diff --git a/Cargo.lock b/Cargo.lock
index b1e7f048e72..89d1c6bb2a3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3771,7 +3771,9 @@ version = "2.0.0-rc.1.0"
 dependencies = [
  "iroha_crypto",
  "iroha_data_model",
+ "iroha_wasm_builder",
  "serde",
+ "toml",
 ]
 
 [[package]]
diff --git a/crates/iroha/tests/upgrade.rs b/crates/iroha/tests/upgrade.rs
index c6f2c04f995..bbf940e73ff 100644
--- a/crates/iroha/tests/upgrade.rs
+++ b/crates/iroha/tests/upgrade.rs
@@ -10,7 +10,7 @@ use iroha::{
 };
 use iroha_executor_data_model::permission::{domain::CanUnregisterDomain, Permission as _};
 use iroha_test_network::*;
-use iroha_test_samples::{load_sample_wasm, ALICE_ID, BOB_ID};
+use iroha_test_samples::{load_sample_wasm, load_wasm_build_profile, ALICE_ID, BOB_ID};
 use nonzero_ext::nonzero;
 
 const ADMIN_PUBLIC_KEY_MULTIHASH: &str =
@@ -389,6 +389,18 @@ fn define_custom_parameter() -> Result<()> {
 
 fn upgrade_executor(client: &Client, executor: impl AsRef<str>) -> Result<()> {
     let upgrade_executor = Upgrade::new(Executor::new(load_sample_wasm(executor)));
+    let profile = load_wasm_build_profile();
+
+    if !profile.is_optimized() {
+        client.submit_all_blocking::<InstructionBox>([
+            InstructionBox::SetParameter(SetParameter::new(
+                    Parameter::Executor(SmartContractParameter::Fuel(
+                        std::num::NonZeroU64::new(80_000_000_u64).expect("Fuel must be positive."),
+                    ))
+                ))
+        ])?;
+    }
+
     client.submit_blocking(upgrade_executor)?;
 
     Ok(())
diff --git a/crates/iroha_core/src/sumeragi/main_loop.rs b/crates/iroha_core/src/sumeragi/main_loop.rs
index e5b88bfa076..593ca69ef9a 100644
--- a/crates/iroha_core/src/sumeragi/main_loop.rs
+++ b/crates/iroha_core/src/sumeragi/main_loop.rs
@@ -262,8 +262,7 @@ impl Sumeragi {
                         }
                     };
 
-                    let mut errors = block.as_ref().errors().peekable();
-                    if errors.peek().is_some() {
+                    if block.as_ref().errors().next().is_some() {
                         error!("Genesis contains invalid transactions");
 
                         for error in block.as_ref().errors() {
diff --git a/crates/iroha_test_network/src/lib.rs b/crates/iroha_test_network/src/lib.rs
index 07cb412ffcd..107920ca55f 100644
--- a/crates/iroha_test_network/src/lib.rs
+++ b/crates/iroha_test_network/src/lib.rs
@@ -27,7 +27,7 @@ use iroha_crypto::{ExposedPrivateKey, KeyPair, PrivateKey};
 use iroha_data_model::{
     events::pipeline::BlockEventFilter,
     isi::InstructionBox,
-    parameter::{SmartContractParameter, SumeragiParameter, SumeragiParameters},
+    parameter::{SumeragiParameter, SumeragiParameters},
     ChainId,
 };
 use iroha_genesis::GenesisBlock;
@@ -340,13 +340,13 @@ impl NetworkBuilder {
         }
 
         // Unoptimized profile requires additional resources.
-        if cfg!(debug_assertions) {
-            extra_isi.push(InstructionBox::SetParameter(SetParameter::new(
-                Parameter::Executor(SmartContractParameter::Fuel(
-                    std::num::NonZeroU64::new(80000000).expect("Fuel must be positive."),
-                )),
-            )));
-        }
+        // if cfg!(debug_assertions) {
+        //     extra_isi.push(InstructionBox::SetParameter(SetParameter::new(
+        //         Parameter::Executor(SmartContractParameter::Fuel(
+        //             std::num::NonZeroU64::new(80000000).expect("Fuel must be positive."),
+        //         )),
+        //     )));
+        // }
 
         let genesis = config::genesis(
             [
diff --git a/crates/iroha_test_samples/Cargo.toml b/crates/iroha_test_samples/Cargo.toml
index c8d0d37192f..da4291c840f 100644
--- a/crates/iroha_test_samples/Cargo.toml
+++ b/crates/iroha_test_samples/Cargo.toml
@@ -16,8 +16,10 @@ categories.workspace = true
 [dependencies]
 iroha_crypto = { workspace = true }
 iroha_data_model = { workspace = true }
+iroha_wasm_builder = { workspace = true }
 
 serde = { workspace = true, features = ["derive"] }
+toml = { workspace = true }
 
 [lints]
 workspace = true
diff --git a/crates/iroha_test_samples/src/lib.rs b/crates/iroha_test_samples/src/lib.rs
index ed1d29e45b2..c781285be4c 100644
--- a/crates/iroha_test_samples/src/lib.rs
+++ b/crates/iroha_test_samples/src/lib.rs
@@ -8,6 +8,8 @@ use std::{
 
 use iroha_crypto::KeyPair;
 use iroha_data_model::prelude::{AccountId, WasmSmartContract};
+use iroha_wasm_builder::Profile;
+use std::fs;
 
