From dd449c76ffe12b7b665dead3ba3edb9a76017a06 Mon Sep 17 00:00:00 2001
From: Peter Kraus <peter.kraus@tu-berlin.de>
Date: Thu, 22 Feb 2024 16:41:42 +0100
Subject: [PATCH] Fix dtype issue.

---
 setup.py                    | 2 +-
 src/dgpost/utils/extract.py | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/setup.py b/setup.py
index 6d1bf84..ed1f91e 100644
--- a/setup.py
+++ b/setup.py
@@ -42,7 +42,7 @@
         "chemicals>=1.0.0",
         "rdkit>=2022.3",
         "h5netcdf~=1.0",
-        "xarray < 2023.11",
+        "xarray ~= 2024.02",
         "xarray-datatree>=0.0.12",
         "dgbowl-schemas>=116",
         "matplotlib>=3.5.0",
diff --git a/src/dgpost/utils/extract.py b/src/dgpost/utils/extract.py
index 572de2b..82e3f76 100644
--- a/src/dgpost/utils/extract.py
+++ b/src/dgpost/utils/extract.py
@@ -256,7 +256,7 @@ def get_key_recurse(dt, keys):
         if len(vals.coords.dims) > 1:
             assert "uts" in vals.coords.dims
             for coord in vals.coords.dims:
-                if vals.coords.dtypes[coord] in {np.dtype("O")}:
+                if vals.coords.dtypes[coord].kind in {"O", "U"}:
                     splits = vals[coord].values
                     break
         else: