diff --git a/octane.cabal b/octane.cabal
--- a/octane.cabal
+++ b/octane.cabal
@@ -3,7 +3,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           octane
-version:        0.20.0
+version:        0.20.1
 synopsis:       Parse Rocket League replays.
 description:    Octane parses Rocket League replays.
 category:       Game
@@ -33,7 +33,7 @@
   ghc-options: -Wall
   build-depends:
       aeson >=0.11 && <1.3
-    , base ==4.9.*
+    , base >=4.9 && <4.11
     , bimap ==0.3.*
     , binary ==0.8.*
     , bytestring ==0.10.*
diff --git a/package.yaml b/package.yaml
--- a/package.yaml
+++ b/package.yaml
@@ -27,7 +27,7 @@
 library:
   dependencies:
   - aeson >=0.11 && <1.3
-  - base ==4.9.*
+  - base >=4.9 && <4.11
   - bimap ==0.3.*
   - binary ==0.8.*
   - bytestring ==0.10.*
@@ -44,4 +44,4 @@
 maintainer: Taylor Fausak
 name: octane
 synopsis: Parse Rocket League replays.
-version: '0.20.0'
+version: '0.20.1'