diff --git a/.github/workflows/cosmos-sdk-proto.yml b/.github/workflows/cosmos-sdk-proto.yml
index 2daf4fc7..ddadf482 100644
--- a/.github/workflows/cosmos-sdk-proto.yml
+++ b/.github/workflows/cosmos-sdk-proto.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.57.0 # MSRV
+          - 1.59.0 # MSRV
           - stable
         target:
           - x86_64-unknown-linux-gnu
@@ -43,7 +43,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.57.0 # MSRV
+          - 1.59.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v1
diff --git a/.github/workflows/cosmrs.yml b/.github/workflows/cosmrs.yml
index 651f2313..d6d85f48 100644
--- a/.github/workflows/cosmrs.yml
+++ b/.github/workflows/cosmrs.yml
@@ -24,7 +24,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.57.0 # MSRV
+          - 1.59.0 # MSRV
           - stable
         target:
           - x86_64-unknown-linux-gnu
@@ -44,7 +44,7 @@ jobs:
     strategy:
       matrix:
         rust:
-          - 1.57.0 # MSRV
+          - 1.59.0 # MSRV
           - stable
     steps:
       - uses: actions/checkout@v1
diff --git a/.github/workflows/rebuild-protos.yml b/.github/workflows/rebuild-protos.yml
index da8c31f3..bedc94bf 100644
--- a/.github/workflows/rebuild-protos.yml
+++ b/.github/workflows/rebuild-protos.yml
@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.57.0 # MSRV
+          toolchain: 1.59.0 # MSRV
           components: rustfmt
           override: true
           profile: minimal
diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index f0e6f0ec..475b3eb0 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -20,7 +20,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.57.0 # MSRV
+          toolchain: stable
           components: rustfmt
           override: true
           profile: minimal
@@ -35,7 +35,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.57.0 # MSRV
+          toolchain: 1.59.0
           components: clippy
           override: true
           profile: minimal
diff --git a/README.md b/README.md
index 803fc532..1ce34b47 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ all other crates, simply make the required edits in [main.rs](proto-build/main.r
 
 ## Minimum Supported Rust Version
 
-Rust **1.57**
+Rust **1.59**
 
 [//]: # "crates"
 
diff --git a/cosmos-sdk-proto/Cargo.toml b/cosmos-sdk-proto/Cargo.toml
index f5bd70fd..ee7282eb 100644
--- a/cosmos-sdk-proto/Cargo.toml
+++ b/cosmos-sdk-proto/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cosmos-sdk-proto"
-version = "0.14.0"
+version = "0.15.0-pre"
 authors = [
     "Justin Kilpatrick <justin@althea.net>",
     "Greg Szabo <greg@informal.systems>",
@@ -13,12 +13,12 @@ readme = "README.md"
 categories = ["cryptography", "cryptography::cryptocurrencies", "database"]
 keywords = ["blockchain", "cosmos", "tendermint", "proto"]
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.59"
 
 [dependencies]
 prost = "0.11"
 prost-types = "0.11"
-tendermint-proto = "=0.23.9"
+tendermint-proto = "0.26"
 
 # Optional dependencies
 tonic = { version = "0.8", optional = true, default-features = false, features = ["codegen", "prost"] }
diff --git a/cosmos-sdk-proto/README.md b/cosmos-sdk-proto/README.md
index cb6011b1..0af8bc21 100644
--- a/cosmos-sdk-proto/README.md
+++ b/cosmos-sdk-proto/README.md
@@ -20,7 +20,7 @@ Pull requests to expand coverage are welcome.
 
 ## Minimum Supported Rust Version
 
-This crate is supported on Rust **1.57** or newer.
+This crate is supported on Rust **1.59** or newer.
 
