diff --git a/.cirrus.yml b/.cirrus.yml
index c7ce5722..4218f2c8 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -20,11 +20,11 @@ env:
   SKIP_TEST_TASK: ""
   SKIP_BENCHMARK_TASK: ""
   # Maximum cache period (in weeks) before forcing a new cache upload.
-  CACHE_PERIOD: "2"
+  CACHE_PERIOD: "0"
   # Increment the build number to force new conda cache upload.
-  CONDA_CACHE_BUILD: "1"
+  CONDA_CACHE_BUILD: "0"
   # Increment the build number to force new nox cache upload.
-  NOX_CACHE_BUILD: "2"
+  NOX_CACHE_BUILD: "0"
   # Increment the build number to force new pip cache upload.
   PIP_CACHE_BUILD: "0"
   # Pip package to be installed.
@@ -109,8 +109,6 @@ test_task:
   only_if: ${SKIP_TEST_TASK} == ""
   auto_cancellation: true
   matrix:
-    env:
-      PY_VER: "3.7"
     env:
       PY_VER: "3.8"
       COVERAGE: "true"
diff --git a/esmf_regrid/experimental/unstructured_scheme.py b/esmf_regrid/experimental/unstructured_scheme.py
index cd67e299..f4638469 100644
--- a/esmf_regrid/experimental/unstructured_scheme.py
+++ b/esmf_regrid/experimental/unstructured_scheme.py
@@ -121,7 +121,7 @@ def _mesh_to_MeshInfo(mesh):
     assert mesh.topology_dimension == 2
     meshinfo = MeshInfo(
         np.stack([coord.points for coord in mesh.node_coords], axis=-1),
-        mesh.face_node_connectivity.indices,
+        mesh.face_node_connectivity.indices_by_location(),
         mesh.face_node_connectivity.start_index,
     )
     return meshinfo
@@ -578,9 +578,9 @@ def _regrid_rectilinear_to_unstructured__perform(src_cube, regrid_info, mdtol):
     )
 
     face_node = mesh.face_node_connectivity
-    # In face_node_connectivity: `src`= face, `tgt` = node, so you want to
-    # get the length of the `src` dimension.
-    n_faces = face_node.shape[face_node.src_dim]
+    # In face_node_connectivity: `location`= face, `connected` = node, so
+    # you want to get the length of the `location` dimension.
+    n_faces = face_node.shape[face_node.location_axis]
 
     # Apply regrid to all the chunks of src_cube, ensuring first that all
     # chunks cover the entire horizontal plane (otherwise they would break
diff --git a/noxfile.py b/noxfile.py
index 6c0b9b73..b072fb08 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -16,13 +16,13 @@
 
 
 #: Default to reusing any pre-existing nox environments.
-nox.options.reuse_existing_virtualenvs = True
+nox.options.reuse_existing_virtualenvs = False
 
 #: Name of the package to test.
 PACKAGE = "esmf_regrid"
 
 #: Cirrus-CI environment variable hook.
-PY_VER = os.environ.get("PY_VER", ["3.7", "3.8"])
+PY_VER = os.environ.get("PY_VER", ["3.8"])
 
