diff --git a/README.md b/README.md
index 26ab1069..785fc293 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,7 @@ To build with the MSRV you will need to pin `serde` (if you have the feature ena
 ```
 # serde 1.0.157 uses syn 2.0 which requires edition 2021
 cargo update -p serde --precise 1.0.156
+cargo update -p half --precise 1.7.1
 ```
 
 before building. (And if your code is a library, your downstream users will need to run these
diff --git a/fuzz/fuzz_targets/bitcoin/deserialize_prefilled_transaction.rs b/fuzz/fuzz_targets/bitcoin/deserialize_prefilled_transaction.rs
index cc98b7c2..8399b6c0 100644
--- a/fuzz/fuzz_targets/bitcoin/deserialize_prefilled_transaction.rs
+++ b/fuzz/fuzz_targets/bitcoin/deserialize_prefilled_transaction.rs
@@ -7,7 +7,7 @@ fn do_test(data: &[u8]) {
 
     match tx_result {
         Err(_) => {},
-        Ok(mut tx) => {
+        Ok(tx) => {
             let ser = bitcoin::consensus::encode::serialize(&tx);
             assert_eq!(&ser[..], data);
         }
diff --git a/fuzz/fuzz_targets/bitcoin/deserialize_witness.rs b/fuzz/fuzz_targets/bitcoin/deserialize_witness.rs
index d4abe688..afd5cce6 100644
--- a/fuzz/fuzz_targets/bitcoin/deserialize_witness.rs
+++ b/fuzz/fuzz_targets/bitcoin/deserialize_witness.rs
@@ -8,7 +8,7 @@ fn do_test(data: &[u8]) {
     let w: Result<Witness, _> = deserialize(data);
     if let Ok(witness) = w {
         let serialized = serialize(&witness);
-        assert_eq!(data, serialized);
+        assert_eq!(data, &serialized[..]);
     }
 }
 
diff --git a/fuzz/fuzz_targets/bitcoin/script_bytes_to_asm_fmt.rs b/fuzz/fuzz_targets/bitcoin/script_bytes_to_asm_fmt.rs
index fff77541..028bcf01 100644
--- a/fuzz/fuzz_targets/bitcoin/script_bytes_to_asm_fmt.rs
+++ b/fuzz/fuzz_targets/bitcoin/script_bytes_to_asm_fmt.rs
@@ -17,7 +17,7 @@ impl fmt::Write for NullWriter {
 
 fn do_test(data: &[u8]) {
     let mut writer = NullWriter;
-    bitcoin::Script::from_bytes(data).fmt_asm(&mut writer);
+    bitcoin::Script::from_bytes(data).fmt_asm(&mut writer).unwrap();
 }
 
 fn main() {
diff --git a/fuzz/fuzz_targets/hashes/cbor.rs b/fuzz/fuzz_targets/hashes/cbor.rs
index 65d0a4ee..20b904bf 100644
--- a/fuzz/fuzz_targets/hashes/cbor.rs
+++ b/fuzz/fuzz_targets/hashes/cbor.rs
@@ -37,9 +37,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/json.rs b/fuzz/fuzz_targets/hashes/json.rs
index 87518698..cbfb735c 100644
--- a/fuzz/fuzz_targets/hashes/json.rs
+++ b/fuzz/fuzz_targets/hashes/json.rs
@@ -37,9 +37,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/ripemd160.rs b/fuzz/fuzz_targets/hashes/ripemd160.rs
index 6e007782..6fc668ba 100644
--- a/fuzz/fuzz_targets/hashes/ripemd160.rs
+++ b/fuzz/fuzz_targets/hashes/ripemd160.rs
@@ -29,9 +29,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/sha1.rs b/fuzz/fuzz_targets/hashes/sha1.rs
index 4558c689..84b14356 100644
--- a/fuzz/fuzz_targets/hashes/sha1.rs
+++ b/fuzz/fuzz_targets/hashes/sha1.rs
@@ -29,9 +29,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/sha256.rs b/fuzz/fuzz_targets/hashes/sha256.rs
index d47f6088..88498997 100644
--- a/fuzz/fuzz_targets/hashes/sha256.rs
+++ b/fuzz/fuzz_targets/hashes/sha256.rs
@@ -29,9 +29,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/sha512.rs b/fuzz/fuzz_targets/hashes/sha512.rs
index 81f945d9..dd910048 100644
--- a/fuzz/fuzz_targets/hashes/sha512.rs
+++ b/fuzz/fuzz_targets/hashes/sha512.rs
@@ -29,9 +29,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {
diff --git a/fuzz/fuzz_targets/hashes/sha512_256.rs b/fuzz/fuzz_targets/hashes/sha512_256.rs
index 3cdb0090..af94f708 100644
--- a/fuzz/fuzz_targets/hashes/sha512_256.rs
+++ b/fuzz/fuzz_targets/hashes/sha512_256.rs
@@ -29,9 +29,9 @@ mod tests {
         for (idx, c) in hex.as_bytes().iter().enumerate() {
             b <<= 4;
             match *c {
-                b'A'...b'F' => b |= c - b'A' + 10,
-                b'a'...b'f' => b |= c - b'a' + 10,
-                b'0'...b'9' => b |= c - b'0',
+                b'A'..=b'F' => b |= c - b'A' + 10,
+                b'a'..=b'f' => b |= c - b'a' + 10,
+                b'0'..=b'9' => b |= c - b'0',
                 _ => panic!("Bad hex"),
             }
             if (idx & 1) == 1 {