diff --git a/cryptohash-sha256.cabal b/cryptohash-sha256.cabal
--- a/cryptohash-sha256.cabal
+++ b/cryptohash-sha256.cabal
@@ -1,6 +1,6 @@
 cabal-version:       2.0
 name:                cryptohash-sha256
-version:             0.11.102.0
+version:             0.11.102.1
 
 synopsis:            Fast, pure and practical SHA-256 implementation
 description: {
@@ -56,9 +56,12 @@
                    , GHC == 8.2.2
                    , GHC == 8.4.4
                    , GHC == 8.6.5
-                   , GHC == 8.8.3
-                   , GHC == 8.10.1
+                   , GHC == 8.8.4
+                   , GHC == 8.10.4
+                   , GHC == 9.0.1
+                   , GHC == 9.2.0.20210821
 
+
 extra-source-files:  cbits/hs_sha256.h
                      changelog.md
 
@@ -81,7 +84,7 @@
 
   ghc-options:       -Wall
 
-  build-depends:     base              >= 4.5 && < 4.15
+  build-depends:     base              >= 4.5 && < 4.17
 
   exposed-modules:   Crypto.Hash.SHA256
 
@@ -130,7 +133,7 @@
 
                    , base16-bytestring ^>= 0.1.1 || ^>= 1.0.0
                    , SHA               ^>= 1.6.4
-                   , tasty             ^>= 1.1
+                   , tasty             ^>= 1.4
                    , tasty-quickcheck  ^>= 0.10
                    , tasty-hunit       ^>= 0.10
 
@@ -141,8 +144,10 @@
   main-is:           bench-sha256.hs
   hs-source-dirs:    src-bench
   build-depends:     cryptohash-sha256
-                   , cryptohash-sha256-pure ^>= 0.1.0
                    , SHA               ^>= 1.6.4
                    , base
-                   , bytestring
+                   , bytestring        ^>= 0.10
                    , criterion         ^>= 1.5
+
+  -- not yet public
+  -- build-depends: cryptohash-sha256-pure ^>= 0.1.0
diff --git a/src-bench/bench-sha256.hs b/src-bench/bench-sha256.hs
--- a/src-bench/bench-sha256.hs
+++ b/src-bench/bench-sha256.hs
@@ -1,12 +1,16 @@
+{-# LANGUAGE CPP #-}
 {-# LANGUAGE BangPatterns #-}
 {-# LANGUAGE PackageImports #-}
 
 import           Criterion.Main
 
 import qualified "cryptohash-sha256"      Crypto.Hash.SHA256        as IUT
-import qualified "cryptohash-sha256-pure" Crypto.Hash.SHA256.Legacy as Pure
 import qualified Data.Digest.Pure.SHA                               as REF
 
+#ifdef VERSION_cryptohash_sha256_pure
+import qualified "cryptohash-sha256-pure" Crypto.Hash.SHA256.Legacy as Pure
+#endif
+
 import qualified Data.ByteString      as B
 import qualified Data.ByteString.Lazy as L
 
@@ -16,11 +20,13 @@
     bs = B.replicate sz 0
     msg = "bs-" ++ show sz
 
+#ifdef VERSION_cryptohash_sha256_pure
 benchSize'Pure :: Int -> Benchmark
 benchSize'Pure sz = bs `seq` bench msg (whnf Pure.hash bs)
   where
     bs = B.replicate sz 0
     msg = "bs-" ++ show sz
+#endif
 
 benchSize'REF :: Int -> Benchmark
 benchSize'REF sz = bs `seq` bench msg (whnf REF.sha256 bs)
@@ -50,6 +56,8 @@
           , L.length lbs64x256  `seq` bench "lbs64x256"  (whnf IUT.hashlazy lbs64x256)
           , L.length lbs64x4096 `seq` bench "lbs64x4096" (whnf IUT.hashlazy lbs64x4096)
           ]
+
+#ifdef VERSION_cryptohash_sha256_pure
         , bgroup "cryptohash-sha256-pure"
           [ benchSize'Pure 0
           , benchSize'Pure 32
@@ -66,6 +74,7 @@
           , L.length lbs64x256  `seq` bench "lbs64x256"  (whnf Pure.hashlazy lbs64x256)
           , L.length lbs64x4096 `seq` bench "lbs64x4096" (whnf Pure.hashlazy lbs64x4096)
           ]
+#endif
         , bgroup "SHA"
           [ benchSize'REF 0
           , benchSize'REF 32