 #: Cirrus-CI environment variable hook.
 COVERAGE = os.environ.get("COVERAGE", False)
diff --git a/requirements/nox.lock/py37-linux-64.lock b/requirements/nox.lock/py37-linux-64.lock
deleted file mode 100644
index 6859b0af..00000000
--- a/requirements/nox.lock/py37-linux-64.lock
+++ /dev/null
@@ -1,260 +0,0 @@
-# platform: linux-64
-# env_hash: a6f1d4974c5a8179053125624a503e934da2b1409fb02f05df229f4f2ce95e5c
-@EXPLICIT
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-https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2#0c96522c6bdaed4b1566d11387caaf45
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-inconsolata-3.000-h77eed37_0.tar.bz2#34893075a5c9e55cdafac56607368fc6
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-source-code-pro-2.038-h77eed37_0.tar.bz2#4d59c254e01d9cde7957100457e2d5fb
-https://conda.anaconda.org/conda-forge/noarch/font-ttf-ubuntu-0.83-hab24e00_0.tar.bz2#19410c3df09dfb12d1206132a1d357c5
-https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.36.1-hea4e1c9_2.tar.bz2#bd4f2e711b39af170e7ff15163fe87ee
-https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-11.2.0-h5c6108e_11.tar.bz2#2dcb18a9a0fa31f4f29e5a9b3eade394
-https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-11.2.0-he4da1e4_11.tar.bz2#0bf83958e788f1e75ba26154cb702afe
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-https://conda.anaconda.org/conda-forge/noarch/nc-time-axis-1.4.0-pyhd8ed1ab_0.tar.bz2#9113b4e4fa2fa4a7f129c71a6f319475
-https://conda.anaconda.org/conda-forge/linux-64/netcdf-fortran-4.5.3-mpi_mpich_h1364a43_6.tar.bz2#9caa0cf923af3d037897c6d7f8ea57c0
-https://conda.anaconda.org/conda-forge/linux-64/netcdf4-1.5.8-nompi_py37hf784469_100.tar.bz2#1ec9ce2b97a876f3829e5d8853603579
-https://conda.anaconda.org/conda-forge/linux-64/pango-1.48.10-h54213e6_2.tar.bz2#b7ed7c76c9360db1f91afba2e220007b
-https://conda.anaconda.org/conda-forge/linux-64/pluggy-1.0.0-py37h89c1867_2.tar.bz2#2302f521fc19e6446a94e82662bb7061
-https://conda.anaconda.org/conda-forge/noarch/pyopenssl-21.0.0-pyhd8ed1ab_0.tar.bz2#8c49efecb7dca466e18b06015e8c88ce
-https://conda.anaconda.org/conda-forge/linux-64/pyqt-impl-5.12.3-py37he336c9b_7.tar.bz2#303251d6f2b9e60a0cd79480cf8507d2
-https://conda.anaconda.org/conda-forge/noarch/dask-2021.10.0-pyhd8ed1ab_0.tar.bz2#ef63e6ee7aadcb45083228132fbc8058
-https://conda.anaconda.org/conda-forge/linux-64/esmf-8.2.0-mpi_mpich_h4975321_100.tar.bz2#56f5c650937b1667ad0a557a0dff3bc4
-https://conda.anaconda.org/conda-forge/linux-64/gtk2-2.24.33-h539f30e_1.tar.bz2#606777b4da3664d5c9415f5f165349fd
-https://conda.anaconda.org/conda-forge/linux-64/librsvg-2.52.3-hc3c00ef_0.tar.bz2#6eecc995e05cb77fd2878ab0aa03ea52
-https://conda.anaconda.org/conda-forge/noarch/nox-2021.10.1-pyhd8ed1ab_0.tar.bz2#c29de03dc9c5595cb011a6b2204c14f5
-https://conda.anaconda.org/conda-forge/linux-64/pre-commit-2.15.0-py37h89c1867_1.tar.bz2#d0946df7d53ac1caee78d41b05b6a27e
-https://conda.anaconda.org/conda-forge/linux-64/pyqtchart-5.12-py37he336c9b_7.tar.bz2#2b1959f3a87b5ad66690340ef921323c
