diff --git a/xarray/core/dataarray.py b/xarray/core/dataarray.py
index cd0428e73ca..6e956c613d8 100644
--- a/xarray/core/dataarray.py
+++ b/xarray/core/dataarray.py
@@ -6875,7 +6875,7 @@ def groupby(
                [[nan, nan, nan],
                 [ 3.,  4.,  5.]]])
         Coordinates:
-          * x_bins   (x_bins) object 16B (5, 15] (15, 25]
+          * x_bins   (x_bins) interval[int64, right] 16B (5, 15] (15, 25]
           * letters  (letters) object 16B 'a' 'b'
         Dimensions without coordinates: y
 
diff --git a/xarray/core/dataset.py b/xarray/core/dataset.py
index 3077b4eadb9..65942383148 100644
--- a/xarray/core/dataset.py
+++ b/xarray/core/dataset.py
@@ -10528,7 +10528,7 @@ def groupby(
         <xarray.Dataset> Size: 128B
         Dimensions:  (y: 3, x_bins: 2, letters: 2)
         Coordinates:
-          * x_bins   (x_bins) object 16B (5, 15] (15, 25]
+          * x_bins   (x_bins) interval[int64, right] 16B (5, 15] (15, 25]
           * letters  (letters) object 16B 'a' 'b'
         Dimensions without coordinates: y
         Data variables: