diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,11 @@
 For the latest version of this document, please see
 [https://github.com/DougBurke/hvega/blob/master/hvega/CHANGELOG.md](https://github.com/DougBurke/hvega/blob/master/hvega/CHANGELOG.md).
 
+## 0.12.0.5
+
+Bump to support bytestring version 0.12.0.0 (only needed if building
+the tests).
+
 ## 0.12.0.4
 
 Bump to support aeson version 2.2 (tests may require building with
diff --git a/hvega.cabal b/hvega.cabal
--- a/hvega.cabal
+++ b/hvega.cabal
@@ -1,5 +1,5 @@
 name:                hvega
-version:             0.12.0.4
+version:             0.12.0.5
 synopsis:            Create Vega-Lite visualizations (version 4) in Haskell.
 description:         This is based on the elm-vegalite package
                      (<http://package.elm-lang.org/packages/gicentre/elm-vegalite/latest>)
@@ -218,7 +218,7 @@
   build-depends:       aeson >= 1.4.2
                      , aeson-pretty == 0.8.*
                      , base
-                     , bytestring >= 0.10 && < 0.12
+                     , bytestring >= 0.10 && < 0.13
                      , containers >= 0.5.7 && < 0.7
                      , filepath
                      , tasty
diff --git a/stack.yaml b/stack.yaml
--- a/stack.yaml
+++ b/stack.yaml
@@ -5,4 +5,4 @@
 
 extra-deps: []
 
-resolver: lts-21.0
+resolver: lts-21.2