 /// Generate [`AccountId`](iroha_data_model::account::AccountId) in the given `domain`.
 ///
@@ -96,6 +98,7 @@ fn read_file(path: impl AsRef<Path>) -> std::io::Result<Vec<u8>> {
 }
 
 const WASM_SAMPLES_PREBUILT_DIR: &str = "wasm/target/prebuilt/samples";
+const WASM_BUILD_CONFIG_PATH: &str = "wasm/target/prebuilt/build_config.toml";
 
 /// Load WASM smart contract from `wasm/samples` by the name of smart contract,
 /// e.g. `default_executor`.
@@ -126,3 +129,32 @@ pub fn load_sample_wasm(name: impl AsRef<str>) -> WasmSmartContract {
         Ok(blob) => WasmSmartContract::from_compiled(blob),
     }
 }
+
+/// Load WASM smart contract build profile
+///
+/// WASMs must be pre-built with the `build_wasm.sh` script
+pub fn load_wasm_build_profile() -> Profile {
+    let path = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .join("../../")
+        .canonicalize()
+        .expect("invoking from crates/iroha_test_samples, should be fine")
+        .join(WASM_BUILD_CONFIG_PATH);
+
+    match fs::read_to_string(&path) {
+        Err(err) => {
+            eprintln!(
+                "ERROR: Could not load WASM build configuration file from `{}`: {err}\n\
+                Make sure to run `build_wasm.sh` first.",
+                path.display(),
+            );
+            panic!("could not read WASM build profile");
+        }
+        Ok(content) => {
+            let parsed: toml::Value = toml::from_str(content.as_str()).expect("must parse config file");
+            let profile_str = parsed.get("profile")
+                            .and_then(toml::Value::as_str)
+                            .expect("profile must be present in config");
+            profile_str.parse().expect(format!("unrecognized profile {profile_str}").as_str())
+        }
+    }
+}
\ No newline at end of file
diff --git a/crates/iroha_wasm_builder/src/lib.rs b/crates/iroha_wasm_builder/src/lib.rs
index 38fc62acb63..498272c04c5 100644
--- a/crates/iroha_wasm_builder/src/lib.rs
+++ b/crates/iroha_wasm_builder/src/lib.rs
@@ -29,8 +29,8 @@ pub enum Profile {
 
 impl Profile {
     /// Checks whether profile uses optimizations from wasm-opt
-    pub fn is_optimized(profile: Self) -> bool {
-        return profile == Profile::Deploy;
+    pub fn is_optimized(self) -> bool {
+        return self == Profile::Deploy;
     }
 }
 
@@ -120,7 +120,7 @@ impl<'path, 'out_dir> Builder<'path, 'out_dir> {
     ///
     /// Will also return error if ran on workspace and not on the concrete package.
     pub fn build(self) -> Result<Output> {
-        let optimize = Profile::is_optimized(self.profile);
+        let optimize = self.profile.is_optimized();
         let output = self.into_internal()?.build()?;
         if optimize {
             output.optimize()
diff --git a/crates/iroha_wasm_builder/src/main.rs b/crates/iroha_wasm_builder/src/main.rs
index 3267d780176..4b4f97adfbd 100644
--- a/crates/iroha_wasm_builder/src/main.rs
+++ b/crates/iroha_wasm_builder/src/main.rs
@@ -60,7 +60,7 @@ fn main() -> color_eyre::Result<()> {
                 }
             };
 
-            let output = if Profile::is_optimized(profile) {
+            let output = if profile.is_optimized() {
                 let sp = if std::env::var("CI").is_err() {
                     Some(spinoff::Spinner::new_with_stream(
                         spinoff::spinners::Binary,
diff --git a/scripts/build_wasm.sh b/scripts/build_wasm.sh
index 45ce0702639..9ffee8a9c67 100755
--- a/scripts/build_wasm.sh
+++ b/scripts/build_wasm.sh
@@ -72,6 +72,9 @@ build() {
         out_file="$TARGET_DIR/$1/$name.wasm"
         cargo run --bin iroha_wasm_builder -- build "$CARGO_DIR/$1/$name" --profile=$PROFILE --out-file "$out_file"
     done
+
+    echo "profile = \"${PROFILE}\"" > "$TARGET_DIR/build_config.toml"
+
     echo "info: WASM $1 build complete"
     echo "artifacts written to $TARGET_DIR/$1/"
 }