diff --git a/rmsd/calculate_rmsd.py b/rmsd/calculate_rmsd.py
index 3d010ba..eb7f9e6 100644
--- a/rmsd/calculate_rmsd.py
+++ b/rmsd/calculate_rmsd.py
@@ -7,7 +7,7 @@
 https://github.com/charnley/rmsd
 """
 
-__version__ = "1.6.0"
+__version__ = "1.6.1"
 
 import argparse
 import copy
diff --git a/rmsd/version.py b/rmsd/version.py
index e4adfb8..f49459c 100644
--- a/rmsd/version.py
+++ b/rmsd/version.py
@@ -1 +1 @@
-__version__ = "1.6.0"
+__version__ = "1.6.1"