diff --git a/doc/conf.py b/doc/conf.py
index fdd19ad..c67b629 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -57,7 +57,7 @@
 version = '2.0'
 # The full version, including alpha/beta/rc tags.
 # Do not forget to update PyPi (setup.py) version
-release = '2.0.4'
+release = '2.0.5'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/isocor/__init__.py b/isocor/__init__.py
index fe2e5f1..8be18f4 100644
--- a/isocor/__init__.py
+++ b/isocor/__init__.py
@@ -4,7 +4,7 @@
 for conveniance.
 """
 
-__version__ = '2.0.4'
+__version__ = '2.0.5'
 
 from isocor.mscorrectors import MetaboliteCorrectorFactory
 from isocor.mscorrectors import LowResMetaboliteCorrector, HighResMetaboliteCorrector
diff --git a/isocor/ui/isocordb.py b/isocor/ui/isocordb.py
index 5b0652c..a6909af 100644
--- a/isocor/ui/isocordb.py
+++ b/isocor/ui/isocordb.py
@@ -60,7 +60,7 @@ def registerIsopotes(self, isotopesfile=Path("Isotopes.dat")):
         if not isotopesfile.is_file():
             raise ValueError(
                 "Isotopes database not found in:\n'{}'.".format(isotopesfile))
-        with open(str(isotopesfile), 'r') as fp:
+        with open(str(isotopesfile), 'r') as fp:  # str for compatibility with Python3.5
             self.dfIsotopes = pd.read_csv(fp)
         for i in ['element', 'mass', 'abundance']:
             if i not in self.dfIsotopes.columns:
@@ -116,7 +116,7 @@ def registerMetabolitesDB(self, metabolitesfile=Path("Metabolites.dat")):
     def registerDatafile(self, datafile=Path("mydata.tsv")):
         if not Path(datafile).is_file():
             raise ValueError("No data file selected.")
-        with open(datafile, 'r') as fp:
+        with open(str(datafile), 'r') as fp:
             self.dfDatafile = pd.read_csv(fp, delimiter='\t')
         for i in ['sample', 'metabolite', 'derivative', 'area', 'isotopologue']:
             if i not in self.dfDatafile.columns:
diff --git a/setup.py b/setup.py
index 24532ec..dbe4b34 100644
--- a/setup.py
+++ b/setup.py
@@ -7,7 +7,7 @@
 
 setuptools.setup(
     name="IsoCor",
-    version="2.0.4",
+    version="2.0.5",
     author="Pierre Millard, Baudoin Delépine, Matthieu Guionnet",
     author_email="millard@insa-toulouse.fr",
     description="IsoCor: Isotope Correction for mass spectrometry labeling experiments",