diff --git a/changelog.md b/changelog.md
index b82703e..e43d7f6 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,9 @@
 # Changelog for [`unix` package](http://hackage.haskell.org/package/unix)
 
+## 2.8.5.1 *Apr 2023*
+
+  * fix building with newer filepath/os-string when `#ifndef HAVE_OPENPTY`
+
 ## 2.8.5.0 *Dec 2023*
 
   * allow building with newer filepath/os-string
diff --git a/unix.cabal b/unix.cabal
index eca53cd..1f37c90 100644
--- a/unix.cabal
+++ b/unix.cabal
@@ -1,6 +1,6 @@
 cabal-version:  1.12
 name:           unix
-version:        2.8.5.0
+version:        2.8.5.1
 -- NOTE: Don't forget to update ./changelog.md
 
 license:        BSD3