diff --git a/Cargo.toml b/Cargo.toml
index ca38e44..537dd57 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,7 @@ version = "1.0"
 
 [dependencies.real-tokio-openssl]
 optional = true
-version = "0.4"
+version = "0.5"
 package = "tokio-openssl"
 
 [dependencies.openssl]
@@ -66,17 +66,17 @@ package = "native-tls"
 
 [dependencies.tokio]
 optional = true
-version = "0.2"
-features = ["tcp", "dns"]
+version = "0.3"
+features = ["net"]
 
 [dependencies.real-tokio-native-tls]
 optional = true
-version = "0.1"
+version = "0.2"
 package = "tokio-native-tls"
 
 [dependencies.real-tokio-rustls]
 optional = true
-version = "^0.14"
+version = "^0.20"
 package = "tokio-rustls"
 
 [dependencies.webpki-roots]
diff --git a/src/tokio.rs b/src/tokio.rs
index 8410aeb..bab4700 100644
--- a/src/tokio.rs
+++ b/src/tokio.rs
@@ -395,7 +395,11 @@ impl<T: tokio::io::AsyncRead> AsyncRead for TokioAdapter<T> {
         cx: &mut Context<'_>,
         buf: &mut [u8],
     ) -> Poll<std::io::Result<usize>> {
-        self.project().0.poll_read(cx, buf)
+        let mut buf = tokio::io::ReadBuf::new(buf);
+        match self.project().0.poll_read(cx, &mut buf)? {
+            Poll::Pending => Poll::Pending,
+            Poll::Ready(_) => Poll::Ready(Ok(buf.filled().len())),
+        }
     }
 }
 
@@ -421,9 +425,15 @@ impl<T: AsyncRead> tokio::io::AsyncRead for TokioAdapter<T> {
     fn poll_read(
         self: Pin<&mut Self>,
         cx: &mut Context<'_>,
-        buf: &mut [u8],
-    ) -> Poll<std::io::Result<usize>> {
-        self.project().0.poll_read(cx, buf)
+        buf: &mut tokio::io::ReadBuf<'_>,
+    ) -> Poll<std::io::Result<()>> {
+        let slice = buf.initialize_unfilled();
+        let n = match self.project().0.poll_read(cx, slice)? {
+            Poll::Pending => return Poll::Pending,
+            Poll::Ready(n) => n,
+        };
+        buf.advance(n);
+        Poll::Ready(Ok(()))
     }
 }