 [//]: # "badges"
 [crate-image]: https://buildstats.info/crate/cosmos-sdk-proto
@@ -31,7 +31,7 @@ This crate is supported on Rust **1.57** or newer.
 [build-link]: https://github.com/cosmos/cosmos-rust/actions/workflows/cosmos-sdk-proto.yml
 [license-image]: https://img.shields.io/badge/license-Apache2.0-blue.svg
 [license-link]: https://github.com/cosmos/cosmos-rust/blob/master/LICENSE
-[rustc-image]: https://img.shields.io/badge/rustc-1.57+-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.59+-blue.svg
 
 [//]: # "links"
 [Protobufs]: (https://github.com/cosmos/cosmos-sdk/tree/master/proto/)
diff --git a/cosmrs/Cargo.toml b/cosmrs/Cargo.toml
index f6f071d2..0133fa0d 100644
--- a/cosmrs/Cargo.toml
+++ b/cosmrs/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cosmrs"
-version = "0.9.0"
+version = "0.10.0-pre"
 authors = ["Tony Arcieri <tony@iqlusion.io>"]
 license = "Apache-2.0"
 repository = "https://github.com/cosmos/cosmos-rust/tree/main/cosmrs"
@@ -9,10 +9,10 @@ readme = "README.md"
 categories = ["cryptography", "cryptography::cryptocurrencies", "encoding"]
 keywords = ["blockchain", "cosmos", "tendermint", "transaction"]
 edition = "2021"
-rust-version = "1.57"
+rust-version = "1.59"
 
 [dependencies]
-cosmos-sdk-proto = { version = "0.14", default-features = false, path = "../cosmos-sdk-proto" }
+cosmos-sdk-proto = { version = "=0.15.0-pre", default-features = false, path = "../cosmos-sdk-proto" }
 ecdsa = { version = "0.14", features = ["std"] }
 eyre = "0.6"
 k256 = { version = "0.11", features = ["ecdsa", "sha256"] }
@@ -20,12 +20,12 @@ rand_core = { version = "0.6", features = ["std"] }
 serde = { version = "1", features = ["serde_derive"] }
 serde_json = "1"
 subtle-encoding = { version = "0.5", features = ["bech32-preview"] }
-tendermint = { version = "=0.23.9", features = ["secp256k1"] }
+tendermint = { version = "0.26", features = ["secp256k1"] }
 thiserror = "1"
 
 # optional dependencies
 bip32 = { version = "0.4", optional = true }
-tendermint-rpc = { version = "=0.23.9", optional = true, features = ["http-client"] }
+tendermint-rpc = { version = "0.26", optional = true, features = ["http-client"] }
 tokio = { version = "1", optional = true }
 
 [target.'cfg(target_arch = "wasm32")'.dependencies]
diff --git a/cosmrs/README.md b/cosmrs/README.md
index 6de3a287..bb47451a 100644
--- a/cosmrs/README.md
+++ b/cosmrs/README.md
@@ -30,7 +30,7 @@ and message passing.
 
 ## Minimum Supported Rust Version
 
-This crate is supported on Rust **1.57** or newer.
+This crate is supported on Rust **1.59** or newer.
 
 [//]: # "badges"
 [crate-image]: https://buildstats.info/crate/cosmrs
@@ -41,7 +41,7 @@ This crate is supported on Rust **1.57** or newer.
 [build-link]: https://github.com/cosmos/cosmos-rust/actions/workflows/cosmrs.yml
 [license-image]: https://img.shields.io/badge/license-Apache2.0-blue.svg
 [license-link]: https://github.com/cosmos/cosmos-rust/blob/master/LICENSE
-[rustc-image]: https://img.shields.io/badge/rustc-1.57+-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.59+-blue.svg
 
 [//]: # "general links"
 [Cosmos]: https://cosmos.network/
diff --git a/cosmrs/src/abci.rs b/cosmrs/src/abci.rs
index 79b5af85..4b6e7411 100644
--- a/cosmrs/src/abci.rs
+++ b/cosmrs/src/abci.rs
@@ -1,12 +1,14 @@
 //! Abci-related functionality
 
-use crate::tx::Msg;
 use crate::{
     proto::{self, traits::Message},
-    ErrorReport, Result,
+    tx::Msg,
+    ErrorReport, Gas, Result,
 };
 use serde::{Deserialize, Serialize};
-use tendermint::abci::Gas;
+
+/// Transaction data.
+pub type Data = Vec<u8>;
 
 /// MsgData defines the data returned in a Result object during message execution.
 #[derive(Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
@@ -61,12 +63,11 @@ pub struct TxMsgData {
     pub data: Vec<MsgData>,
 }
 
