diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.0.3
+
+* Relax upper bound on `base`: 4.21 -> 5
+
 ## 0.1.0.2
 
 * Relax upper bound on `base`: 4.20 -> 4.21
diff --git a/anitomata.cabal b/anitomata.cabal
--- a/anitomata.cabal
+++ b/anitomata.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           anitomata
-version:        0.1.0.2
+version:        0.1.0.3
 synopsis:       Composable sprite animation
 description:    Composable 2D sprite animation in Haskell.
 category:       Game
@@ -34,7 +34,7 @@
       library
   ghc-options: -Weverything -Wno-missing-local-signatures -Wno-missing-exported-signatures -Wno-missing-import-lists -Wno-missed-specializations -Wno-all-missed-specializations -Wno-unsafe -Wno-safe -Wno-missing-safe-haskell-mode
   build-depends:
-      base >=4.17 && <4.21
+      base >=4.17 && <5
     , vector >=0.13.1.0 && <0.14
   default-language: GHC2021
 
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: anitomata
-version: 0.1.0.2
+version: 0.1.0.3
 homepage: https://sr.ht/~jship/anitomata/
 git: https://git.sr.ht/~jship/anitomata/
 license: MIT
@@ -33,7 +33,7 @@
 
 library:
   dependencies:
-  - base >= 4.17 && <4.21
+  - base >= 4.17 && <5
   - vector >= 0.13.1.0 && <0.14
   source-dirs: library