diff --git a/contracts/ibc-reflect-send/src/ibc.rs b/contracts/ibc-reflect-send/src/ibc.rs
index 6faabd5c10..2a33b9aed6 100644
--- a/contracts/ibc-reflect-send/src/ibc.rs
+++ b/contracts/ibc-reflect-send/src/ibc.rs
@@ -1,7 +1,8 @@
 use cosmwasm_std::{
-    entry_point, from_json, to_json_binary, DepsMut, Env, IbcBasicResponse, IbcChannelCloseMsg,
-    IbcChannelConnectMsg, IbcChannelOpenMsg, IbcMsg, IbcOrder, IbcPacketAckMsg,
-    IbcPacketReceiveMsg, IbcPacketTimeoutMsg, IbcReceiveResponse, Never, StdError, StdResult,
+    entry_point, from_json, to_json_binary, DepsMut, Env, Ibc3ChannelOpenResponse,
+    IbcBasicResponse, IbcChannelCloseMsg, IbcChannelConnectMsg, IbcChannelOpenMsg,
+    IbcChannelOpenResponse, IbcMsg, IbcOrder, IbcPacketAckMsg, IbcPacketReceiveMsg,
+    IbcPacketTimeoutMsg, IbcReceiveResponse, Never, StdError, StdResult,
 };
 
 use crate::ibc_msg::{
@@ -17,7 +18,11 @@ pub const PACKET_LIFETIME: u64 = 60 * 60;
 
 #[entry_point]
 /// enforces ordering and versioing constraints
-pub fn ibc_channel_open(_deps: DepsMut, _env: Env, msg: IbcChannelOpenMsg) -> StdResult<()> {
+pub fn ibc_channel_open(
+    _deps: DepsMut,
+    _env: Env,
+    msg: IbcChannelOpenMsg,
+) -> StdResult<IbcChannelOpenResponse> {
     let channel = msg.channel();
 
     if channel.order != IbcOrder::Ordered {
@@ -37,7 +42,9 @@ pub fn ibc_channel_open(_deps: DepsMut, _env: Env, msg: IbcChannelOpenMsg) -> St
         }
     }
 
-    Ok(())
+    Ok(Some(Ibc3ChannelOpenResponse {
+        version: IBC_APP_VERSION.to_string(),
+    }))
 }
 
 #[entry_point]
diff --git a/contracts/ibc-reflect/Cargo.toml b/contracts/ibc-reflect/Cargo.toml
index ead27d3725..cd16b206e3 100644
--- a/contracts/ibc-reflect/Cargo.toml
+++ b/contracts/ibc-reflect/Cargo.toml
@@ -33,7 +33,7 @@ backtraces = ["cosmwasm-std/backtraces", "cosmwasm-vm/backtraces"]
 
 [dependencies]
 cosmwasm-schema = { path = "../../packages/schema" }
-cosmwasm-std = { path = "../../packages/std", features = ["iterator", "ibc3"] }
+cosmwasm-std = { path = "../../packages/std", features = ["iterator", "stargate"] }
 schemars = "0.8.3"
 serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 
diff --git a/docs/USING_COSMWASM_STD.md b/docs/USING_COSMWASM_STD.md
index 19a04bdb66..49cf3511d4 100644
--- a/docs/USING_COSMWASM_STD.md
+++ b/docs/USING_COSMWASM_STD.md
@@ -39,7 +39,6 @@ The libarary comes with the following features:
 | iterator     | x                  | Storage iterators                                                         |
 | abort        | x                  | A panic handler that aborts the contract execution with a helpful message |
 | stargate     |                    | Cosmos SDK 0.40+ features and IBC                                         |
-| ibc3         |                    | New fields added in IBC v3                                                |
 | staking      |                    | Access to the staking module                                              |
 | backtraces   |                    | Add backtraces to errors (for unit testing)                               |
 | cosmwasm_1_1 |                    | Features that require CosmWasm 1.1+ on the chain                          |
diff --git a/packages/go-gen/Cargo.toml b/packages/go-gen/Cargo.toml
index 99693a0c37..a432ce0821 100644
--- a/packages/go-gen/Cargo.toml
+++ b/packages/go-gen/Cargo.toml
@@ -9,7 +9,7 @@ publish = false
 
