diff --git a/docs/source/conf.py b/docs/source/conf.py
index 8039793..edda689 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -25,8 +25,8 @@
 author = 'Qing Yu'
 
 # The full version, including alpha/beta/rc tags
-release = '0.4.12'
-version = '0.4.12'
+release = '0.4.13'
+version = '0.4.13'
 html_logo = "_static/logo-wordmark-light.png"
 html_favicon = '_static/logo2.ico'
 # -- General configuration ---------------------------------------------------
diff --git a/setup.py b/setup.py
index c37d1cb..eb860cb 100644
--- a/setup.py
+++ b/setup.py
@@ -5,9 +5,9 @@
 
 setuptools.setup(
     name="transbigdata",
-    version="0.4.12",
+    version="0.4.13",
     author="Qing Yu",
-    author_email="qingyu0815@foxmail.com",
+    author_email="yuq@sustech.edu.cn",
     description="A Python package developed for transportation spatio-temporal big data processing and analysis.",
     long_description=long_description,
     long_description_content_type="text/markdown",
diff --git a/src/transbigdata/__init__.py b/src/transbigdata/__init__.py
index 098a454..1dab356 100644
--- a/src/transbigdata/__init__.py
+++ b/src/transbigdata/__init__.py
@@ -33,8 +33,8 @@
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 """
 
-__version__ = '0.4.12'
-__author__ = 'Qing Yu <qingyu0815@foxmail.com>'
+__version__ = '0.4.13'
+__author__ = 'Qing Yu <yuq@sustech.edu.cn>'
 
 # module level doc-string
 __doc__ = """
diff --git a/src/transbigdata/plotmap.py b/src/transbigdata/plotmap.py
index 75d139e..b88d658 100644
--- a/src/transbigdata/plotmap.py
+++ b/src/transbigdata/plotmap.py
@@ -273,8 +273,8 @@ def loadfig(filename):
                     return None  # pragma: no cover
             except Exception as e:
                 if printlog:  # pragma: no cover
-                    print(e)
-                return None
+                    print(e) # pragma: no cover
+                return None # pragma: no cover
 
         tile = loadfig(filename)
         if tile is None: