diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index b8e9d72..9d10bf9 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.3.1
+current_version = 0.4.0
 commit = True
 tag = True
 
diff --git a/README.md b/README.md
index 0bbe809..7bfa5cd 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ These instructions will make a `slingshot` command available from your virtualen
 
 ```bash
 $ mkdir slingshot && cd slinghost
-$ pipenv install https://github.com/MITLibraries/slingshot/zipball/v0.3.1
+$ pipenv install https://github.com/MITLibraries/slingshot/zipball/v0.4.0
 $ pipenv run slingshot --version
 ```
 
@@ -19,7 +19,7 @@ $ pipenv run slingshot --version
 ```bash
 $ python3 -m venv slingshot
 $ source slingshot/bin/activate
-(slingshot)$ pip install https://github.com/MITLibraries/slingshot/zipball/v0.3.1
+(slingshot)$ pip install https://github.com/MITLibraries/slingshot/zipball/v0.4.0
 (slingshot)$ slingshot --version
 ```
 
@@ -94,7 +94,7 @@ This will increment the version number, add a commit and create a git tag. By de
 
 ```bash
 $ pipenv run slingshot --version
-slingshot, version 0.3.1
+slingshot, version 0.4.0
 $ git checkout -b new-release
 $ make release RELEASE_TYPE=minor
 Built release for v0.4.0. Make sure to run:
diff --git a/slingshot/__init__.py b/slingshot/__init__.py
index 059960e..e61f0b4 100644
--- a/slingshot/__init__.py
+++ b/slingshot/__init__.py
@@ -2,4 +2,4 @@
 Slingshot
 """
 
-__version__ = '0.3.1'
+__version__ = '0.4.0'