diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Change log
 
+## 0.4.0.3
+
+* Relax upper bound on `fast-logger`: 3.2.0 -> 3.3.0
+
 ## 0.4.0.2
 
 * Relax upper bound on `time`: 1.13 -> 1.14
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 0.34.6.
+-- This file has been generated from package.yaml by hpack version 0.35.1.
 --
 -- see: https://github.com/sol/hpack
 
 name:           monad-logger-aeson
-version:        0.4.0.2
+version:        0.4.0.3
 synopsis:       JSON logging using monad-logger interface
 description:    @monad-logger-aeson@ provides structured JSON logging using @monad-logger@'s
                 interface.
@@ -46,7 +46,7 @@
     , bytestring >=0.10.8.2 && <0.12.0.0
     , context >=0.2.0.0 && <0.3
     , exceptions >=0.10.0 && <0.11.0
-    , fast-logger >=2.4.11 && <3.2.0
+    , fast-logger >=2.4.11 && <3.3.0
     , monad-logger >=0.3.30 && <0.4.0
     , text >=1.2.3.1 && <1.3.0.0 || >=2.0 && <2.1
     , time >=1.8.0.2 && <1.14
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: monad-logger-aeson
-version: '0.4.0.2'
+version: '0.4.0.3'
 github: "jship/monad-logger-aeson"
 license: MIT
 license-file: LICENSE.md
@@ -34,7 +34,7 @@
   - bytestring >=0.10.8.2 && <0.12.0.0
   - context >=0.2.0.0 && <0.3
   - exceptions >=0.10.0 && <0.11.0
-  - fast-logger >=2.4.11 && <3.2.0
+  - fast-logger >=2.4.11 && <3.3.0
   - monad-logger >=0.3.30 && <0.4.0
   - text >=1.2.3.1 && <1.3.0.0 || >=2.0 && <2.1
   - time >=1.8.0.2 && <1.14