diff --git a/Changelog.md b/Changelog.md
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,8 @@
+# 0.1.0.1
+
+- Add `INLINEABLE` pragmas to `bitmaskWithRejection*` functions
+- Support GHC-9.0
+
 # 0.1
 
 - Drop `random` dependency unconditionally.
diff --git a/splitmix.cabal b/splitmix.cabal
--- a/splitmix.cabal
+++ b/splitmix.cabal
@@ -1,6 +1,6 @@
 cabal-version:      >=1.10
 name:               splitmix
-version:            0.1
+version:            0.1.0.1
 synopsis:           Fast Splittable PRNG
 description:
   Pure Haskell implementation of SplitMix described in
@@ -72,9 +72,9 @@
   -- ghc-options: -fplugin=DumpCore -fplugin-opt DumpCore:core-html
 
   build-depends:
-      base     >=4.3     && <4.15
+      base     >=4.3     && <4.16
     , deepseq  >=1.3.0.0 && <1.5
-    , time     >=1.2.0.3 && <1.10
+    , time     >=1.2.0.3 && <1.11
 
   if flag(optimised-mixer)
     cpp-options: -DOPTIMISED_MIX32=1
diff --git a/src/System/Random/SplitMix.hs b/src/System/Random/SplitMix.hs
--- a/src/System/Random/SplitMix.hs
+++ b/src/System/Random/SplitMix.hs
@@ -289,10 +289,14 @@
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word32'.
 --
+-- @bitmaskWithRejection32 w32@ generates random numbers in closed-open
+-- range of @[0, w32)@.
+--
 -- @since 0.0.3
 bitmaskWithRejection32 :: Word32 -> SMGen -> (Word32, SMGen)
 bitmaskWithRejection32 0 = error "bitmaskWithRejection32 0"
 bitmaskWithRejection32 n = bitmaskWithRejection32' (n - 1)
+{-# INLINEABLE bitmaskWithRejection32 #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word64'.
 --
@@ -306,9 +310,13 @@
 bitmaskWithRejection64 :: Word64 -> SMGen -> (Word64, SMGen)
 bitmaskWithRejection64 0 = error "bitmaskWithRejection64 0"
 bitmaskWithRejection64 n = bitmaskWithRejection64' (n - 1)
+{-# INLINEABLE bitmaskWithRejection64 #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word32'.
 --
+-- @bitmaskWithRejection32' w32@ generates random numbers in closed-closed
+-- range of @[0, w32]@.
+--
 -- @since 0.0.4
 bitmaskWithRejection32' :: Word32 -> SMGen -> (Word32, SMGen)
 bitmaskWithRejection32' range = go where
@@ -318,6 +326,7 @@
            in if x' > range
               then go g'
               else (x', g')
+{-# INLINEABLE bitmaskWithRejection32' #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word64'.
 --
@@ -336,6 +345,7 @@
            in if x' > range
               then go g'
               else (x', g')
+{-# INLINEABLE bitmaskWithRejection64' #-}
 
 
 -------------------------------------------------------------------------------
diff --git a/src/System/Random/SplitMix32.hs b/src/System/Random/SplitMix32.hs
--- a/src/System/Random/SplitMix32.hs
+++ b/src/System/Random/SplitMix32.hs
@@ -271,9 +271,14 @@
 -------------------------------------------------------------------------------
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word32'.
+--
+-- @bitmaskWithRejection32 w32@ generates random numbers in closed-open
+-- range of @[0, w32)@.
+--
 bitmaskWithRejection32 :: Word32 -> SMGen -> (Word32, SMGen)
 bitmaskWithRejection32 0 = error "bitmaskWithRejection32 0"
 bitmaskWithRejection32 n = bitmaskWithRejection32' (n - 1)
+{-# INLINEABLE bitmaskWithRejection32 #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word64'.
 --
@@ -286,9 +291,13 @@
 bitmaskWithRejection64 :: Word64 -> SMGen -> (Word64, SMGen)
 bitmaskWithRejection64 0 = error "bitmaskWithRejection64 0"
 bitmaskWithRejection64 n = bitmaskWithRejection64' (n - 1)
+{-# INLINEABLE bitmaskWithRejection64 #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word32'.
 --
+-- @bitmaskWithRejection32' w32@ generates random numbers in closed-closed
+-- range of @[0, w32]@.
+--
 -- @since 0.0.4
 bitmaskWithRejection32' :: Word32 -> SMGen -> (Word32, SMGen)
 bitmaskWithRejection32' range = go where
@@ -298,6 +307,7 @@
            in if x' > range
               then go g'
               else (x', g')
+{-# INLINEABLE bitmaskWithRejection32' #-}
 
 -- | /Bitmask with rejection/ method of generating subrange of 'Word64'.
 --
@@ -316,6 +326,7 @@
            in if x' > range
               then go g'
               else (x', g')
+{-# INLINEABLE bitmaskWithRejection64' #-}
 
 -------------------------------------------------------------------------------
 -- Initialisation