-impl TryFrom<tendermint::abci::Data> for TxMsgData {
+impl TryFrom<Data> for TxMsgData {
     type Error = ErrorReport;
 
-    fn try_from(data: tendermint::abci::Data) -> Result<TxMsgData> {
-        let proto = proto::cosmos::base::abci::v1beta1::TxMsgData::decode(data.value().as_ref())?;
-        proto.try_into()
+    fn try_from(data: Data) -> Result<TxMsgData> {
+        proto::cosmos::base::abci::v1beta1::TxMsgData::decode(data.as_ref())?.try_into()
     }
 }
 
@@ -111,8 +112,8 @@ impl TryFrom<proto::cosmos::base::abci::v1beta1::GasInfo> for GasInfo {
 
     fn try_from(proto: proto::cosmos::base::abci::v1beta1::GasInfo) -> Result<GasInfo> {
         Ok(GasInfo {
-            gas_wanted: Gas::from(proto.gas_wanted),
-            gas_used: Gas::from(proto.gas_used),
+            gas_wanted: proto.gas_wanted,
+            gas_used: proto.gas_used,
         })
     }
 }
@@ -120,8 +121,8 @@ impl TryFrom<proto::cosmos::base::abci::v1beta1::GasInfo> for GasInfo {
 impl From<GasInfo> for proto::cosmos::base::abci::v1beta1::GasInfo {
     fn from(info: GasInfo) -> Self {
         proto::cosmos::base::abci::v1beta1::GasInfo {
-            gas_wanted: info.gas_wanted.value(),
-            gas_used: info.gas_wanted.value(),
+            gas_wanted: info.gas_wanted,
+            gas_used: info.gas_wanted,
         }
     }
 }
diff --git a/cosmrs/src/base.rs b/cosmrs/src/base.rs
index 91258a5a..362fdfa2 100644
--- a/cosmrs/src/base.rs
+++ b/cosmrs/src/base.rs
@@ -126,6 +126,9 @@ impl Serialize for AccountId {
     }
 }
 
+/// Amounts.
+pub type Amount = u128;
+
 /// Coin defines a token with a denomination and an amount.
 #[derive(Serialize, Deserialize, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
 pub struct Coin {
@@ -133,12 +136,12 @@ pub struct Coin {
     pub denom: Denom,
 
     /// Amount
-    pub amount: u128,
+    pub amount: Amount,
 }
 
 impl Coin {
     /// Constructor
-    pub fn new(amount: u128, denom: &str) -> Result<Self> {
+    pub fn new(amount: Amount, denom: &str) -> Result<Self> {
         Ok(Coin {
             amount,
             denom: denom.parse()?,
@@ -232,6 +235,9 @@ impl Serialize for Denom {
     }
 }
 
+/// Gas cost.
+pub type Gas = u64;
+
 #[cfg(test)]
 mod tests {
     use super::{AccountId, Coin, Denom};
diff --git a/cosmrs/src/dev.rs b/cosmrs/src/dev.rs
index c67ed231..e36c993a 100644
--- a/cosmrs/src/dev.rs
+++ b/cosmrs/src/dev.rs
@@ -10,6 +10,7 @@ use crate::{
     tx::{self, Tx},
 };
 use std::{ffi::OsStr, panic, process, str, time::Duration};
+use tendermint_rpc::abci::transaction::Hash;
 use tokio::time;
 
 /// Docker image (on Docker Hub) containing a single-node test environment for
@@ -101,9 +102,13 @@ pub async fn poll_for_first_block(rpc_client: &rpc::HttpClient) {
 }
 
 /// Wait for a transaction with the given hash to appear in the blockchain
-pub async fn poll_for_tx(rpc_client: &rpc::HttpClient, tx_hash: tx::Hash) -> Tx {
+pub async fn poll_for_tx(rpc_client: &rpc::HttpClient, tx_hash: Hash) -> Tx {
     let attempts = 5;
 
