diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdef46b..b45a9c5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Python Buildpack Changelog
 
+# 135
+
+Upgrade Pipenv to v2018.5.18.
+
 # 134
 
 Default to 3.6.5, bugfixes.
diff --git a/README.md b/README.md
index ba5b5ca..0a5aed1 100644
--- a/README.md
+++ b/README.md
@@ -23,9 +23,9 @@ Deploying a Python application couldn't be easier:
     $ git push heroku master
     …
     -----> Python app detected
-    -----> Installing python-3.6.4
+    -----> Installing python-3.6.5
     -----> Installing pip
-    -----> Installing requirements with Pipenv 11.7.1…
+    -----> Installing requirements with Pipenv 2018.5.18…
            ...
            Installing dependencies from Pipfile…
     -----> Discovering process types
@@ -58,5 +58,5 @@ Or, with a `runtime.txt` file:
 
 Runtime options include:
 
-- `python-3.6.4`
+- `python-3.6.5`
 - `python-2.7.15`