diff --git a/.cirrus.yml b/.cirrus.yml
index 0e64f2ae..2da107f4 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -24,7 +24,7 @@ env:
   NOX_CACHE_BUILD: "98"
   # Increment the build number to force new pip cache upload.
   PIP_CACHE_BUILD: "98"
-  # Pip package to be upgraded/installed.
+  # Pip packages to be upgraded/installed.
   PIP_CACHE_PACKAGES: "pip setuptools wheel nox pyyaml"
   # Base directory for the iris-test-data.
   IRIS_TEST_DATA_DIR: ${HOME}/iris-test-data
@@ -80,10 +80,10 @@ linux_task_template: &LINUX_TASK_TEMPLATE
       - conda install --quiet --name base nox pip coverage pyyaml
   nox_cache:
     folder: ${CIRRUS_WORKING_DIR}/.nox
+    reupload_on_changes: true
     fingerprint_script:
       - echo "${CIRRUS_TASK_NAME}"
-      - echo "$(date +%Y).$(expr $(date +%U) / ${CACHE_PERIOD}):${NOX_CACHE_BUILD}"
-      - sha256sum ${CIRRUS_WORKING_DIR}/requirements/ci/py$(echo ${PY_VER} | tr -d ".").yml
+      - echo "${NOX_CACHE_BUILD}"
       - echo "IRIS ${IRIS_SOURCE}"
   data_cache:
     folder: ${IRIS_TEST_DATA_DIR}
@@ -96,14 +96,23 @@ linux_task_template: &LINUX_TASK_TEMPLATE
       
 tests_task:
   matrix:
-    env:
-      PY_VER: 3.6
     env:
       PY_VER: 3.7
-    # env:
-    #   PY_VER: 3.8
+    env:
+      PY_VER: 3.8
   name: "${CIRRUS_OS}: py${PY_VER} tests"
   << : *LINUX_TASK_TEMPLATE
   tests_script:
     - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
     - nox --session tests -- --test-data-dir ${IRIS_TEST_DATA_DIR}/test_data
+
+# [2021-06-07] lbdreyer: Doctests are failing, see Github Issue #274
+#doctest_task:
+#  matrix:
+#    env:
+#      PY_VER: 3.7
+#  name: "${CIRRUS_OS}: py${PY_VER} tests"
+#  << : *LINUX_TASK_TEMPLATE
+#  tests_script:
+#    - export CONDA_OVERRIDE_LINUX="$(uname -r | cut -d'+' -f1)"
+#    - nox --session doctest -- --test-data-dir ${IRIS_TEST_DATA_DIR}/test_data
\ No newline at end of file
diff --git a/docs/ref/release_notes.rst b/docs/ref/release_notes.rst
index a031c0ca..bad618ac 100644
--- a/docs/ref/release_notes.rst
+++ b/docs/ref/release_notes.rst
@@ -2,6 +2,31 @@ Release Notes
 =============
 
 
+What's new in iris-grib v0.17.1
+-------------------------------
+
+:Release: 0.17.1
+:Date: 3 June 2021
+
+Bugs Fixed
+^^^^^^^^^^
+
+* `@TomDufall <https://github.com/TomDufall>`_ removed the empty slice
+  handling (originally added in v0.15.1) as this used  
+  iris.util._array_slice_ifempty which was removed in Iris v3.0.2 and is no
+  longer necessary.
+  `(PR#270) <https://github.com/SciTools/iris-grib/pull/270>`_
+
+
+Dependencies
+^^^^^^^^^^^^
+
+* now requires Iris version >= 3.0.2.
+
+* now requires Python version >= 3.7.
+
+
+
 What's new in iris-grib v0.17
 -----------------------------
 
diff --git a/iris_grib/__init__.py b/iris_grib/__init__.py
index 91fd0378..3f8e9a55 100644
--- a/iris_grib/__init__.py
+++ b/iris_grib/__init__.py
@@ -32,7 +32,7 @@
 from .message import GribMessage
 
 
-__version__ = '0.17.0'
+__version__ = '0.17.1'
 
