diff --git a/Cargo.toml b/Cargo.toml
index 06fdd5c..208e103 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,7 +9,7 @@ readme = "README.md"
 keywords = ["base64", "utf8", "encode", "decode", "no_std"]
 categories = ["encoding"]
 license = "MIT OR Apache-2.0"
-edition = "2018"
+edition = "2021"
 rust-version = "1.57.0"
 
 [[bench]]
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
index ec3324b..3cd260e 100644
--- a/fuzz/Cargo.toml
+++ b/fuzz/Cargo.toml
@@ -4,6 +4,7 @@ name = "base64-fuzz"
 version = "0.0.1"
 authors = ["Automatically generated"]
 publish = false
+edition = "2021"
 
 [package.metadata]
 cargo-fuzz = true
diff --git a/fuzz/fuzzers/decode_random.rs b/fuzz/fuzzers/decode_random.rs
index 0c0d962..5769578 100644
--- a/fuzz/fuzzers/decode_random.rs
+++ b/fuzz/fuzzers/decode_random.rs
@@ -11,5 +11,5 @@ fuzz_target!(|data: &[u8]| {
 
     // The data probably isn't valid base64 input, but as long as it returns an error instead
     // of crashing, that's correct behavior.
-    let _ = decode_engine(&data, &engine);
+    let _ = decode_engine(data, &engine);
 });
diff --git a/fuzz/fuzzers/roundtrip.rs b/fuzz/fuzzers/roundtrip.rs
index 2097f2a..8b0a98b 100644
--- a/fuzz/fuzzers/roundtrip.rs
+++ b/fuzz/fuzzers/roundtrip.rs
@@ -5,7 +5,7 @@ extern crate base64;
 use base64::engine::DEFAULT_ENGINE;
 
 fuzz_target!(|data: &[u8]| {
-    let encoded = base64::encode_engine(&data, &DEFAULT_ENGINE);
+    let encoded = base64::encode_engine(data, &DEFAULT_ENGINE);
     let decoded = base64::decode_engine(&encoded, &DEFAULT_ENGINE).unwrap();
     assert_eq!(data, decoded.as_slice());
 });
diff --git a/fuzz/fuzzers/roundtrip_no_pad.rs b/fuzz/fuzzers/roundtrip_no_pad.rs
index d5ff485..def2ebb 100644
--- a/fuzz/fuzzers/roundtrip_no_pad.rs
+++ b/fuzz/fuzzers/roundtrip_no_pad.rs
@@ -11,7 +11,7 @@ fuzz_target!(|data: &[u8]| {
         .with_decode_padding_mode(engine::DecodePaddingMode::RequireNone);
     let engine = fast_portable::FastPortable::from(&base64::alphabet::STANDARD, config);
 
-    let encoded = base64::encode_engine(&data, &engine);
+    let encoded = base64::encode_engine(data, &engine);
     let decoded = base64::decode_engine(&encoded, &engine).unwrap();
     assert_eq!(data, decoded.as_slice());
 });
diff --git a/fuzz/fuzzers/roundtrip_random_config.rs b/fuzz/fuzzers/roundtrip_random_config.rs
index 1f5a2c1..55d7465 100644
--- a/fuzz/fuzzers/roundtrip_random_config.rs
+++ b/fuzz/fuzzers/roundtrip_random_config.rs
@@ -9,7 +9,7 @@ mod utils;
 fuzz_target!(|data: &[u8]| {
     let engine = utils::random_engine(data);
 
-    let encoded = encode_engine(&data, &engine);
+    let encoded = encode_engine(data, &engine);
     let decoded = decode_engine(&encoded, &engine).unwrap();
     assert_eq!(data, decoded.as_slice());
 });