--- a/.env
+++ b/.env
@@ -1,4 +1,4 @@
-RUST_TOOLCHAIN=nightly-2022-04-07
+RUST_TOOLCHAIN=nightly-2022-05-11
 RUST_C=1.62.0-nightly
 POLKA_VERSION=release-v0.9.22
 UNIQUE_BRANCH=develop
--- a/README.md
+++ b/README.md
@@ -51,14 +51,14 @@
 3. Install install nightly 2021-11-11 and make it default:
 
 ```bash
-rustup toolchain install nightly-2022-04-07
-rustup default nightly-2022-04-07
+rustup toolchain install nightly-2022-05-11
+rustup default nightly-2022-05-11
 ```
 
 4. Add wasm target for nightly toolchain:
 
 ```bash
-rustup target add wasm32-unknown-unknown --toolchain nightly-2022-04-07
+rustup target add wasm32-unknown-unknown --toolchain nightly-2022-05-11
 ```
 
 5. Build: