diff --git a/s3/Cargo.toml b/s3/Cargo.toml
index 33ea587..3d9a331 100644
--- a/s3/Cargo.toml
+++ b/s3/Cargo.toml
@@ -33,7 +33,7 @@ cfg-if = "1"
 chrono = "0.4"
 futures = { version = "0.3", optional = true }
 hex = "0.4"
-hmac = "0.10"
+hmac = "0.11"
 http = "0.2"
 log = "0.4"
 maybe-async = { version = "0.2" }
diff --git a/s3/src/request_trait.rs b/s3/src/request_trait.rs
index ea3aec1..7e63cdf 100644
--- a/s3/src/request_trait.rs
+++ b/s3/src/request_trait.rs
@@ -115,7 +115,7 @@ pub trait Request {
         }
         let canonical_request = self.presigned_canonical_request(&headers)?;
         let string_to_sign = self.string_to_sign(&canonical_request);
-        let mut hmac = signing::HmacSha256::new_varkey(&self.signing_key()?)?;
+        let mut hmac = signing::HmacSha256::new_from_slice(&self.signing_key()?)?;
         hmac.update(string_to_sign.as_bytes());
         let signature = hex::encode(hmac.finalize().into_bytes());
         // let signed_header = signing::signed_header_string(&headers);
@@ -249,7 +249,7 @@ pub trait Request {
     fn authorization(&self, headers: &Headers) -> Result<String> {
         let canonical_request = self.canonical_request(headers);
         let string_to_sign = self.string_to_sign(&canonical_request);
-        let mut hmac = signing::HmacSha256::new_varkey(&self.signing_key()?)?;
+        let mut hmac = signing::HmacSha256::new_from_slice(&self.signing_key()?)?;
         hmac.update(string_to_sign.as_bytes());
         let signature = hex::encode(hmac.finalize().into_bytes());
         let signed_header = signing::signed_header_string(headers);
diff --git a/s3/src/signing.rs b/s3/src/signing.rs
index 2f2017e..eb00d03 100644
--- a/s3/src/signing.rs
+++ b/s3/src/signing.rs
@@ -150,13 +150,13 @@ pub fn signing_key(
     service: &str,
 ) -> Result<Vec<u8>> {
     let secret = format!("AWS4{}", secret_key);
-    let mut date_hmac = HmacSha256::new_varkey(secret.as_bytes())?;
+    let mut date_hmac = HmacSha256::new_from_slice(secret.as_bytes())?;
     date_hmac.update(datetime.format(SHORT_DATE).to_string().as_bytes());
-    let mut region_hmac = HmacSha256::new_varkey(&date_hmac.finalize().into_bytes())?;
+    let mut region_hmac = HmacSha256::new_from_slice(&date_hmac.finalize().into_bytes())?;
     region_hmac.update(region.to_string().as_bytes());
-    let mut service_hmac = HmacSha256::new_varkey(&region_hmac.finalize().into_bytes())?;
+    let mut service_hmac = HmacSha256::new_from_slice(&region_hmac.finalize().into_bytes())?;
     service_hmac.update(service.as_bytes());
-    let mut signing_hmac = HmacSha256::new_varkey(&service_hmac.finalize().into_bytes())?;
+    let mut signing_hmac = HmacSha256::new_from_slice(&service_hmac.finalize().into_bytes())?;
     signing_hmac.update(b"aws4_request");
     Ok(signing_hmac.finalize().into_bytes().to_vec())
 }