 __all__ = ['load_cubes', 'save_grib2', 'load_pairs_from_fields',
            'save_pairs_from_cube', 'save_messages']
diff --git a/noxfile.py b/noxfile.py
index e9a029fe..fb0181a7 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -16,6 +16,7 @@
 from pathlib import Path
 
 import nox
+from nox.logger import logger
 import yaml
 
 #: Default to reusing any pre-existing nox environments.
@@ -25,99 +26,14 @@
 PACKAGE = str("iris_grib")
 
 #: Cirrus-CI environment variable hook.
-PY_VER = os.environ.get("PY_VER", ["3.6", "3.7"])
+PY_VER = os.environ.get("PY_VER", ["3.7", "3.8"])
 IRIS_SOURCE = os.environ.get("IRIS_SOURCE", ['source', 'conda-forge'])
 
 #: Default cartopy cache directory.
 CARTOPY_CACHE_DIR = os.environ.get("HOME") / Path(".local/share/cartopy")
 
 
-def venv_cached(session, requirements_file=None):
-    """
-    Determine whether the nox session environment has been cached.
-
-    Parameters
-    ----------
-    session: object
-        A `nox.sessions.Session` object.
-
-    Returns
-    -------
-    bool
-        Whether the session has been cached.
-
-    """
-    result = False
-    if not requirements_file is None:
-        yml = Path(requirements_file)
-    else:
-        yml = Path(f"requirements/ci/py{session.python.replace('.', '')}.yml")
-    tmp_dir = Path(session.create_tmp())
-    cache = tmp_dir / yml.name
-    if cache.is_file():
-        with open(yml, "rb") as fi:
-            expected = hashlib.sha256(fi.read()).hexdigest()
-        with open(cache, "r") as fi:
-            actual = fi.read()
-        result = actual == expected
-    return result
-
-
-def concat_requirements(primary, *others):
-    """Join together the dependencies of one or more requirements.yaml.
-
-    Parameters
-    ----------
-    primary: str
-        filename of the primary requirements.yaml
-
-    others: list[str]
-        list of additional requirements.yamls
-    
-    Returns
-    -------
-    yaml
-        Dictionary of yaml data: primary with the addition
-        of others[]['dependencies']
-
-    """
-    with open(primary, 'r') as f:
-        requirements = yaml.load(f, yaml.FullLoader)
-
-    for o in others:
-        with open(o, 'r') as f:
-            oreq = yaml.load(f, yaml.FullLoader)
-            requirements['dependencies'].extend(oreq['dependencies'])
-    
-    return requirements
-
-
-def cache_venv(session, requirements_file=None):
-    """
-    Cache the nox session environment.
-
-    This consists of saving a hexdigest (sha256) of the associated
-    conda requirements YAML file.
-
-    Parameters
-    ----------
-    session: object
-        A `nox.sessions.Session` object.
-
-    """
-    if requirements_file is None:
-        yml = Path(f"requirements/ci/py{session.python.replace('.', '')}.yml")
-    else:
-        yml = Path(requirements_file)
-    with open(yml, "rb") as fi:
-        hexdigest = hashlib.sha256(fi.read()).hexdigest()
-    tmp_dir = Path(session.create_tmp())
-    cache = tmp_dir / yml.name
-    with open(cache, "w") as fo:
-        fo.write(hexdigest)
-
-
-def cache_cartopy(session):
+def _cache_cartopy(session: nox.sessions.Session) -> None:
     """
     Determine whether to cache the cartopy natural earth shapefiles.
 
