diff --git a/README.rst b/README.rst
index 8d780bb6..b3b82ad9 100644
--- a/README.rst
+++ b/README.rst
@@ -2,7 +2,7 @@
 anesthetic: nested sampling post-processing
 ===========================================
 :Authors: Will Handley and Lukas Hergt
-:Version: 2.1.3
+:Version: 2.1.4
 :Homepage: https://github.com/handley-lab/anesthetic
 :Documentation: http://anesthetic.readthedocs.io/
 
diff --git a/anesthetic/_version.py b/anesthetic/_version.py
index 2d31b1c3..503eeb92 100644
--- a/anesthetic/_version.py
+++ b/anesthetic/_version.py
@@ -1 +1 @@
-__version__ = '2.1.3'
+__version__ = '2.1.4'
diff --git a/anesthetic/plot.py b/anesthetic/plot.py
index c6002486..e3f3b219 100644
--- a/anesthetic/plot.py
+++ b/anesthetic/plot.py
@@ -969,7 +969,7 @@ def hist_plot_1d(ax, data, *args, **kwargs):
     xmax = quantile(data, q[-1], weights)
     range = kwargs.pop('range', (xmin, xmax))
 
-    if type(bins) == str and bins in ['knuth', 'freedman', 'blocks']:
+    if isinstance(bins, str) and bins in ['knuth', 'freedman', 'blocks']:
         try:
             h, edges, bars = hist(data, ax=ax, bins=bins,
                                   range=range, histtype=histtype,
diff --git a/tests/test_reader.py b/tests/test_reader.py
index ad28313b..911e43ec 100644
--- a/tests/test_reader.py
+++ b/tests/test_reader.py
@@ -281,14 +281,14 @@ def test_hdf5(tmp_path, root):
 
     with HDFStore(filename) as store:
         assert_frame_equal(samples, store[key])
-        assert type(store[key]) == type(samples)
+        assert type(store[key]) is type(samples)
 
     samples.to_hdf(filename, key)
 
     with HDFStore(filename) as store:
         assert_frame_equal(samples, store[key])
-        assert type(store[key]) == type(samples)
+        assert type(store[key]) is type(samples)
 
     samples_ = read_hdf(filename, key)
     assert_frame_equal(samples_, samples)
-    assert type(samples_) == type(samples)
+    assert type(samples_) is type(samples)