 [dependencies]
 schemars = "0.8.3"
-cosmwasm-std = { path = "../std", version = "1.4.0", features = ["cosmwasm_1_4", "staking", "stargate", "ibc3"] }
+cosmwasm-std = { path = "../std", version = "1.4.0", features = ["cosmwasm_1_4", "staking", "stargate"] }
 cosmwasm-schema = { path = "../schema", version = "1.4.0" }
 anyhow = "1"
 Inflector = "0.11.4"
diff --git a/packages/std/Cargo.toml b/packages/std/Cargo.toml
index 323b73b70c..94246b2096 100644
--- a/packages/std/Cargo.toml
+++ b/packages/std/Cargo.toml
@@ -9,7 +9,7 @@ license = "Apache-2.0"
 readme = "README.md"
 
 [package.metadata.docs.rs]
-features = ["abort", "stargate", "staking", "ibc3", "cosmwasm_1_3"]
+features = ["abort", "stargate", "staking", "cosmwasm_1_3"]
 
 [features]
 default = ["iterator", "abort"]
@@ -30,9 +30,6 @@ backtraces = []
 # stargate enables stargate-dependent messages and queries, like raw protobuf messages
 # as well as ibc-related functionality
 stargate = []
-# ibc3 extends ibc messages with ibc-v3 only features. This should only be enabled on contracts
-# that require these types. Without this, they get the smaller ibc-v1 API.
-ibc3 = ["stargate"]
 # This feature makes `BankQuery::Supply` available for the contract to call, but requires
 # the host blockchain to run CosmWasm `1.1.0` or higher.
 cosmwasm_1_1 = []
diff --git a/packages/std/src/exports.rs b/packages/std/src/exports.rs
index 279b9d8bb3..9cbd92fb8e 100644
--- a/packages/std/src/exports.rs
+++ b/packages/std/src/exports.rs
@@ -15,9 +15,10 @@ use serde::de::DeserializeOwned;
 use crate::deps::OwnedDeps;
 #[cfg(feature = "stargate")]
 use crate::ibc::{
-    IbcBasicResponse, IbcChannelCloseMsg, IbcChannelConnectMsg, IbcChannelOpenMsg, IbcPacketAckMsg,
+    IbcBasicResponse, IbcChannelCloseMsg, IbcChannelConnectMsg, IbcPacketAckMsg,
     IbcPacketReceiveMsg, IbcPacketTimeoutMsg, IbcReceiveResponse,
 };
+use crate::ibc::{IbcChannelOpenMsg, IbcChannelOpenResponse};
 use crate::imports::{ExternalApi, ExternalQuerier, ExternalStorage};
 use crate::memory::{alloc, consume_region, release_buffer, Region};
 #[cfg(feature = "abort")]
@@ -528,12 +529,11 @@ where
     query_fn(deps.as_ref(), env, msg).into()
 }
 
-#[cfg(feature = "stargate")]
 fn _do_ibc_channel_open<Q, E>(
-    contract_fn: &dyn Fn(DepsMut<Q>, Env, IbcChannelOpenMsg) -> Result<(), E>,
+    contract_fn: &dyn Fn(DepsMut<Q>, Env, IbcChannelOpenMsg) -> Result<IbcChannelOpenResponse, E>,
     env_ptr: *mut Region,
     msg_ptr: *mut Region,
-) -> ContractResult<()>
+) -> ContractResult<IbcChannelOpenResponse>
 where
     Q: CustomQuery,
     E: ToString,
diff --git a/packages/std/src/ibc.rs b/packages/std/src/ibc.rs
index e66655bf47..a77a57a0f1 100644
--- a/packages/std/src/ibc.rs
+++ b/packages/std/src/ibc.rs
@@ -5,7 +5,6 @@ use core::cmp::{Ord, Ordering, PartialOrd};
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
-#[cfg(feature = "ibc3")]
 use crate::addresses::Addr;
 use crate::binary::Binary;
 use crate::coin::Coin;
@@ -298,7 +297,6 @@ impl From<IbcChannelOpenMsg> for IbcChannel {
 }
 
 /// This serializes either as "null" or a JSON object.
-#[cfg(feature = "ibc3")]
 pub type IbcChannelOpenResponse = Option<Ibc3ChannelOpenResponse>;
 
