diff --git a/zarr/src/codecs/bytes_to_bytes.ml b/zarr/src/codecs/bytes_to_bytes.ml
index ec4cd83..c09e293 100644
--- a/zarr/src/codecs/bytes_to_bytes.ml
+++ b/zarr/src/codecs/bytes_to_bytes.ml
@@ -14,10 +14,13 @@ module GzipCodec = struct
       Error (Printf.sprintf "Invalid Gzip level %d" i)
 
   let encode l x =
-    Ezgzip.compress ~level:(to_int l) x
+    Bytes.Reader.to_string @@
+    Bytesrw_zlib.Gzip.compress_reads ~level:(to_int l) () @@
+    Bytes.Reader.of_string x
 
   let decode x =
-    Result.get_ok @@ Ezgzip.decompress x
+    Bytes.Reader.to_string @@
+    Bytesrw_zlib.Gzip.decompress_reads () @@ Bytes.Reader.of_string x
 
   let to_yojson l =
     `Assoc
diff --git a/zarr/src/dune b/zarr/src/dune
index 88301b0..f7998cf 100644
--- a/zarr/src/dune
+++ b/zarr/src/dune
@@ -3,8 +3,8 @@
  (public_name zarr)
  (libraries
    yojson
-   ezgzip
    bytesrw.zstd
+   bytesrw.zlib
    stdint
    checkseum)
  (ocamlopt_flags