diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Revision history for blockio
 
+## 0.1.1.1 -- 2025-12-10
+
+* PATCH: Support `unix-2.8.4`. See PR
+  [#807](https://github.com/IntersectMBO/lsm-tree/pull/807).
+
 ## 0.1.1.0 -- 2025-12-03
 
 * NON-BREAKING: Support `unix-2.8.6` by vendoring code related to file caching
diff --git a/blockio.cabal b/blockio.cabal
--- a/blockio.cabal
+++ b/blockio.cabal
@@ -1,6 +1,6 @@
 cabal-version:   3.4
 name:            blockio
-version:         0.1.1.0
+version:         0.1.1.1
 synopsis:        Perform batches of disk I/O operations.
 description:
   Perform batches of disk I\/O operations. Performing batches of disk I\/O can
@@ -46,7 +46,7 @@
   type:     git
   location: https://github.com/IntersectMBO/lsm-tree
   subdir:   blockio
-  tag:      blockio-0.1.1.0
+  tag:      blockio-0.1.1.1
 
 common warnings
   ghc-options:
@@ -93,7 +93,7 @@
 
   if os(linux)
     hs-source-dirs: src-linux
-    build-depends:  unix ^>=2.8.6
+    build-depends:  unix ^>=2.8.4
     other-modules:
       System.FS.BlockIO.Internal
       System.FS.BlockIO.Internal.Fcntl
@@ -104,7 +104,7 @@
 
   elif os(osx)
     hs-source-dirs: src-macos
-    build-depends:  unix ^>=2.8.6
+    build-depends:  unix ^>=2.8.4
     other-modules:
       System.FS.BlockIO.Internal
       System.FS.BlockIO.Internal.Fcntl