diff --git a/README.rst b/README.rst
index 67a5471..dca5ab6 100644
--- a/README.rst
+++ b/README.rst
@@ -20,7 +20,7 @@ A **G**\ enetic **A**\ lgorithm **F**\ ramework in py\ **T**\ hon
     :target: https://www.python.org/downloads/release/python-351/
     :alt: platform
 
-.. image:: https://img.shields.io/badge/pypi-v0.5.6-blue.svg
+.. image:: https://img.shields.io/badge/pypi-v0.5.7-blue.svg
     :target: https://pypi.python.org/pypi/gaft/
     :alt: versions
 
diff --git a/gaft/__init__.py b/gaft/__init__.py
index 9e963b0..ae8e41c 100644
--- a/gaft/__init__.py
+++ b/gaft/__init__.py
@@ -3,7 +3,7 @@
 
 from .engine import GAEngine
 
-__version__ = '0.5.6'
+__version__ = '0.5.7'
 __author__ = 'ShaoZhengjiang <shaozhengjiang@gmail.com>'
 
 # Set root logger.
diff --git a/gaft/plugin_interfaces/analysis.py b/gaft/plugin_interfaces/analysis.py
index ed923b5..319fa4f 100644
--- a/gaft/plugin_interfaces/analysis.py
+++ b/gaft/plugin_interfaces/analysis.py
@@ -6,7 +6,7 @@
 
 class OnTheFlyAnalysis(metaclass=AnalysisMeta):
     ''' Class for providing an interface to easily extend and customize the behavior
-    of the on-the-fly analysis functionality of gapy.
+    of the on-the-fly analysis functionality of gaft.
 
     Attribute:
 
diff --git a/setup.py b/setup.py
index 52f329d..529acf5 100644
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@
     :target: https://www.python.org/downloads/release/python-351/
     :alt: platform
 
-.. image:: https://img.shields.io/badge/pypi-v0.5.6-blue.svg
+.. image:: https://img.shields.io/badge/pypi-v0.5.7-blue.svg
     :target: https://pypi.python.org/pypi/gaft/
     :alt: versions