diff --git a/src/blockdata/script.rs b/src/blockdata/script.rs
index 3d42d741..8cb468f0 100644
--- a/src/blockdata/script.rs
+++ b/src/blockdata/script.rs
@@ -422,7 +422,7 @@ impl Script {
     }
 
     /// Write the assembly decoding of the script to the formatter.
-    pub fn fmt_asm(&self, f: &mut fmt::Write) -> fmt::Result {
+    pub fn fmt_asm(&self, f: &mut dyn fmt::Write) -> fmt::Result {
         let mut index = 0;
         while index < self.0.len() {
             let opcode = opcodes::All::from(self.0[index]);
diff --git a/src/blockdata/transaction.rs b/src/blockdata/transaction.rs
index c9ce726b..06f36a85 100644
--- a/src/blockdata/transaction.rs
+++ b/src/blockdata/transaction.rs
@@ -24,7 +24,7 @@
 //!
 
 use std::default::Default;
-use std::{fmt, io};
+use std::{error, fmt, io};
 
 use hashes::{self, Hash, sha256d};
 use hashes::hex::FromHex;
@@ -129,12 +129,12 @@ impl fmt::Display for ParseOutPointError {
 }
 
 #[allow(deprecated)]
-impl ::std::error::Error for ParseOutPointError {
+impl error::Error for ParseOutPointError {
     fn description(&self) -> &str {
         "description() is deprecated; use Display"
     }
 
-    fn cause(&self) -> Option<&::std::error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             ParseOutPointError::Txid(ref e) => Some(e),
             ParseOutPointError::Vout(ref e) => Some(e),
diff --git a/src/consensus/encode.rs b/src/consensus/encode.rs
index 8e3f3768..32aa9512 100644
--- a/src/consensus/encode.rs
+++ b/src/consensus/encode.rs
@@ -111,7 +111,7 @@ impl fmt::Display for Error {
 
 #[allow(deprecated)]
 impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Io(ref e) => Some(e),
             Error::Psbt(ref e) => Some(e),
diff --git a/src/network/mod.rs b/src/network/mod.rs
index de8ee96a..c541f186 100644
--- a/src/network/mod.rs
+++ b/src/network/mod.rs
@@ -66,7 +66,7 @@ impl error::Error for Error {
         "description() is deprecated; use Display"
     }
 
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Io(ref e) => Some(e),
             Error::SocketMutexPoisoned | Error::SocketNotConnectedToPeer => None,
diff --git a/src/util/address.rs b/src/util/address.rs
index 771926ce..17361575 100644
--- a/src/util/address.rs
+++ b/src/util/address.rs
@@ -38,6 +38,7 @@
 
 use std::fmt::{self, Display, Formatter};
 use std::str::FromStr;
+use std::error;
 
 use bech32;
 use hashes::Hash;
@@ -87,8 +88,8 @@ impl fmt::Display for Error {
 }
 
 #[allow(deprecated)]
-impl ::std::error::Error for Error {
-    fn cause(&self) -> Option<&::std::error::Error> {
+impl error::Error for Error {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Base58(ref e) => Some(e),
             Error::Bech32(ref e) => Some(e),
diff --git a/src/util/amount.rs b/src/util/amount.rs
index b9c9c537..5d37e36c 100644
--- a/src/util/amount.rs
+++ b/src/util/amount.rs
@@ -215,7 +215,7 @@ fn parse_signed_to_satoshi(
 fn fmt_satoshi_in(
     satoshi: u64,
     negative: bool,
-    f: &mut fmt::Write,
+    f: &mut dyn fmt::Write,
     denom: Denomination,
 ) -> fmt::Result {
     if negative {
@@ -365,7 +365,7 @@ impl Amount {
     /// Format the value of this [Amount] in the given denomination.
     ///
     /// Does not include the denomination.
-    pub fn fmt_value_in(self, f: &mut fmt::Write, denom: Denomination) -> fmt::Result {
+    pub fn fmt_value_in(self, f: &mut dyn fmt::Write, denom: Denomination) -> fmt::Result {
         fmt_satoshi_in(self.as_sat(), false, f, denom)
     }
 
