diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.1.1.3
+
+* Relax upper bound on `base`: 4.21 -> 5
+
 ## 0.1.1.2
 
 * Relax upper bound on `base`: 4.20 -> 4.21
diff --git a/anitomata-aseprite.cabal b/anitomata-aseprite.cabal
--- a/anitomata-aseprite.cabal
+++ b/anitomata-aseprite.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           anitomata-aseprite
-version:        0.1.1.2
+version:        0.1.1.3
 synopsis:       Code gen for Aseprite animations
 description:    @anitomata@ Haskell code generation for Aseprite animations.
 category:       Game
@@ -41,7 +41,7 @@
   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:
       aeson >=2.1.2.1 && <2.3
-    , base >=4.17 && <4.21
+    , base >=4.17 && <5
     , directory >=1.3.7.1 && <1.4
     , filepath >=1.4.2.2 && <1.6
     , module-munging ==0.1.*
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name: anitomata-aseprite
-version: 0.1.1.2
+version: 0.1.1.3
 homepage: https://sr.ht/~jship/anitomata/
 git: https://git.sr.ht/~jship/anitomata/
 license: MIT
@@ -40,7 +40,7 @@
 library:
   dependencies:
   - aeson >= 2.1.2.1 && <2.3
-  - base >= 4.17 && <4.21
+  - base >= 4.17 && <5
   - directory >= 1.3.7.1 && <1.4
   - filepath >= 1.4.2.2 && <1.6
   - module-munging >= 0.1 && <0.2