diff --git a/lib/src/archive/entry.rs b/lib/src/archive/entry.rs
index 6a012281..cda298f6 100644
--- a/lib/src/archive/entry.rs
+++ b/lib/src/archive/entry.rs
@@ -6,7 +6,6 @@ mod options;
 mod read;
 mod write;
 
-pub(crate) use self::read::MutexRead;
 pub use self::{builder::*, header::*, meta::*, name::*, options::*};
 use self::{private::*, read::*, write::*};
 use crate::{
@@ -39,7 +38,7 @@ pub trait Entry: SealedIntoChunks {
 
 /// Readable archive entry.
 pub trait ReadEntry: Entry {
-    type Reader: Read + Sync + Send;
+    type Reader: Read;
     fn header(&self) -> &EntryHeader;
     fn metadata(&self) -> &Metadata;
     fn into_reader(self, option: ReadOption) -> io::Result<Self::Reader>;
@@ -437,9 +436,7 @@ fn decompress_reader<'r, R: Read>(
     Ok(match compression {
         Compression::No => DecompressReader::Store(reader),
         Compression::Deflate => DecompressReader::Deflate(flate2::read::ZlibDecoder::new(reader)),
-        Compression::ZStandard => {
-            DecompressReader::ZStd(MutexRead::new(zstd::Decoder::new(reader)?))
-        }
+        Compression::ZStandard => DecompressReader::ZStd(zstd::Decoder::new(reader)?),
         Compression::XZ => DecompressReader::Xz(xz2::read::XzDecoder::new(reader)),
     })
 }
diff --git a/lib/src/archive/entry/read.rs b/lib/src/archive/entry/read.rs
index 89095927..c397de11 100644
--- a/lib/src/archive/entry/read.rs
+++ b/lib/src/archive/entry/read.rs
@@ -4,23 +4,6 @@ use camellia::Camellia256;
 use crypto_common::BlockSizeUser;
 use std::io;
 use std::io::Read;
-use std::sync::Mutex;
-
-// NOTE: zstd crate not support Sync + Send trait
-pub(crate) struct MutexRead<R: Read>(Mutex<R>);
-
-impl<R: Read> MutexRead<R> {
-    pub(super) fn new(reader: R) -> Self {
-        Self(Mutex::new(reader))
-    }
-}
-
-impl<R: Read> Read for MutexRead<R> {
-    fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
-        let reader = self.0.get_mut().unwrap();
-        reader.read(buf)
-    }
-}
 
 pub(super) fn aes_ctr_cipher_reader<R: Read>(
     mut reader: R,
diff --git a/lib/src/compress.rs b/lib/src/compress.rs
index a61cca24..12324107 100644
--- a/lib/src/compress.rs
+++ b/lib/src/compress.rs
@@ -1,4 +1,3 @@
-use crate::archive::MutexRead;
 use crate::io::{TryIntoInner, TryIntoInnerWrite};
 use flate2::{read::ZlibDecoder, write::ZlibEncoder};
 use std::io::{BufReader, Read, Result, Write};
@@ -52,7 +51,7 @@ impl<'w, W: Write> TryIntoInnerWrite<W> for CompressionWriter<'w, W> {}
 pub(crate) enum DecompressReader<'r, R: Read> {
     Store(R),
     Deflate(ZlibDecoder<R>),
-    ZStd(MutexRead<ZStdDecoder<'r, BufReader<R>>>),
+    ZStd(ZStdDecoder<'r, BufReader<R>>),
     Xz(XzDecoder<R>),
 }