@@ -134,8 +50,10 @@ def cache_cartopy(session):
             "import cartopy; cartopy.io.shapereader.natural_earth()",
         )
 
-def write_iris_config(session):
-    """Add test data dir and libudunits2.so to iris config.
+
+def _write_iris_config(session: nox.sessions.Session) -> None:
+    """
+    Add test data dir and libudunits2.so to iris config.
 
     test data dir is set from session pos args. i.e. can be 
     configured by passing in on the command line:
@@ -166,8 +84,75 @@ def write_iris_config(session):
     with open(iris_config_file, 'w') as f:
         f.write(iris_config)
 
+
+def _session_lockfile(session: nox.sessions.Session) -> Path:
+    """
+    Return the path of the session lockfile for the relevant python string
+    e.g ``py38``.
+
+    """
+    lockfile_name = f"py{session.python.replace('.', '')}-linux-64.lock"
+    return Path("requirements/nox.lock") / lockfile_name
+
+
+def _file_content(file_path: Path) -> str:
+    with file_path.open("r") as file:
+        return file.read()
+
+
+def _session_cachefile(session: nox.sessions.Session) -> Path:
+    """Return the path of the session lockfile cache."""
+    tmp_dir = Path(session.create_tmp())
+    cache = tmp_dir / _session_lockfile(session).name
+    return cache
+
+
+def _venv_populated(session: nox.sessions.Session) -> bool:
+    """
+    Return True if the Conda venv has been created and the list of packages in
+    the lockfile installed.
+
+    """
+    return _session_cachefile(session).is_file()
+
+
+def _venv_changed(session: nox.sessions.Session) -> bool:
+    """
+    Return True if the installed session is different to that specified in the
+    lockfile.
+
+    """
+    result = False
+    if _venv_populated(session):
+        expected = _file_content(_session_lockfile(session))
+        actual = _file_content(_session_cachefile(session))
+        result = actual != expected
+    return result
+
+
+def _install_and_cache_venv(session: nox.sessions.Session) -> None:
+    """
+    Install and cache the nox session environment.
+    This consists of saving a hexdigest (sha256) of the associated
+    Conda lock file.
+
+    Parameters
+    ----------
+    session: object
+        A `nox.sessions.Session` object.
+
+    """
+    lockfile = _session_lockfile(session)
+    session.conda_install(f"--file={lockfile}")
+
+    with open(lockfile, "rb") as fi:
+        hexdigest = hashlib.sha256(fi.read()).hexdigest()
+    with _session_cachefile(session).open("w") as cachefile:
+        cachefile.write(hexdigest)
+
+
 @contextmanager
-def prepare_venv(session, requirements_file=None):
+def prepare_venv(session: nox.sessions.Session, iris_source: str ='conda_forge') -> None:
     """
     Create and cache the nox session conda environment, and additionally
     provide conda environment package details and info.
@@ -178,10 +163,10 @@ def prepare_venv(session, requirements_file=None):
     ----------
     session: object
         A `nox.sessions.Session` object.
-    
-    requirements_file: str
-        Path to the environment requirements file.
-        Default: requirements/ci/py{PY_VER}.yml
+
+    iris_source: str
+        Determines where Iris was sourced from. Either 'conda_forge' (the
+        default), or 'master' which refers to the Iris master branch.
 
     Notes
     -----
@@ -190,46 +175,73 @@ def prepare_venv(session, requirements_file=None):
       - https://github.com/theacodes/nox/issues/260
 
     """
-    if requirements_file is None:
-        # Determine the conda requirements yaml file.
-        requirements_file = f"requirements/ci/py{session.python.replace('.', '')}.yml"
+    venv_dir = session.virtualenv.location_name
+
+    if not _venv_populated(session):
+        # Environment has been created but packages not yet installed.
+        # Populate the environment from the lockfile.
+        logger.debug(f"Populating conda env: {venv_dir}")
+        _install_and_cache_venv(session)
+
+    elif _venv_changed(session):
+        # Destroy the environment and rebuild it.
+        logger.debug(f"Lockfile changed. Recreating conda env: {venv_dir}")
+        _reuse_original = session.virtualenv.reuse_existing
+        session.virtualenv.reuse_existing = False
+        session.virtualenv.create()
+        _install_and_cache_venv(session)
+        session.virtualenv.reuse_existing = _reuse_original
+
+    logger.debug(f"Environment up to date: {venv_dir}")
+
+    if iris_source == 'master':
+        # get latest iris
+        iris_dir = f"{session.create_tmp()}/iris"
 
