diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@
 CHANGELOG](http://keepachangelog.com/). This project adheres to [Semantic
 Versioning](http://semver.org/).
 
+## [0.6.1] - 2019-02-17
+### Fixed
+- `base` version bump to `4.13`.
+- Conditionally exclude instances already supported by `smallcheck-1.1.3`.
+
 ## [0.6] - 2016-07-03
 ### Added
 - Support for `base-4.9` which comes bundled with `GHC-8.0.1`.
@@ -52,6 +57,7 @@
 - Initial set of utilities for creating `ByteString` and `Text` `Series`.
 - `Serial` `ByteString` and `Text` instances.
 
+[0.6.1]: https://github.com/jdnavarro/smallcheck-series/compare/v0.6...v0.6.1
 [0.6]: https://github.com/jdnavarro/smallcheck-series/compare/v0.5.1...v0.6
 [0.5.1]: https://github.com/jdnavarro/smallcheck-series/compare/v0.5...v0.5.1
 [0.5]: https://github.com/jdnavarro/smallcheck-series/compare/v0.4...v0.5
diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2015, J Daniel Navarro
+Copyright (c) 2015-2018 J Daniel Navarro
 
 All rights reserved.
 
diff --git a/Test/SmallCheck/Series/Instances.hs b/Test/SmallCheck/Series/Instances.hs
--- a/Test/SmallCheck/Series/Instances.hs
+++ b/Test/SmallCheck/Series/Instances.hs
@@ -36,18 +36,22 @@
 #if !MIN_VERSION_base(4,8,0)
 import Control.Applicative ((<$>), pure)
 #endif
+#if !MIN_VERSION_smallcheck(1,1,4)
 import Control.Applicative ((<|>), empty)
+import Control.Monad.Logic (interleave)
 import Data.Int
 import Data.Word
+#endif
+import qualified Data.Map as Map
+import Data.Map (Map)
 import qualified Data.ByteString as B
 import qualified Data.ByteString.Lazy as BL
 import qualified Data.Text as T
 import qualified Data.Text.Lazy as TL
-import Data.Map (Map)
-import qualified Data.Map as Map
 import Test.SmallCheck.Series
-import Control.Monad.Logic (interleave)
 
+#if !MIN_VERSION_smallcheck(1,1,4)
+
 instance Monad m => Serial m Int8 where series = ints
 instance Monad m => CoSerial m Int8 where coseries = coInts
 
@@ -76,8 +80,10 @@
       | i < 0 -> g ((abs i - 1))
       | otherwise -> z
 
+#if !MIN_VERSION_smallcheck(1,1,3)
 instance Monad m => Serial m Word where series = nats0
 instance Monad m => CoSerial m Word where coseries = conats0
+#endif
 
 instance Monad m => Serial m Word8 where series = nats0
 instance Monad m => CoSerial m Word8 where coseries = conats0
@@ -102,6 +108,8 @@
     if n > 0
         then f (n-1)
         else z
+
+#endif
 
 instance Monad m => Serial m B.ByteString where
     series = cons0 B.empty \/ cons2 B.cons
diff --git a/smallcheck-series.cabal b/smallcheck-series.cabal
--- a/smallcheck-series.cabal
+++ b/smallcheck-series.cabal
@@ -1,5 +1,5 @@
 name:                smallcheck-series
-version:             0.6
+version:             0.6.1
 synopsis:            Extra SmallCheck series and utilities
 description:
   Orphan
@@ -17,7 +17,7 @@
 build-type:          Simple
 extra-source-files:  README.md CHANGELOG.md AUTHORS.md
 cabal-version:       >=1.10
-tested-with:         GHC == 8.0.1
+tested-with:         GHC == 8.0.1, GHC == 8.4.4
 
 source-repository head
   type: git
@@ -32,7 +32,7 @@
                        Test.SmallCheck.Series.Text
                        Test.SmallCheck.Series.Text.Lazy
                        Test.SmallCheck.Series.Utils
-  build-depends:       base >=4.6 && <4.10,
+  build-depends:       base >=4.6 && <4.13,
                        bytestring >=0.10.0.2,
                        containers >=0.5.0.0,
                        text >=0.11.3,
@@ -46,6 +46,6 @@
   hs-source-dirs:      tests
   main-is:             doctests.hs
   ghc-options:         -Wall -threaded
-  build-depends:       base >=4.6 && <4.10,
+  build-depends:       base >=4.6 && <4.12,
                        Glob >=0.7.5,
                        doctest >=0.9.10