diff --git a/.github/actions/install-rust/README.md b/.github/actions/install-rust/README.md
index e90a00f4..df8e94dc 100644
--- a/.github/actions/install-rust/README.md
+++ b/.github/actions/install-rust/README.md
@@ -1,7 +1,5 @@
 # install-rust
 
-Author: Alex Crichton <alex@alexcrichton.com>
-
 A small github action to install `rustup` and a Rust toolchain. This is
 generally expressed inline, but it was repeated enough in this repository it
 seemed worthwhile to extract.
@@ -17,4 +15,4 @@ When the above are fixed we should delete this action and just use this inline:
 ```yml
 - run: rustup update $toolchain && rustup default $toolchain
   shell: bash
-```
\ No newline at end of file
+```
diff --git a/.github/actions/install-rust/action.yml b/.github/actions/install-rust/action.yml
index d82fe182..7a196591 100644
--- a/.github/actions/install-rust/action.yml
+++ b/.github/actions/install-rust/action.yml
@@ -1,4 +1,3 @@
-# Author: Alex Crichton <alex@alexcrichton.com>
 name: 'Install Rust toolchain'
 description: 'Install both `rustup` and a Rust toolchain'
 
@@ -10,4 +9,4 @@ inputs:
 
 runs:
   using: node12
-  main: 'main.js'
\ No newline at end of file
+  main: 'main.js'
diff --git a/.github/actions/install-rust/main.js b/.github/actions/install-rust/main.js
index f464bbab..9f16b818 100644
--- a/.github/actions/install-rust/main.js
+++ b/.github/actions/install-rust/main.js
@@ -1,11 +1,15 @@
-// Author: Alex Crichton <alex@alexcrichton.com>
 const child_process = require('child_process');
 const toolchain = process.env.INPUT_TOOLCHAIN;
+const fs = require('fs');
+
+function set_env(name, val) {
+  fs.appendFileSync(process.env['GITHUB_ENV'], `${name}=${val}\n`)
+}
 
 if (process.platform === 'darwin') {
   child_process.execSync(`curl https://sh.rustup.rs | sh -s -- -y --default-toolchain=none --profile=minimal`);
   const bindir = `${process.env.HOME}/.cargo/bin`;
-  console.log(`::add-path::${bindir}`);
+  fs.appendFileSync(process.env['GITHUB_PATH'], `${bindir}\n`);
   process.env.PATH = `${process.env.PATH}:${bindir}`;
 }
 
@@ -16,13 +20,13 @@ child_process.execFileSync('rustup', ['default', toolchain]);
 // Deny warnings on CI to keep our code warning-free as it lands in-tree. Don't
 // do this on nightly though since there's a fair amount of warning churn there.
 if (!toolchain.startsWith('nightly')) {
-  console.log(`::set-env name=RUSTFLAGS::-D warnings`);
+  set_env("RUSTFLAGS", "-D warnings");
 }
 
 // Save disk space by avoiding incremental compilation, and also we don't use
 // any caching so incremental wouldn't help anyway.
-console.log(`::set-env name=CARGO_INCREMENTAL::0`);
+set_env("CARGO_INCREMENTAL", "0");
 
 // Turn down debuginfo from 2 to 1 to help save disk space
-console.log(`::set-env name=CARGO_PROFILE_DEV_DEBUG::1`);
-console.log(`::set-env name=CARGO_PROFILE_TEST_DEBUG::1`);
\ No newline at end of file
+set_env("CARGO_PROFILE_DEV_DEBUG", "1");
+set_env("CARGO_PROFILE_TEST_DEBUG", "1");
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cb051dcf..f2f3aff3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,7 +11,7 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         submodules: true
     - uses: ./.github/actions/install-rust
@@ -37,7 +37,7 @@ jobs:
             rust: nightly
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         submodules: true
     - uses: ./.github/actions/install-rust
@@ -81,7 +81,7 @@ jobs:
             rust: nightly
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v2
       with:
         submodules: true
     - uses: ./.github/actions/install-rust