-    if not venv_cached(session, requirements_file):
-        # Back-door approach to force nox to use "conda env update".
-        command = (
-            "conda",
-            "env",
-            "update",
-            f"--prefix={session.virtualenv.location}",
-            f"--file={requirements_file}",
-            "--prune",
-        )
-        session._run(*command, silent=True, external="error")    
-        cache_venv(session)
+        if os.path.exists(iris_dir):
+            # cached.  update by pulling from origin/master
+            session.run(
+                "git",
+                "-C",
+                iris_dir,
+                "pull",
+                "origin",
+                "master",
+                external=True  # use git from host environment
+            )
+        else:
+            session.run(
+                "git",
+                "clone",
+                "https://github.com/scitools/iris.git",
+                iris_dir,
+                external=True
+            )
+        session.install(iris_dir, '--no-deps')
 
-    cache_cartopy(session)
+    _cache_cartopy(session)
+    _write_iris_config(session)
+
+    # Install the iris-grib source in develop mode.
+    session.install("--no-deps", "--editable", ".")
 
-    # Allow the user to do setup things
-    # like installing iris-grib in development mode
-    yield session
-    
     # Determine whether verbose diagnostics have been requested
     # from the command line.
     verbose = "-v" in session.posargs or "--verbose" in session.posargs
 
     if verbose:
         session.run("conda", "info")
-        session.run("conda", "list", f"--prefix={session.virtualenv.location}")
+        session.run("conda", "list", f"--prefix={venv_dir}")
         session.run(
             "conda",
             "list",
-            f"--prefix={session.virtualenv.location}",
+            f"--prefix={venv_dir}",
             "--explicit",
         )
 
 
 @nox.session
-def flake8(session):
+def flake8(session: nox.sessions.Session):
     """
     Perform flake8 linting of iris-grib.
 
@@ -248,7 +260,7 @@ def flake8(session):
 
 
 @nox.session
-def black(session):
+def black(session: nox.sessions.Session):
     """
     Perform black format checking of iris-grib.
 
@@ -267,8 +279,8 @@ def black(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-@nox.parametrize('iris', IRIS_SOURCE)
-def tests(session, iris):
+@nox.parametrize('iris_source', IRIS_SOURCE)
+def tests(session: nox.sessions.Session, iris_source: str):
     """
     Perform iris-grib tests against release and development versions of iris.
 
@@ -277,51 +289,12 @@ def tests(session, iris):
     session: object
         A `nox.sessions.Session` object.
 
-    """
-    
-    if iris == 'source':
-        # get latest iris
-        iris_dir = f"{session.create_tmp()}/iris"
+    iris_source: str
+        Either 'conda_forge' if using Iris from conda-forge, or 'master' if
+        installing Iris from the Iris' master branch.
 
-        if os.path.exists(iris_dir):
-            # cached.  update by pulling from origin/master
-            session.run(
-                "git",
-                "-C",
-                iris_dir,
-                "pull",
-                "origin",
-                "master",
-                external=True  # use git from host environment
-            )
-        else:
-            session.run(
-                "git",
-                "clone",
-                "https://github.com/scitools/iris.git",
-                iris_dir,
-                external=True
-            )
-        
-        # combine iris and iris-grib requirements into one requirement list
-        requirements = concat_requirements(
-            f"requirements/ci/py{session.python.replace('.', '')}.yml",
-            f"{iris_dir}/requirements/ci/py{session.python.replace('.', '')}.yml"
-        )
-        # remove iris dependencies, we'll install these from source
-        requirements['dependencies'] = [x for x in requirements['dependencies'] 
-                                            if not x.startswith('iris')]
-        req_file = f"{session.create_tmp()}/requirements.yaml"
-        with open(req_file, 'w') as f:
-            yaml.dump(requirements, f)
-    else:
-        req_file = f"requirements/ci/py{session.python.replace('.', '')}.yml"
-    
-    with prepare_venv(session, req_file):
-        if iris == 'source':
-            session.install(iris_dir, '--no-deps')
-        session.install("--no-deps", "--editable", ".")
-        write_iris_config(session)
+    """
+    prepare_venv(session, iris_source)
 
     session.run("python", "-m", "eccodes", "selfcheck")
 
@@ -335,9 +308,8 @@ def tests(session, iris):
     )
 
 
-
 @nox.session(python=PY_VER, venv_backend="conda")
-def doctest(session):
+def doctest(session: nox.sessions.Session):
     """
     Perform iris-grib doc-tests.
 
