diff --git a/README.md b/README.md
index 45061f28..9a93353b 100644
--- a/README.md
+++ b/README.md
@@ -291,6 +291,10 @@ Different WordPress actions cause different surrogate keys to be purged, documen
 
 ## Changelog ##
 
+### 0.3.1 (October 27th, 2019) ###
+* Fixes reversed argument order with use of `implode()` [[#139](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/139)].
+* Various PHPCS cleanup [[#127](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/127)].
+
 ### 0.3.0 (November 27th, 2017) ###
 * Emits '404' surrogate key on 404s; purges when purging the homepage [[#107](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/107)].
 * Adds more specific filters for modifying surrogate keys in different contexts [[#109](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/109)].
diff --git a/pantheon-advanced-page-cache.php b/pantheon-advanced-page-cache.php
index f17b0452..963fb4be 100644
--- a/pantheon-advanced-page-cache.php
+++ b/pantheon-advanced-page-cache.php
@@ -7,7 +7,7 @@
  * Author URI:      https://pantheon.io
  * Text Domain:     pantheon-advanced-page-cache
  * Domain Path:     /languages
- * Version:         0.3.0
+ * Version:         0.3.1
  *
  * @package         Pantheon_Advanced_Page_Cache
  */
diff --git a/readme.txt b/readme.txt
index 6fbc4a14..9388dba6 100644
--- a/readme.txt
+++ b/readme.txt
@@ -291,6 +291,10 @@ Different WordPress actions cause different surrogate keys to be purged, documen
 
 == Changelog ==
 
+= 0.3.1 (October 27th, 2019) =
+* Fixes reversed argument order with use of `implode()` [[#139](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/139)].
+* Various PHPCS cleanup [[#127](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/127)].
+
 = 0.3.0 (November 27th, 2017) =
 * Emits '404' surrogate key on 404s; purges when purging the homepage [[#107](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/107)].
 * Adds more specific filters for modifying surrogate keys in different contexts [[#109](https://github.com/pantheon-systems/pantheon-advanced-page-cache/pull/109)].