diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1a4701e4bb..f9bace4514 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -79,6 +79,7 @@ workflows:
       - contract_crypto_verify
       - contract_cyberpunk
       - contract_empty
+      - contract_replier
       # - contract_floaty # This contract needs nightly Rust to compile
       - contract_hackatom
       - contract_ibc_callbacks
@@ -597,6 +598,34 @@ jobs:
             - target/wasm32-unknown-unknown/release/deps
           key: cargocache-v2-contract_burner-rust:1.74-{{ checksum "Cargo.lock" }}
 
+  contract_replier:
+    docker:
+      - image: rust:1.74
+    environment:
+      RUST_BACKTRACE: 1
+    working_directory: ~/cosmwasm/contracts/replier
+    steps:
+      - checkout:
+          path: ~/cosmwasm
+      - run:
+          name: Version information
+          command: rustc --version; cargo --version; rustup --version
+      - restore_cache:
+          keys:
+            - cargocache-v2-contract_replier-rust:1.74-{{ checksum "Cargo.lock" }}
+      - check_contract:
+          min_version: "1.4"
+      - save_cache:
+          paths:
+            - /usr/local/cargo/registry
+            - target/debug/.fingerprint
+            - target/debug/build
+            - target/debug/deps
+            - target/wasm32-unknown-unknown/release/.fingerprint
+            - target/wasm32-unknown-unknown/release/build
+            - target/wasm32-unknown-unknown/release/deps
+          key: cargocache-v2-contract_replier-rust:1.74-{{ checksum "Cargo.lock" }}
+
   contract_crypto_verify:
     docker:
       - image: rust:1.74
diff --git a/contracts/replier/Cargo.toml b/contracts/replier/Cargo.toml
index c7934cbbcd..3759758dc4 100644
--- a/contracts/replier/Cargo.toml
+++ b/contracts/replier/Cargo.toml
@@ -25,8 +25,8 @@ overflow-checks = true
 [dependencies]
 cosmwasm-schema = { path = "../../packages/schema" }
 cosmwasm-std = { path = "../../packages/std", default-features = false, features = [
-    "abort",
-    "cosmwasm_2_2",
+    "cosmwasm_1_4",
+    "iterator",
     "std",
 ] }
 schemars = "0.8.12"
diff --git a/contracts/replier/src/lib.rs b/contracts/replier/src/lib.rs
index 2282b674b8..e830860261 100644
--- a/contracts/replier/src/lib.rs
+++ b/contracts/replier/src/lib.rs
@@ -6,6 +6,10 @@ use cosmwasm_std::{
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
+const SET_DATA_IN_EXEC_AND_REPLY_FLAG: u64 = 0x100;
+const RETURN_OERDER_IN_REPLY_FLAG: u64 = 0x200;
+const REPLY_ERROR_FLAG: u64 = 0x400;
+
 #[cw_serde]
 pub struct InstantiateMsg {}
 
@@ -78,13 +82,13 @@ pub fn execute(
         };
         let mut msg_id: u64 = msg.msg_id.into();
         if msg.set_data_in_exec_and_reply {
-            msg_id = msg_id | 0x100;
+            msg_id |= SET_DATA_IN_EXEC_AND_REPLY_FLAG;
         }
         if msg.return_order_in_reply {
-            msg_id = msg_id | 0x200;
+            msg_id |= RETURN_OERDER_IN_REPLY_FLAG;
         }
         if msg.reply_error {
-            msg_id = msg_id | 0x400;
+            msg_id |= REPLY_ERROR_FLAG;
         }
 
         let submsg = SubMsg {
@@ -111,9 +115,9 @@ pub fn query(_deps: Deps, _env: Env, _msg: QueryMsg) -> StdResult<QueryResponse>
 #[entry_point]
 pub fn reply(deps: DepsMut, _env: Env, msg: Reply) -> StdResult<Response> {
     let msg_id = msg.id & 0xFF;
-    let should_set_data = msg.id & 0x100 != 0;
-    let should_set_order = msg.id & 0x200 != 0;
-    let should_return_error = msg.id & 0x400 != 0;
+    let should_set_data = msg.id & SET_DATA_IN_EXEC_AND_REPLY_FLAG != 0;
+    let should_set_order = msg.id & RETURN_OERDER_IN_REPLY_FLAG != 0;
+    let should_return_error = msg.id & REPLY_ERROR_FLAG != 0;
 
     let data = deps.storage.get(CONFIG_KEY).unwrap();
     let mut config: State = from_json(data)?;
@@ -140,9 +144,8 @@ pub fn reply(deps: DepsMut, _env: Env, msg: Reply) -> StdResult<Response> {
             result
                 .msg_responses
                 .into_iter()
-                .map(|resp| resp.value.as_slice().to_vec())
-                .flatten()
-                .chain([0xBB, msg_id as u8].into_iter())
+                .flat_map(|resp| resp.value.as_slice().to_vec())
+                .chain([0xBB, msg_id as u8])
                 .collect(),
         )))
     } else {
diff --git a/contracts/replier/tests/integration.rs b/contracts/replier/tests/integration.rs
new file mode 100644
index 0000000000..8b13789179
--- /dev/null
+++ b/contracts/replier/tests/integration.rs
@@ -0,0 +1 @@
+