diff --git a/ChangeLog.md b/ChangeLog.md
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -2,6 +2,10 @@
 
 `tmp-proc` uses [PVP Versioning][1].
 
+## 0.5.1.4 -- 2023-07-12
+
+* Extend the version bounds of bytestring to allow 0.12
+
 ## 0.5.1.3 -- 2022-12-06
 
 * Extend the version bounds of mtl to allow 2.3.1
diff --git a/tmp-proc.cabal b/tmp-proc.cabal
--- a/tmp-proc.cabal
+++ b/tmp-proc.cabal
@@ -1,6 +1,6 @@
 cabal-version:      3.0
 name:               tmp-proc
-version:            0.5.1.3
+version:            0.5.1.4
 synopsis:           Run 'tmp' processes in integration tests
 description:
   @tmp-proc@ runs services in docker containers for use in integration tests.
@@ -56,7 +56,7 @@
   build-depends:
     , async       ^>=2.2.1
     , base        >=4.11     && <5
-    , bytestring  >=0.10.8.2 && <0.12
+    , bytestring  >=0.10.8.2 && <0.12.1
     , mtl         >=2.2 && <2.3 || >= 2.3.1 && <2.4
     , network     >=2.6.3.6  && <3.2
     , process     ^>=1.6.3.0