 #[derive(Serialize, Deserialize, Clone, Debug, PartialEq, Eq, JsonSchema)]
@@ -400,12 +398,10 @@ impl From<IbcChannelCloseMsg> for IbcChannel {
 #[non_exhaustive]
 pub struct IbcPacketReceiveMsg {
     pub packet: IbcPacket,
-    #[cfg(feature = "ibc3")]
     pub relayer: Addr,
 }
 
 impl IbcPacketReceiveMsg {
-    #[cfg(feature = "ibc3")]
     pub fn new(packet: IbcPacket, relayer: Addr) -> Self {
         Self { packet, relayer }
     }
@@ -417,12 +413,10 @@ impl IbcPacketReceiveMsg {
 pub struct IbcPacketAckMsg {
     pub acknowledgement: IbcAcknowledgement,
     pub original_packet: IbcPacket,
-    #[cfg(feature = "ibc3")]
     pub relayer: Addr,
 }
 
 impl IbcPacketAckMsg {
-    #[cfg(feature = "ibc3")]
     pub fn new(
         acknowledgement: IbcAcknowledgement,
         original_packet: IbcPacket,
@@ -441,12 +435,10 @@ impl IbcPacketAckMsg {
 #[non_exhaustive]
 pub struct IbcPacketTimeoutMsg {
     pub packet: IbcPacket,
-    #[cfg(feature = "ibc3")]
     pub relayer: Addr,
 }
 
 impl IbcPacketTimeoutMsg {
-    #[cfg(feature = "ibc3")]
     pub fn new(packet: IbcPacket, relayer: Addr) -> Self {
         Self { packet, relayer }
     }
diff --git a/packages/std/src/lib.rs b/packages/std/src/lib.rs
index a2819f5f1e..0d49f1d5dd 100644
--- a/packages/std/src/lib.rs
+++ b/packages/std/src/lib.rs
@@ -51,7 +51,6 @@ pub use crate::errors::{
     VerificationError,
 };
 pub use crate::hex_binary::HexBinary;
-#[cfg(feature = "ibc3")]
 pub use crate::ibc::IbcChannelOpenResponse;
 pub use crate::ibc::{
     Ibc3ChannelOpenResponse, IbcAcknowledgement, IbcBasicResponse, IbcChannel, IbcChannelCloseMsg,
diff --git a/packages/std/src/testing/mock.rs b/packages/std/src/testing/mock.rs
index d19e384d09..2b17a05297 100644
--- a/packages/std/src/testing/mock.rs
+++ b/packages/std/src/testing/mock.rs
@@ -3,7 +3,7 @@ use core::marker::PhantomData;
 #[cfg(feature = "cosmwasm_1_3")]
 use core::ops::Bound;
 use serde::de::DeserializeOwned;
-#[cfg(feature = "ibc3")]
+#[cfg(feature = "stargate")]
 use serde::Serialize;
 #[cfg(feature = "cosmwasm_1_3")]
 use std::collections::BTreeSet;
@@ -14,7 +14,7 @@ use crate::binary::Binary;
 use crate::coin::Coin;
 use crate::deps::OwnedDeps;
 use crate::errors::{RecoverPubkeyError, StdError, StdResult, SystemError, VerificationError};
-#[cfg(feature = "ibc3")]
+#[cfg(feature = "stargate")]
 use crate::ibc::{
     IbcAcknowledgement, IbcPacket, IbcPacketAckMsg, IbcPacketReceiveMsg, IbcPacketTimeoutMsg,
     IbcTimeoutBlock,
@@ -356,7 +356,7 @@ pub fn mock_ibc_channel_close_confirm(
 