@@ -643,7 +643,7 @@ impl SignedAmount {
     /// Format the value of this [SignedAmount] in the given denomination.
     ///
     /// Does not include the denomination.
-    pub fn fmt_value_in(self, f: &mut fmt::Write, denom: Denomination) -> fmt::Result {
+    pub fn fmt_value_in(self, f: &mut dyn fmt::Write, denom: Denomination) -> fmt::Result {
         let sats = self.as_sat().checked_abs().map(|a: i64| a as u64).unwrap_or_else(|| {
             // We could also hard code this into `9223372036854775808`
             u64::max_value() - self.as_sat() as u64 +1
diff --git a/src/util/bip158.rs b/src/util/bip158.rs
index 26381345..76e62887 100644
--- a/src/util/bip158.rs
+++ b/src/util/bip158.rs
@@ -133,13 +133,13 @@ impl BlockFilter {
     }
 
     /// match any query pattern
-    pub fn match_any(&self, block_hash: &BlockHash, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_any(&self, block_hash: &BlockHash, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         let filter_reader = BlockFilterReader::new(block_hash);
         filter_reader.match_any(&mut Cursor::new(self.content.as_slice()), query)
     }
 
     /// match all query pattern
-    pub fn match_all(&self, block_hash: &BlockHash, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_all(&self, block_hash: &BlockHash, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         let filter_reader = BlockFilterReader::new(block_hash);
         filter_reader.match_all(&mut Cursor::new(self.content.as_slice()), query)
     }
@@ -153,7 +153,7 @@ pub struct BlockFilterWriter<'a> {
 
 impl<'a> BlockFilterWriter<'a> {
     /// Create a block filter writer
-    pub fn new(writer: &'a mut io::Write, block: &'a Block) -> BlockFilterWriter<'a> {
+    pub fn new(writer: &'a mut dyn io::Write, block: &'a Block) -> BlockFilterWriter<'a> {
         let block_hash_as_int = block.block_hash().into_inner();
         let k0 = endian::slice_to_u64_le(&block_hash_as_int[0..8]);
         let k1 = endian::slice_to_u64_le(&block_hash_as_int[8..16]);
@@ -214,12 +214,12 @@ impl BlockFilterReader {
     }
 
     /// match any query pattern
-    pub fn match_any(&self, reader: &mut io::Read, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_any(&self, reader: &mut dyn io::Read, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         self.reader.match_any(reader, query)
     }
 
     /// match all query pattern
-    pub fn match_all(&self, reader: &mut io::Read, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_all(&self, reader: &mut dyn io::Read, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         self.reader.match_all(reader, query)
     }
 }
@@ -238,7 +238,7 @@ impl GCSFilterReader {
     }
 
     /// match any query pattern
-    pub fn match_any(&self, reader: &mut io::Read, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_any(&self, reader: &mut dyn io::Read, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         let mut decoder = reader;
         let n_elements: VarInt = Decodable::consensus_decode(&mut decoder).unwrap_or(VarInt(0));
         let reader = &mut decoder;
@@ -278,7 +278,7 @@ impl GCSFilterReader {
     }
 
     /// match all query pattern
-    pub fn match_all(&self, reader: &mut io::Read, query: &mut Iterator<Item=&[u8]>) -> Result<bool, Error> {
+    pub fn match_all(&self, reader: &mut dyn io::Read, query: &mut dyn Iterator<Item=&[u8]>) -> Result<bool, Error> {
         let mut decoder = reader;
         let n_elements: VarInt = Decodable::consensus_decode(&mut decoder).unwrap_or(VarInt(0));
         let reader = &mut decoder;
@@ -340,14 +340,14 @@ fn map_to_range(hash: u64, nm: u64) -> u64 {
 /// Colomb-Rice encoded filter writer
 pub struct GCSFilterWriter<'a> {
     filter: GCSFilter,
-    writer: &'a mut io::Write,
+    writer: &'a mut dyn io::Write,
     elements: HashSet<Vec<u8>>,
     m: u64
 }
 
 impl<'a> GCSFilterWriter<'a> {
     /// Create a new GCS writer wrapping a generic writer, with specific seed to siphash
-    pub fn new(writer: &'a mut io::Write, k0: u64, k1: u64, m: u64, p: u8) -> GCSFilterWriter<'a> {
+    pub fn new(writer: &'a mut dyn io::Write, k0: u64, k1: u64, m: u64, p: u8) -> GCSFilterWriter<'a> {
         GCSFilterWriter {
             filter: GCSFilter::new(k0, k1, p),
             writer,
@@ -436,12 +436,12 @@ impl GCSFilter {
 pub struct BitStreamReader<'a> {
     buffer: [u8; 1],
     offset: u8,
-    reader: &'a mut io::Read,
+    reader: &'a mut dyn io::Read,
 }
 
 impl<'a> BitStreamReader<'a> {
     /// Create a new BitStreamReader that reads bitwise from a given reader
-    pub fn new(reader: &'a mut io::Read) -> BitStreamReader {
+    pub fn new(reader: &'a mut dyn io::Read) -> BitStreamReader {
         BitStreamReader {
             buffer: [0u8],
             reader: reader,
@@ -474,12 +474,12 @@ impl<'a> BitStreamReader<'a> {
 pub struct BitStreamWriter<'a> {
     buffer: [u8; 1],
     offset: u8,
-    writer: &'a mut io::Write,
+    writer: &'a mut dyn io::Write,
 }
 
 impl<'a> BitStreamWriter<'a> {
     /// Create a new BitStreamWriter that writes bitwise to a given writer
-    pub fn new(writer: &'a mut io::Write) -> BitStreamWriter {
+    pub fn new(writer: &'a mut dyn io::Write) -> BitStreamWriter {
         BitStreamWriter {
             buffer: [0u8],
             writer: writer,
diff --git a/src/util/bip32.rs b/src/util/bip32.rs
index e1815e03..8d6dcf50 100644
--- a/src/util/bip32.rs
+++ b/src/util/bip32.rs
@@ -404,7 +404,7 @@ impl fmt::Display for Error {
 }
 
 impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
        if let Error::Ecdsa(ref e) = *self {
            Some(e)
        } else {
diff --git a/src/util/contracthash.rs b/src/util/contracthash.rs
index fa893f2d..cc53a817 100644
--- a/src/util/contracthash.rs
+++ b/src/util/contracthash.rs
@@ -73,7 +73,7 @@ impl fmt::Display for Error {
 
 #[allow(deprecated)]
 impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Secp(ref e) => Some(e),
             Error::Script(ref e) => Some(e),
diff --git a/src/util/key.rs b/src/util/key.rs
index f36c206d..83b56965 100644
--- a/src/util/key.rs
+++ b/src/util/key.rs
@@ -46,7 +46,7 @@ impl fmt::Display for Error {
 }
 
 impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Base58(ref e) => Some(e),
             Error::Secp256k1(ref e) => Some(e),
@@ -193,7 +193,7 @@ impl PrivateKey {
     }
 
     /// Format the private key to WIF format.
-    pub fn fmt_wif(&self, fmt: &mut fmt::Write) -> fmt::Result {
+    pub fn fmt_wif(&self, fmt: &mut dyn fmt::Write) -> fmt::Result {
         let mut ret = [0; 34];
         ret[0] = match self.network {
             Network::Bitcoin => 128,
diff --git a/src/util/mod.rs b/src/util/mod.rs
index 856757d8..523c4377 100644
--- a/src/util/mod.rs
+++ b/src/util/mod.rs
@@ -85,7 +85,7 @@ impl fmt::Display for Error {
 
 #[allow(deprecated)]
 impl error::Error for Error {
-    fn cause(&self) -> Option<&error::Error> {
+    fn cause(&self) -> Option<&dyn error::Error> {
         match *self {
             Error::Encode(ref e) => Some(e),
             Error::Network(ref e) => Some(e),