diff --git a/docs/examples/healpix_fieldlist.ipynb b/docs/examples/healpix_fieldlist.ipynb
index 676e933..56400d5 100644
--- a/docs/examples/healpix_fieldlist.ipynb
+++ b/docs/examples/healpix_fieldlist.ipynb
@@ -79,7 +79,7 @@
     "    \"url\", \n",
     "    \"https://get.ecmwf.int/repository/test-data/earthkit-regrid/examples/H8_nested_multi.grib2\")\n",
     "\n",
-    "# the target grid is a global 5x5 degree regular latitude grid\n",
+    "# the target grid is a global 5x5 degree regular latitude-longitude grid\n",
     "out_grid = {\"grid\": [5,5]}\n",
     "\n",
     "# perform interpolation for each field and add results \n",
diff --git a/docs/examples/octahedral_fieldlist.ipynb b/docs/examples/octahedral_fieldlist.ipynb
index 27c2776..afdb288 100644
--- a/docs/examples/octahedral_fieldlist.ipynb
+++ b/docs/examples/octahedral_fieldlist.ipynb
@@ -79,7 +79,7 @@
     "    \"url\", \n",
     "    \"https://get.ecmwf.int/repository/test-data/earthkit-regrid/examples/O32_multi.grib2\")\n",
     "\n",
-    "# the target grid is a global 5x5 degree regular latitude grid\n",
+    "# the target grid is a global 5x5 degree regular latitude-longitude grid\n",
     "out_grid = {\"grid\": [5,5]}\n",
     "\n",
     "# perform interpolation for each field and add results \n",
diff --git a/docs/release_notes/version_0.3_updates.rst b/docs/release_notes/version_0.3_updates.rst
index b35bd93..8ab9571 100644
--- a/docs/release_notes/version_0.3_updates.rst
+++ b/docs/release_notes/version_0.3_updates.rst
@@ -1,6 +1,13 @@
 Version 0.3 Updates
 /////////////////////////
 
+Version 0.3.4
+===============
+
+Fixes
+++++++++++++++++
+- fixed issue when the "grid" value in a gridspec could not be specified as a tuple
+
 
 Version 0.3.3
 ===============
@@ -33,7 +40,7 @@ New features
 ++++++++++++++++
 - restructured and regenerated matrix inventory
 - allow using the ``method`` keyword in :func:`interpolate` to specify the interpolation method
-- allow using earthkit-data GRIB :xref:`fieldlist` in :func:`interpolate` as input data. This only works when  the output grid is regular a latitude-longitude grid. This feature requires :xref:`earthkit-data` >= 0.6.0
+- allow using earthkit-data GRIB :xref:`fieldlist` in :func:`interpolate` as input data. This only works when  the output grid is a regular latitude-longitude grid. This feature requires :xref:`earthkit-data` >= 0.6.0
 - added notebook examples:
 
    - :ref:`/examples/healpix_fieldlist.ipynb`
diff --git a/src/earthkit/regrid/gridspec.py b/src/earthkit/regrid/gridspec.py
index ed68f7d..fe1966e 100644
--- a/src/earthkit/regrid/gridspec.py
+++ b/src/earthkit/regrid/gridspec.py
@@ -51,10 +51,18 @@ def __init__(self, gs):
         self._global_ns = None
         super().__init__(gs)
 
+    @staticmethod
+    def _normalise(d):
+        for k, v in d.items():
+            if isinstance(v, tuple):
+                d[k] = list(v)
+
     @staticmethod
     def from_dict(d):
         gs = dict(GridSpec.DEFAULTS)
         gs.update(d)
+        GridSpec._normalise(gs)
+
         t_name, t = GridSpec._infer_spec_type(gs)
         if t is None:
             raise ValueError(f"Unsupported gridspec={d}")
diff --git a/tests/test_gridspec.py b/tests/test_gridspec.py
index fd08520..2b2d32b 100644
--- a/tests/test_gridspec.py
+++ b/tests/test_gridspec.py
@@ -82,6 +82,7 @@
         ),
         ({"grid": "H128"}, {"grid": [1, 1]}),
         ({"grid": "H128", "ordering": "ring"}, {"grid": [1, 1]}),
+        ({"grid": (5, 5)}, {"grid": (10, 10)}),
     ],
 )
 def test_gridspec_ok(gs_in, gs_out):