+    // TODO(tarcieri): better conversion or unified `Hash` type, see tendermint-rs#1221
+    #[allow(clippy::unwrap_used)]
+    let tx_hash = tx::Hash::Sha256(tx_hash.as_ref().try_into().unwrap());
+
     for _ in 0..attempts {
         // TODO(tarcieri): handle not found errors
         if let Ok(tx) = Tx::find_by_hash(rpc_client, tx_hash).await {
diff --git a/cosmrs/src/lib.rs b/cosmrs/src/lib.rs
index 6f7e077d..b2571c73 100644
--- a/cosmrs/src/lib.rs
+++ b/cosmrs/src/lib.rs
@@ -47,7 +47,7 @@ mod base;
 mod error;
 
 pub use crate::{
-    base::{AccountId, Coin, Denom},
+    base::{AccountId, Amount, Coin, Denom, Gas},
     error::{Error, Result},
     tx::Tx,
 };
diff --git a/cosmrs/src/tx.rs b/cosmrs/src/tx.rs
index ae30e0d9..de60fb95 100644
--- a/cosmrs/src/tx.rs
+++ b/cosmrs/src/tx.rs
@@ -63,7 +63,7 @@
 //! let chain_id = "cosmoshub-4".parse()?;
 //! let account_number = 1;
 //! let sequence_number = 0;
-//! let gas = 100_000;
+//! let gas = 100_000u64;
 //! let timeout_height = 9001u16;
 //! let memo = "example memo";
 //!
@@ -128,11 +128,11 @@ pub use crate::{
     proto::{cosmos::tx::signing::v1beta1::SignMode, traits::MessageExt},
     ErrorReport,
 };
-pub use tendermint::abci::{transaction::Hash, Gas};
+pub use tendermint::Hash;
 
 use crate::{
     proto::{self, traits::Message},
-    Error, Result,
+    Error, Gas, Result,
 };
 
 #[cfg(feature = "rpc")]
@@ -178,6 +178,12 @@ impl Tx {
     where
         C: rpc::Client + Send + Sync,
     {
+        // TODO(tarcieri): better conversion or unified `Hash` type, see tendermint-rs#1221
+        let tx_hash = match tx_hash {
+            Hash::Sha256(bytes) => tendermint_rpc::abci::transaction::Hash::new(bytes),
+            _ => return Err(Error::Crypto.into()),
+        };
+
         let response = rpc_client.tx(tx_hash, false).await?;
         Tx::from_bytes(response.tx.as_bytes())
     }
diff --git a/cosmrs/src/tx/fee.rs b/cosmrs/src/tx/fee.rs
index d13fb411..78a3d27c 100644
--- a/cosmrs/src/tx/fee.rs
+++ b/cosmrs/src/tx/fee.rs
@@ -72,7 +72,7 @@ impl TryFrom<&proto::cosmos::tx::v1beta1::Fee> for Fee {
 
         Ok(Fee {
             amount,
-            gas_limit: proto.gas_limit.into(),
+            gas_limit: proto.gas_limit,
             payer: proto.payer.parse_optional()?,
             granter: proto.granter.parse_optional()?,
         })
@@ -89,7 +89,7 @@ impl From<&Fee> for proto::cosmos::tx::v1beta1::Fee {
     fn from(fee: &Fee) -> proto::cosmos::tx::v1beta1::Fee {
         proto::cosmos::tx::v1beta1::Fee {
             amount: fee.amount.iter().map(Into::into).collect(),
-            gas_limit: fee.gas_limit.value(),
+            gas_limit: fee.gas_limit,
             payer: fee
                 .payer
                 .as_ref()
diff --git a/cosmrs/tests/integration.rs b/cosmrs/tests/integration.rs
index 71247762..b3723c70 100644
--- a/cosmrs/tests/integration.rs
+++ b/cosmrs/tests/integration.rs
@@ -58,7 +58,7 @@ fn msg_send() {
 
     let chain_id = CHAIN_ID.parse().unwrap();
     let sequence_number = 0;
-    let gas = 100_000;
+    let gas = 100_000u64;
     let fee = Fee::from_amount_and_gas(amount, gas);
 
     let tx_body = tx::BodyBuilder::new().msg(msg_send).memo(MEMO).finish();
diff --git a/rust-toolchain b/rust-toolchain
index 373aea97..bb120e87 100644
--- a/rust-toolchain
+++ b/rust-toolchain
@@ -1 +1 @@
-1.57.0
+1.59.0