diff --git a/.travis.yml b/.travis.yml
index 5799b14..5d2d2ab 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ rust:
   - nightly
 before_install:
   - rustup target add wasm32-unknown-unknown
-  - command -v wasm-build || cargo install pwasm-utils-cli --bin wasm-build
+  - command -v wasm-build || cargo install pwasm-utils-cli --version 0.6.0 --bin wasm-build
   - ./wasm-install.sh
 env:
   - TUTOR_DIR=step-0
diff --git a/README.md b/README.md
index 34d41b8..6145750 100644
--- a/README.md
+++ b/README.md
@@ -14,9 +14,9 @@ rustup target add wasm32-unknown-unknown
 ```
 
 ### Parity wasm-build
-[wasm-build](https://github.com/paritytech/wasm-utils#build-tools-for-cargo) takes the raw `.wasm` file produced by Rust compiler and packs it to the form of valid contract.
+[wasm-build](https://github.com/paritytech/wasm-utils#build-tools-for-cargo) takes the raw `.wasm` file produced by Rust compiler and packs it to the form of valid contract. You will need version `0.6.0` for this tutorial to work.
 ```
-cargo install pwasm-utils-cli --bin wasm-build
+cargo install pwasm-utils-cli --version 0.6.0 --bin wasm-build
 ```
 
 ### Parity
diff --git a/step-0/Cargo.lock b/step-0/Cargo.lock
index 3044bf2..5c13be8 100644
--- a/step-0/Cargo.lock
+++ b/step-0/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "byteorder"
 version = "1.3.0"
diff --git a/step-0/build.sh b/step-0/build.sh
index 0642733..9c3156b 100755
--- a/step-0/build.sh
+++ b/step-0/build.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 
 cargo build --release --target wasm32-unknown-unknown
-wasm-build --target=wasm32-unknown-unknown ./target pwasm_tutorial_contract
+wasm-build --target=wasm32-unknown-unknown --skip-optimization ./target pwasm_tutorial_contract
diff --git a/step-1/Cargo.lock b/step-1/Cargo.lock
index 3044bf2..5c13be8 100644
--- a/step-1/Cargo.lock
+++ b/step-1/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "byteorder"
 version = "1.3.0"
diff --git a/step-1/build.sh b/step-1/build.sh
index 0642733..9c3156b 100755
--- a/step-1/build.sh
+++ b/step-1/build.sh
@@ -1,4 +1,4 @@
 #!/bin/bash
 
 cargo build --release --target wasm32-unknown-unknown
-wasm-build --target=wasm32-unknown-unknown ./target pwasm_tutorial_contract
+wasm-build --target=wasm32-unknown-unknown --skip-optimization ./target pwasm_tutorial_contract
diff --git a/step-5/Cargo.lock b/step-5/Cargo.lock
index d187a74..d810bf0 100644
--- a/step-5/Cargo.lock
+++ b/step-5/Cargo.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "bitflags"
 version = "1.0.4"