diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Revision history for cuckoo
 
+## 0.2.1 -- 2020-08-06
+
+* Support random-1.2.0
+
+* Fix doctest test-suite
+
+* Relax lower bound of primitive to 0.6.4.0
+
 ## 0.2.0.1 -- 2019-08-20
 
 * Fixed and improved example.
diff --git a/cuckoo.cabal b/cuckoo.cabal
--- a/cuckoo.cabal
+++ b/cuckoo.cabal
@@ -1,6 +1,6 @@
 cabal-version: 2.2
 name: cuckoo
-version: 0.2.0.1
+version: 0.2.1
 synopsis: Haskell Implementation of Cuckoo Filters
 Description:
     Haskell implementation of Cuckoo filters as described in
@@ -25,11 +25,12 @@
 license-file: LICENSE
 author: Lars Kuhtz
 maintainer: lakuhtz@gmail.com
-copyright: Copyright (c) 2019, Lars Kuhtz <lakuhtz@gmail.com>
+copyright: Copyright (c) 2019-2020 Lars Kuhtz <lakuhtz@gmail.com>
 category: Data
 tested-with:
-      GHC==8.6.5
-      GHC==8.4.4
+    GHC==8.10.1
+    GHC==8.8.4
+    GHC==8.6.5
 extra-source-files:
     README.md
     CHANGELOG.md
@@ -57,7 +58,7 @@
         -Wall
     build-depends:
           base >=4.11 && <4.15
-        , primitive >=0.7
+        , primitive >=0.6.4.0
 
     if flag(pcg-random)
         build-depends:
@@ -86,7 +87,7 @@
         -- external
         , base >=4.11 && <4.15
         , memory >=0.14
-        , primitive >=0.7
+        , primitive >=0.6.4.0
         , vector >=0.12
 
 test-suite tests
@@ -122,8 +123,11 @@
         -with-rtsopts=-N
     main-is: doctest.hs
     build-depends:
-          base >=4.11 && <4.15
+          cuckoo
+        , base >=4.11 && <4.15
         , doctest >= 0.16
+        , memory >=0.14
+        , primitive >=0.6.4.0
 
 benchmark spellchecker
     type: exitcode-stdio-1.0
diff --git a/lib/random/System/Random/Internal.hs b/lib/random/System/Random/Internal.hs
--- a/lib/random/System/Random/Internal.hs
+++ b/lib/random/System/Random/Internal.hs
@@ -57,7 +57,12 @@
 
 import Control.Monad.Primitive
 import Data.STRef
+
+#if MIN_VERSION_random(1,2,0)
+import System.Random hiding (uniform, uniformR)
+#else
 import System.Random
+#endif
 
 type Variate a = (Random a)
 
diff --git a/src/Data/Cuckoo.hs b/src/Data/Cuckoo.hs
--- a/src/Data/Cuckoo.hs
+++ b/src/Data/Cuckoo.hs
@@ -4,6 +4,7 @@
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE KindSignatures #-}
 {-# LANGUAGE LambdaCase #-}
+{-# LANGUAGE PackageImports #-}
 {-# LANGUAGE ScopedTypeVariables #-}
 {-# LANGUAGE TypeApplications #-}
 
@@ -126,7 +127,7 @@
 
 import Prelude hiding (null)
 
-import System.Random.Internal
+import "cuckoo" System.Random.Internal
 
 import Text.Printf
 
diff --git a/src/Data/Cuckoo/Internal.hs b/src/Data/Cuckoo/Internal.hs
--- a/src/Data/Cuckoo/Internal.hs
+++ b/src/Data/Cuckoo/Internal.hs
@@ -66,9 +66,12 @@
 --
 -- For instance,
 --
--- prop> fit 7 3 == 3
--- prop> fit 6 3 == 2
+-- >>> fit 7 3
+-- 3
 --
+-- >>> fit 6 3
+-- 2
+--
 fit :: Real a => Real b => Integral c => a -> b -> c
 fit a b = ceiling @Double $ realToFrac a / realToFrac b
 {-# INLINE fit #-}
@@ -78,8 +81,11 @@
 --
 -- For instance,
 --
--- prop> fit 7 3 == 3
--- prop> fit 6 3 == 2
+-- >>> intFit 7 3
+-- 3
+--
+-- >>> intFit 6 3
+-- 2
 --
 intFit :: Integral a => Integral b => a -> b -> a
 intFit a b = 1 + (a - 1) `div` int b