--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@
 
 ```bash
 rustup toolchain install 1.49.0
-rustup toolchain install nightly-2020-10-01
+rustup toolchain install nightly-2020-01-27
 rustup default nightly-2021-01-27
 ```
 
--- a/tests/README.md
+++ b/tests/README.md
@@ -2,8 +2,8 @@
 
 ## How to run
 
-1. Run `npm install`.
+1. Run `yarn install`.
 2. Setup a test node. You can do it using `docker-compose up -d` in parent directory.
 3. Optional step - configure tests with env variables or by editing [configuration file](src/config.ts).
-4. Run `npm test`.
+4. Run `yarn test`.