diff --git a/HISTORY.md b/HISTORY.md
index 7206fca..f0497b2 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,6 +1,7 @@
 ## 1.0.4 (in progress)
 - Enable cb_histogram to be used on samples without UMIs.
 - Enable filtering of cells during `demultiplex_cells`.
+- Fix incorrect pandas.read_csv call with header=-1.
 
 ## 1.0.3 
 - Python 3 support
diff --git a/setup.py b/setup.py
index d7c944d..209df30 100644
--- a/setup.py
+++ b/setup.py
@@ -8,7 +8,7 @@ def read(fname):
 
 setup(
         name='umis',
-        version='1.0.3',
+        version='1.0.4',
         description='Package for estimating UMI counts in Transcript Tag Counting data.',
         packages=find_packages(),
         install_requires=['click', 'pysam>=0.8.3', 'pandas', 'regex', 'scipy', 'toolz'],
diff --git a/umis/umis.py b/umis/umis.py
index 09d5705..5237b57 100644
--- a/umis/umis.py
+++ b/umis/umis.py
@@ -24,7 +24,7 @@
 import scipy.io, scipy.sparse
 import click
 
-VERSION = "1.0.3"
+VERSION = "1.0.4"
 
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)