-https://conda.anaconda.org/conda-forge/linux-64/pyqtwebengine-5.12.1-py37he336c9b_7.tar.bz2#15f5cbcafb4889bb41da2a0a0e338f2a
-https://conda.anaconda.org/conda-forge/linux-64/pytest-6.2.5-py37h89c1867_1.tar.bz2#b4ba61b79beec04e2dce97bf18b4e81b
-https://conda.anaconda.org/conda-forge/noarch/urllib3-1.26.7-pyhd8ed1ab_0.tar.bz2#be75bab4820a56f77ba1a3fc9139c36a
-https://conda.anaconda.org/conda-forge/linux-64/esmpy-8.2.0-mpi_mpich_py37h7352969_101.tar.bz2#64fd02e7a0cefe0b5c604fea03774c73
-https://conda.anaconda.org/conda-forge/linux-64/graphviz-2.49.3-h85b4f2f_0.tar.bz2#71062453180260ef85c861996b29bd6a
-https://conda.anaconda.org/conda-forge/linux-64/pyqt-5.12.3-py37h89c1867_7.tar.bz2#1754ec587a9ac26e9507fea7eb6bebc2
-https://conda.anaconda.org/conda-forge/noarch/pytest-cov-3.0.0-pyhd8ed1ab_0.tar.bz2#0f7cac11bb696b62d378bde725bfc3eb
-https://conda.anaconda.org/conda-forge/noarch/requests-2.26.0-pyhd8ed1ab_0.tar.bz2#0ed2ccbde6db9dd5789068eb7194463f
-https://conda.anaconda.org/conda-forge/noarch/codecov-2.1.11-pyhd3deb0d_0.tar.bz2#9c661c2c14b4667827218402e6624ad5
-https://conda.anaconda.org/conda-forge/linux-64/matplotlib-3.4.3-py37h89c1867_1.tar.bz2#0f4b55d86f989450108f272290bf11ff
-https://conda.anaconda.org/conda-forge/noarch/sphinx-4.2.0-pyh6c4a22f_0.tar.bz2#ea5c6881a11a0d9c4d04f1ebae87bb34
-https://conda.anaconda.org/conda-forge/noarch/sphinx-copybutton-0.4.0-pyhd8ed1ab_0.tar.bz2#80fd2cc25ad45911b4e42d5b91593e2f
-https://conda.anaconda.org/conda-forge/noarch/sphinx-gallery-0.10.0-pyhd8ed1ab_0.tar.bz2#1a8b251e46cec2cc31add6ab5d001832
-https://conda.anaconda.org/conda-forge/noarch/sphinx-panels-0.6.0-pyhd8ed1ab_0.tar.bz2#6eec6480601f5d15babf9c3b3987f34a
-https://conda.anaconda.org/conda-forge/noarch/sphinx_rtd_theme-1.0.0-pyhd8ed1ab_0.tar.bz2#9f633f2f2869184e31acfeae95b24345
diff --git a/requirements/py37.yml b/requirements/py37.yml
deleted file mode 100644
index 007cda59..00000000
--- a/requirements/py37.yml
+++ /dev/null
@@ -1,30 +0,0 @@
-name: esmf-regrid-dev
-
-channels:
-  - conda-forge
-
-dependencies:
-  - python=3.7
-
-# Setup dependencies.
-  - setuptools>=40.8.0
-
-# Core dependencies.
-  - cartopy>=0.18
-  - numpy>=1.14
-  - scipy
-  - esmpy>=7.0
-  - iris
-
-# Test dependencies.
-  - asv
-  - black=20.8b1
-  - codecov
-  - flake8
-  - flake8-docstrings
-  - flake8-import-order
-  - nox
-  - pre-commit
-  - pytest
-  - pytest-cov
-  
diff --git a/setup.cfg b/setup.cfg
index ea9b40d4..6e5b26ed 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -8,8 +8,6 @@ classifiers =
     Natural Language :: English
     Operating System :: OS Independent
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.6
-    Programming Language :: Python :: 3.7
     Programming Language :: Python :: 3.8
     Topic :: Scientific/Engineering :: Atmospheric Science
 description = Iris regridding scheme using ESMF
@@ -30,7 +28,7 @@ version = attr: esmf_regrid.__version__
 [options]
 packages = find:
 python_requires =
-    >=3.7,<3.9
+    >=3.8,<3.9
 setup_requires =
     setuptools>=40.8.0
 zip_safe = False