diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change log
 
+## 0.4.1.1
+
+* Relax upper bound on `bytestring`: 0.12.0.0 -> 0.13.0.0
+
 ## 0.4.1.0
 
 * Support `aeson-2.2`
diff --git a/monad-logger-aeson.cabal b/monad-logger-aeson.cabal
--- a/monad-logger-aeson.cabal
+++ b/monad-logger-aeson.cabal
@@ -1,11 +1,11 @@
 cabal-version: 1.12
 
--- This file has been generated from package.yaml by hpack version 0.35.1.
+-- This file has been generated from package.yaml by hpack version 0.35.2.
 --
 -- see: https://github.com/sol/hpack
 
 name:           monad-logger-aeson
-version:        0.4.1.0
+version:        0.4.1.1
 synopsis:       JSON logging using monad-logger interface
 description:    @monad-logger-aeson@ provides structured JSON logging using @monad-logger@'s
                 interface.
@@ -43,7 +43,7 @@
   build-depends:
       aeson >=1.5.2.0 && <2.3
     , base >=4.11.1.0 && <5
-    , bytestring >=0.10.8.2 && <0.12.0.0
+    , bytestring >=0.10.8.2 && <0.13.0.0
     , context >=0.2.0.0 && <0.3
     , exceptions >=0.10.0 && <0.11.0
     , fast-logger >=2.4.11 && <3.3.0
@@ -148,7 +148,7 @@
       aeson >=1.5.2.0 && <2.3
     , aeson-diff >=1.1.0.5 && <1.2.0.0
     , base >=4.11.1.0 && <5
-    , bytestring >=0.10.8.2 && <0.12.0.0
+    , bytestring >=0.10.8.2 && <0.13.0.0
     , directory >=1.3.1.5 && <1.4.0.0
     , hspec >=2.7.9 && <2.12
     , monad-logger >=0.3.30 && <0.4.0
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: monad-logger-aeson
-version: '0.4.1.0'
+version: '0.4.1.1'
 github: "jship/monad-logger-aeson"
 license: MIT
 license-file: LICENSE.md
@@ -31,7 +31,7 @@
   dependencies:
   - aeson >=1.5.2.0 && <2.3
   - base >=4.11.1.0 && <5
-  - bytestring >=0.10.8.2 && <0.12.0.0
+  - bytestring >=0.10.8.2 && <0.13.0.0
   - context >=0.2.0.0 && <0.3
   - exceptions >=0.10.0 && <0.11.0
   - fast-logger >=2.4.11 && <3.3.0
@@ -51,7 +51,7 @@
     - aeson >=1.5.2.0 && <2.3
     - aeson-diff >=1.1.0.5 && <1.2.0.0
     - base >=4.11.1.0 && <5
-    - bytestring >=0.10.8.2 && <0.12.0.0
+    - bytestring >=0.10.8.2 && <0.13.0.0
     - directory >=1.3.1.5 && <1.4.0.0
     - hspec >=2.7.9 && <2.12
     - monad-logger >=0.3.30 && <0.4.0