diff --git a/README.rst b/README.rst
index 7808577b..38a718f5 100644
--- a/README.rst
+++ b/README.rst
@@ -2,7 +2,7 @@
 anesthetic: nested sampling post-processing
 ===========================================
 :Authors: Will Handley and Lukas Hergt
-:Version: 2.5.1
+:Version: 2.5.2
 :Homepage: https://github.com/handley-lab/anesthetic
 :Documentation: http://anesthetic.readthedocs.io/
 
diff --git a/anesthetic/_version.py b/anesthetic/_version.py
index b8c54948..3bfa1a62 100644
--- a/anesthetic/_version.py
+++ b/anesthetic/_version.py
@@ -1 +1 @@
-__version__ = '2.5.1'
+__version__ = '2.5.2'
diff --git a/anesthetic/kde.py b/anesthetic/kde.py
index 31e720a8..88ce375f 100644
--- a/anesthetic/kde.py
+++ b/anesthetic/kde.py
@@ -35,8 +35,9 @@ def fastkde_1d(d, xmin=None, xmax=None):
     d_ = mirror_1d(d, xmin, xmax)
     with warnings.catch_warnings():
         warnings.simplefilter("ignore")
-        p, x = fastKDE.pdf(d_, axisExpansionFactor=f,
-                           numPointsPerSigma=10*(2-f))
+        p, x = fastKDE.pdf(d_, axis_expansion_factor=f,
+                           num_points_per_sigma=10*(2-f),
+                           use_xarray=False)
     p *= 2-f
 
     if xmin is not None:
@@ -79,8 +80,9 @@ def fastkde_2d(d_x, d_y, xmin=None, xmax=None, ymin=None, ymax=None):
 
     with warnings.catch_warnings():
         warnings.simplefilter("ignore")
-        p, (x, y) = fastKDE.pdf(d_x_, d_y_, axisExpansionFactor=f,
-                                numPointsPerSigma=10*(2-f[0])*(2-f[1]))
+        p, (x, y) = fastKDE.pdf(d_x_, d_y_, axis_expansion_factor=f,
+                                num_points_per_sigma=10*(2-f[0])*(2-f[1]),
+                                use_xarray=False)
 
     p *= (2-f[0])
     p *= (2-f[1])