@@ -363,7 +335,7 @@ def doctest(session):
 
 
 @nox.session(python=PY_VER, venv_backend="conda")
-def linkcheck(session):
+def linkcheck(session: nox.sessions.Session):
     """
     Perform iris-grib doc link check.
 
@@ -385,4 +357,4 @@ def linkcheck(session):
         "make",
         "linkcheck",
         external=True,
-    )
\ No newline at end of file
+    )
diff --git a/requirements/ci/py36.yml b/requirements/ci/py36.yml
deleted file mode 100644
index e51e7c59..00000000
--- a/requirements/ci/py36.yml
+++ /dev/null
@@ -1,24 +0,0 @@
-name: iris-grib-dev
-
-channels:
-  - conda-forge
-
-dependencies:
-  - python=3.6
-
-# Setup dependencies.
-  - setuptools
-
-# Core dependencies.
-  - iris>=3
-  - python-eccodes
-
-# Optional dependencies.
-  - mo_pack
-
-# Test dependencies.
-  - mock
-  - filelock
-  - pep8
-  - requests
-  - nose
diff --git a/requirements/ci/py37.yml b/requirements/ci/py37.yml
index fbcc8433..68e0f80e 100644
--- a/requirements/ci/py37.yml
+++ b/requirements/ci/py37.yml
@@ -10,7 +10,7 @@ dependencies:
   - setuptools
 
 # Core dependencies.
-  - iris>=3
+  - iris>=3.0.2
   - python-eccodes
 
 # Optional dependencies.
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index cc84dcd9..3836de41 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -10,7 +10,7 @@ dependencies:
   - setuptools
 
 # Core dependencies.
-  - iris>=3
+  - iris>=3.0.2
   - python-eccodes
 
 # Optional dependencies.
@@ -21,4 +21,4 @@ dependencies:
   - filelock
   - pep8
   - requests
-  - nose
\ No newline at end of file
+  - nose
diff --git a/requirements/core.txt b/requirements/core.txt
index 21263d7a..f96770b2 100644
--- a/requirements/core.txt
+++ b/requirements/core.txt
@@ -1,4 +1,4 @@
 # Core dependencies.
 
-scitools-iris>=3
+scitools-iris>=3.0.2
 eccodes-python
diff --git a/requirements/nox.lock/py37-linux-64.lock b/requirements/nox.lock/py37-linux-64.lock
new file mode 100644
index 00000000..21a9029d
--- /dev/null
+++ b/requirements/nox.lock/py37-linux-64.lock
@@ -0,0 +1,127 @@
+# platform: linux-64
+# env_hash: 79ed224559178fc9f6977fee4e2d80112f2bb8577c135e85152ef0a1f13ef003
+@EXPLICIT
+https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
+https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2021.5.30-ha878542_0.tar.bz2#6a777890e94194dc94a29a76d2a7e721
+https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.35.1-hea4e1c9_2.tar.bz2#83610dba766a186bdc7a116053b782a4
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran5-9.3.0-hff62375_19.tar.bz2#c2d8da3cb171e4aa642d20c6e4e42a04
+https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-ng-9.3.0-h6de172a_19.tar.bz2#cd9a24a8dde03ec0cf0e603b0bea85a1
+https://conda.anaconda.org/conda-forge/linux-64/libgfortran-ng-9.3.0-hff62375_19.tar.bz2#aea379bd68fdcdf9499fa1453f852ac1
+https://conda.anaconda.org/conda-forge/linux-64/libgomp-9.3.0-h2828fa1_19.tar.bz2#ab0a307912033126da02507b59e79ec9
+https://conda.anaconda.org/conda-forge/linux-64/_openmp_mutex-4.5-1_gnu.tar.bz2#561e277319a41d4f24f5c05a9ef63c04
+https://conda.anaconda.org/conda-forge/linux-64/libgcc-ng-9.3.0-h2828fa1_19.tar.bz2#9d5cdfc51476ee4dcdd96ed2dca3f943
+https://conda.anaconda.org/conda-forge/linux-64/bzip2-1.0.8-h7f98852_4.tar.bz2#a1fd65c7ccbf10880423d82bca54eb54
+https://conda.anaconda.org/conda-forge/linux-64/c-ares-1.17.1-h7f98852_1.tar.bz2#ed1dc233ed5e3eaa9bfbaac64d130c5e
+https://conda.anaconda.org/conda-forge/linux-64/expat-2.4.1-h9c3ff4c_0.tar.bz2#16054ef3cb3ec5d8d29d08772662f65d
+https://conda.anaconda.org/conda-forge/linux-64/geos-3.9.1-h9c3ff4c_2.tar.bz2#b9a6d9422aed3ad84ec6ccee9bfcaa0f
+https://conda.anaconda.org/conda-forge/linux-64/jbig-2.1-h7f98852_2003.tar.bz2#1aa0cee79792fa97b7ff4545110b60bf
+https://conda.anaconda.org/conda-forge/linux-64/jpeg-9d-h36c2ea0_0.tar.bz2#ea02ce6037dbe81803ae6123e5ba1568
+https://conda.anaconda.org/conda-forge/linux-64/lerc-2.2.1-h9c3ff4c_0.tar.bz2#ea833dcaeb9e7ac4fac521f1a7abec82
+https://conda.anaconda.org/conda-forge/linux-64/libaec-1.0.4-h9c3ff4c_1.tar.bz2#90dbd3066828b76fa810578e49cef920
+https://conda.anaconda.org/conda-forge/linux-64/libdeflate-1.7-h7f98852_5.tar.bz2#10e242842cd30c59c12d79371dc0f583
+https://conda.anaconda.org/conda-forge/linux-64/libev-4.33-h516909a_1.tar.bz2#6f8720dff19e17ce5d48cfe7f3d2f0a3
+https://conda.anaconda.org/conda-forge/linux-64/libffi-3.3-h58526e2_2.tar.bz2#665369991d8dd290ac5ee92fce3e6bf5
+https://conda.anaconda.org/conda-forge/linux-64/libmo_unpack-3.1.2-hf484d3e_1001.tar.bz2#95f32a6a5a666d33886ca5627239f03d
+https://conda.anaconda.org/conda-forge/linux-64/libopenblas-0.3.15-pthreads_h8fe5266_1.tar.bz2#bb5527a16584426a897f22643d9a36a6
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diff --git a/requirements/nox.lock/py38-linux-64.lock b/requirements/nox.lock/py38-linux-64.lock
new file mode 100644
index 00000000..ceebcf28
--- /dev/null
+++ b/requirements/nox.lock/py38-linux-64.lock
@@ -0,0 +1,125 @@
+# platform: linux-64
+# env_hash: 5b63d4ac76488b1798081b1ae9ca6cae022cc090016e4838a6e53c3ca1bb6e53
+@EXPLICIT
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diff --git a/setup.py b/setup.py
index 2a4afec4..492543e1 100644
--- a/setup.py
+++ b/setup.py
@@ -84,8 +84,8 @@ def file_walk_relative(top, remove=''):
     keywords         = ['iris', 'GRIB'],
     classifiers=[
         'Programming Language :: Python',
-        'Programming Language :: Python :: 3.6',
         'Programming Language :: Python :: 3.7',
+        'Programming Language :: Python :: 3.8',
         'Programming Language :: Python :: 3 :: Only',
     ],
     # NOTE: The Python 3 bindings to eccodes (eccodes-python) is available on