 /// Creates a IbcPacketReceiveMsg for testing ibc_packet_receive. You set a few key parameters that are
 /// often parsed. If you want to set more, use this as a default and mutate other fields
-#[cfg(feature = "ibc3")]
+#[cfg(feature = "stargate")]
 pub fn mock_ibc_packet_recv(
     my_channel_id: &str,
     data: &impl Serialize,
@@ -379,7 +379,6 @@ pub fn mock_ibc_packet_recv(
             }
             .into(),
         },
-        #[cfg(feature = "ibc3")]
         Addr::unchecked("relayer"),
     ))
 }
@@ -387,7 +386,7 @@ pub fn mock_ibc_packet_recv(
 /// Creates a IbcPacket for testing ibc_packet_{ack,timeout}. You set a few key parameters that are
 /// often parsed. If you want to set more, use this as a default and mutate other fields.
 /// The difference from mock_ibc_packet_recv is if `my_channel_id` is src or dest.
-#[cfg(feature = "ibc3")]
+#[cfg(feature = "stargate")]
 fn mock_ibc_packet(my_channel_id: &str, data: &impl Serialize) -> StdResult<IbcPacket> {
     Ok(IbcPacket {
         data: to_json_binary(data)?,
@@ -411,7 +410,7 @@ fn mock_ibc_packet(my_channel_id: &str, data: &impl Serialize) -> StdResult<IbcP
 /// Creates a IbcPacketAckMsg for testing ibc_packet_ack. You set a few key parameters that are
 /// often parsed. If you want to set more, use this as a default and mutate other fields.
 /// The difference from mock_ibc_packet_recv is if `my_channel_id` is src or dest.
-#[cfg(feature = "ibc3")]
+#[cfg(feature = "stargate")]
 pub fn mock_ibc_packet_ack(
     my_channel_id: &str,
     data: &impl Serialize,
@@ -422,15 +421,14 @@ pub fn mock_ibc_packet_ack(
     Ok(IbcPacketAckMsg::new(
         ack,
         packet,
-        #[cfg(feature = "ibc3")]
         Addr::unchecked("relayer"),
     ))
 }
 
 /// Creates a IbcPacketTimeoutMsg for testing ibc_packet_timeout. You set a few key parameters that are
 /// often parsed. If you want to set more, use this as a default and mutate other fields.
-/// The difference from mock_ibc_packet_recv is if `my_channel_id` is src or dest./
-#[cfg(feature = "ibc3")]
+/// The difference from mock_ibc_packet_recv is if `my_channel_id` is src or dest.
+#[cfg(feature = "stargate")]
 pub fn mock_ibc_packet_timeout(
     my_channel_id: &str,
     data: &impl Serialize,
diff --git a/packages/std/src/testing/mod.rs b/packages/std/src/testing/mod.rs
index 7977061e49..14b362ce42 100644
--- a/packages/std/src/testing/mod.rs
+++ b/packages/std/src/testing/mod.rs
@@ -24,8 +24,6 @@ pub use mock::{
 pub use mock::{
     mock_ibc_channel, mock_ibc_channel_close_confirm, mock_ibc_channel_close_init,
     mock_ibc_channel_connect_ack, mock_ibc_channel_connect_confirm, mock_ibc_channel_open_init,
-    mock_ibc_channel_open_try,
+    mock_ibc_channel_open_try, mock_ibc_packet_ack, mock_ibc_packet_recv, mock_ibc_packet_timeout,
 };
-#[cfg(feature = "ibc3")]
-pub use mock::{mock_ibc_packet_ack, mock_ibc_packet_recv, mock_ibc_packet_timeout};
 pub use shuffle::riffle_shuffle;
diff --git a/packages/vm/Cargo.toml b/packages/vm/Cargo.toml
index c9154d52d2..75d265dc5b 100644
--- a/packages/vm/Cargo.toml
+++ b/packages/vm/Cargo.toml
@@ -21,7 +21,7 @@ backtraces = []
 iterator = ["cosmwasm-std/iterator"]
 staking = ["cosmwasm-std/staking"]
 # this enables all stargate-related functionality, including the ibc entry points
-stargate = ["cosmwasm-std/stargate", "cosmwasm-std/ibc3"]
+stargate = ["cosmwasm-std/stargate"]
 # Use cranelift backend instead of singlepass. This is required for development on Windows.
 cranelift = ["wasmer/cranelift"]
 # It's a bit unclear if interface_version_7 (CosmWasm 0.16) contracts are fully compatible
diff --git a/packages/vm/src/calls.rs b/packages/vm/src/calls.rs
index 05501d2b31..013867bad1 100644
--- a/packages/vm/src/calls.rs
+++ b/packages/vm/src/calls.rs
@@ -825,7 +825,6 @@ mod tests {
         use crate::testing::{
             mock_env, mock_info, mock_instance, MockApi, MockQuerier, MockStorage,
         };
-        #[cfg(feature = "ibc3")]
         use cosmwasm_std::testing::mock_ibc_packet_timeout;
         use cosmwasm_std::testing::{
             mock_ibc_channel_close_init, mock_ibc_channel_connect_ack, mock_ibc_channel_open_init,