diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 46f01d1b84..2f860c0784 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -16,14 +16,14 @@ jobs:
 
     - name: setup
       run: |
-          rustup install nightly --profile default
-          rustup +nightly target add wasm32-unknown-unknown
+          rustup install nightly-2020-10-01 --profile default
+          rustup target add wasm32-unknown-unknown --toolchain nightly-2020-10-01
 
     - name: fmt
-      run: cargo +nightly fmt --all -- --check
+      run: cargo +nightly-2020-10-01 fmt --all -- --check
 
     - name: build
-      run: cargo build --workspace --verbose
+      run: cargo +nightly-2020-10-01 build --workspace --verbose
 
     - name: test
-      run: cargo test --workspace --verbose -- --test-threads=1
+      run: cargo +nightly-2020-10-01 test --workspace --verbose -- --test-threads=1
diff --git a/src/extrinsic/signer.rs b/src/extrinsic/signer.rs
index d5e5d2145f..7898ecf07d 100644
--- a/src/extrinsic/signer.rs
+++ b/src/extrinsic/signer.rs
@@ -54,7 +54,7 @@ pub trait Signer<T: Runtime> {
 }
 
 /// Extrinsic signer using a private key.
-#[derive(Debug)]
+#[derive(Clone, Debug)]
 pub struct PairSigner<T: Runtime, P: Pair> {
     account_id: T::AccountId,
     nonce: Option<T::Index>,