--- a/.env
+++ b/.env
@@ -1,7 +1,7 @@
-RUST_TOOLCHAIN=nightly-2022-05-11
-POLKADOT_BUILD_BRANCH=release-v0.9.24
+RUST_TOOLCHAIN=nightly-2022-07-24
+POLKADOT_BUILD_BRANCH=release-v0.9.27
 
-POLKADOT_MAINNET_BRANCH=release-v0.9.25
+POLKADOT_MAINNET_BRANCH=release-v0.9.26
 UNIQUE_MAINNET_TAG=v924010
 
 KUSAMA_MAINNET_BRANCH=release-v0.9.26
--- a/README.md
+++ b/README.md
@@ -51,14 +51,14 @@
 3. Install toolchain nightly-2022-05-11 and make it default:
 
 ```bash
-rustup toolchain install nightly-2022-05-11
-rustup default nightly-2022-05-11
+rustup toolchain install nightly-2022-07-24
+rustup default nightly-2022-07-24
 ```
 
 4. Add wasm target for nightly toolchain:
 
 ```bash
-rustup target add wasm32-unknown-unknown --toolchain nightly-2022-05-11
+rustup target add wasm32-unknown-unknown --toolchain nightly-2022-07-24
 ```
 
 5. Build: