: Examples Conda Py3
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             run: |
                 export MPLBACKEND=Agg
@@ -141,7 +141,7 @@ jobs:
         name: Documentation
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -
             uses: actions/setup-python@v4
             with:
@@ -176,13 +176,16 @@ jobs:
         name: Tests for downstream project ${{ matrix.downstream_project }}
         runs-on: ubuntu-latest
         steps:
-        -   uses: actions/checkout@v3
+        -   uses: actions/checkout@v4
         -   name: "Main Script"
             env:
                 DOWNSTREAM_PROJECT: ${{ matrix.downstream_project }}
             run: |
                 curl -L -O https://tiker.net/ci-support-v0
                 . ./ci-support-v0
+                if [[ "$DOWNSTREAM_PROJECT" == "grudge" && "$GITHUB_HEAD_REF" == "group-constr-drop-index" ]]; then
+                    DOWNSTREAM_PROJECT=https://github.com/inducer/grudge.git@grad-test-overint
+                fi
                 test_downstream "$DOWNSTREAM_PROJECT"
 
 # vim: sw=4
diff --git a/meshmode/discretization/__init__.py b/meshmode/discretization/__init__.py
index 6b74eddd..3f5ae457 100644
--- a/meshmode/discretization/__init__.py
+++ b/meshmode/discretization/__init__.py
@@ -451,13 +451,7 @@ def __init__(self,
             raise TypeError("'actx' must be an ArrayContext")
 
         self.mesh = mesh
-        groups = []
-        for igrp, mg in enumerate(mesh.groups):
-            # TODO: setting index is deprecated
-            ng = group_factory(mg, index=igrp)
-            groups.append(ng)
-
-        self.groups = groups
+        self.groups = [group_factory(mg) for mg in mesh.groups]
 
         self.real_dtype = np.dtype(real_dtype)
         self.complex_dtype = np.dtype({
diff --git a/test/test_meshmode.py b/test/test_meshmode.py
index 846ee00c..b9b93b25 100644
--- a/test/test_meshmode.py
+++ b/test/test_meshmode.py
@@ -36,7 +36,8 @@
          PytestPyOpenCLArrayContextFactory,
          ])
 
-from meshmode.mesh import SimplexElementGroup, TensorProductElementGroup
+from meshmode.mesh import (
+    MeshElementGroup, SimplexElementGroup, TensorProductElementGroup)
 from meshmode.discretization.poly_element import (
         InterpolatoryQuadratureSimplexGroupFactory,
         default_simplex_group_factory,
@@ -914,6 +915,7 @@ def test_mesh_multiple_groups(actx_factory, ambient_dim, visualize=False):
             mesh.vertices[0, mesh.groups[0].vertex_indices] < 0.0,
             axis=1).astype(np.int64)
     mesh = split_mesh_groups(mesh, element_flags)
+    assert isinstance(mesh, Mesh)
 
     assert len(mesh.groups) == 2            # pylint: disable=no-member
     assert mesh.facial_adjacency_groups
@@ -932,10 +934,19 @@ def test_mesh_multiple_groups(actx_factory, ambient_dim, visualize=False):
 
     from meshmode.discretization import Discretization
 
-    def grp_factory(mesh_el_group, index):
+    def grp_factory(mesh_el_group: MeshElementGroup):
+        index = None
+
+        for i, meg in enumerate(mesh.groups):  # pylint: disable=no-member
+            if meg is mesh_el_group:
+                index = i
+
+        if mesh_el_group.dim == mesh.ambient_dim:
+            assert index is not None
+
         return default_simplex_group_factory(
                 base_dim=ambient_dim, order=order + 2 if index == 0 else order
-                )(mesh_el_group, index)
+                )(mesh_el_group)
 
     discr = Discretization(actx, mesh, grp_factory)