diff --git a/CHANGELOG.md b/CHANGELOG.md
index d3a01cd..97c671f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,20 @@
 <!-- This file is generated, please add to it using `knope document-change` in the client-library-templates repo -->
 # Changelog
 
+## 6.18.1 (2026-10-06)
+
+### Fixes
+
+#### Fix Institutions include_disabled request param to a string enum
+
+This field is only used in request parameters on GET requests. Parameters on
+GET requests are querystrings and can only ever be strings.
+
+Therefore any attempt was rejected with "One of your parameters was incorrectly
+typed" - "\"true\" is not a boolean.".
+
+This string enum "true" or "false" is our general pattern for parameters like this.
+
 ## 6.18.0 (2026-10-06)
 
 ### Features
diff --git a/README.md b/README.md
index 2c2e7e3..9f1e9fd 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ toolchain will resolve and fetch the gocardless-pro-go module automatically.
 Alternatively, you can also explicitly `go get` the package into a project:
 
 ```
-go get -u github.com/gocardless/gocardless-pro-go@v6.18.0
+go get -u github.com/gocardless/gocardless-pro-go@v6.18.1
 ```
 
 ## Initializing the client
diff --git a/VERSION b/VERSION
index de35ee7..bfd0f29 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-6.18.0
\ No newline at end of file
+6.18.1
\ No newline at end of file
diff --git a/useragent.go b/useragent.go
index bdc7945..3c38496 100644
--- a/useragent.go
+++ b/useragent.go
@@ -7,7 +7,7 @@ import (
 
 const (
 	// client library version
-	ClientLibVersion = "6.18.0"
+	ClientLibVersion = "6.18.1"
 )
 
 var userAgent string