diff --git a/HISTORY.rst b/HISTORY.rst
index bd282d8a..7d92423a 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -2,11 +2,13 @@
 History
 =======
 
-1.9.1a (master)
----------------
+1.10.0-dev (master)
+-------------------
 
 * Current unstable version
 * Added README information about Python 2.7 workaround
+* Adjusted some pricing information
+* Fixed MacOS binary build through AppVeyor
 
 1.9.0 (2020-04-27)
 ------------------
diff --git a/appveyor.yml b/appveyor.yml
index 93f71344..768af7f6 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,4 +1,4 @@
-version: 1.9.1a+{build}
+version: 1.10.0-dev+{build}
 image:
   - Visual Studio 2019
   - Ubuntu
diff --git a/safety/__init__.py b/safety/__init__.py
index 6b5802e7..8b30aed0 100644
--- a/safety/__init__.py
+++ b/safety/__init__.py
@@ -2,4 +2,4 @@
 
 __author__ = """pyup.io"""
 __email__ = 'support@pyup.io'
-__version__ = '1.9.1a'
+__version__ = '1.10.0-dev'
diff --git a/setup.py b/setup.py
index a7da1b8d..b16cc73e 100644
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@
 
 setup(
     name='safety',
-    version='1.9.1a',
+    version='1.10.0-dev',
     description="Checks installed dependencies for known vulnerabilities.",
     long_description=readme + '\n\n' + history,
     long_description_content_type="text/markdown",