diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf42b74c8a1..ab448545776 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 ## Releases
 
-* Unreleased
+* v3.1.1 (3rd December 2021)
     - Bugfixes:
         - Fix non-JS form when all extra questions answered. #3248
         - Improve display of disabled fields in iOS.
diff --git a/README.md b/README.md
index 60472565660..7af35e64ef6 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ RSS alerts of problems in their area.
 
 It was created in 2007 by [mySociety](https://www.mysociety.org/) for reporting
 problems to UK councils and has been copied around the world. The FixMyStreet
-Platform is now at version 3.1; see CHANGELOG.md for a version history.
+Platform is now at version 3.1.1; see CHANGELOG.md for a version history.
 
 ## Installation
 
diff --git a/bin/site-specific-install.sh b/bin/site-specific-install.sh
index ae9497aef96..1324104c10e 100644
--- a/bin/site-specific-install.sh
+++ b/bin/site-specific-install.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
 # Set this to the version we want to check out
-VERSION=${VERSION_OVERRIDE:-v3.1}
+VERSION=${VERSION_OVERRIDE:-v3.1.1}
 
 PARENT_SCRIPT_URL=https://github.com/mysociety/commonlib/blob/master/bin/install-site.sh