diff --git a/.github/workflows/dart.yml b/.github/workflows/dart.yml
index 4bfa886..b3adb34 100644
--- a/.github/workflows/dart.yml
+++ b/.github/workflows/dart.yml
@@ -13,9 +13,9 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        # Test latest stable, beta, and dev channels + last stable release
+        # Test latest stable, beta, dev, and main channels + last stable release
         # prior to the introduction of the unified `dart` developer tool.
-        sdk: [stable, beta, dev, 2.9.3, 2.12.0-29.10.beta]
+        sdk: [stable, beta, dev, main, 2.9.3, 2.12.0-29.10.beta]
     steps:
       - uses: actions/checkout@v2
       - uses: ./
diff --git a/README.md b/README.md
index 263a45f..b912a8d 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,17 @@ This [GitHub Action]() installs and sets up of a Dart SDK for use in actions by:
 
 # Usage
 
-## Basic
+## Inputs
+
+The action takes the following inputs:
+
+  * `sdk`: Which SDK version to setup. Can be specified using one of two forms:
+    * A specific SDK version, e.g. `2.7.2` or `2.12.0-1.4.beta`
+    * A release channel, which will install the latest build from that channel.
+      Available channels are `stable`, `beta`, `dev`, and `main`. See
+      https://dart.dev/tools/sdk/archive for details.
+
+## Basic example
 
 Install the latest stable SDK, and run Hello World.
 
@@ -37,7 +47,7 @@ jobs:
         run: dart bin/hello_world.dart
 ```
 
-## Check static analysis, formatting, and tests
+## Check static analysis, formatting, and test example
 
 Various static checks:
 
@@ -62,7 +72,7 @@ Various static checks:
         run: dart test
 ```
 
-## Matrix testing
+## Matrix testing example
 
 You can create matrix jobs that run tests on multiple operating systems, and
 multiple versions of the Dart SDK.
@@ -101,7 +111,7 @@ jobs:
         run: dart test
 ```
 
-## Testing older Dart SDKs
+## Testing older Dart SDKs example
 
 The Dart SDK continously evolves, and new features and tools are added. The Dart
 2.10 SDK introduced a new unified `dart` developer tool, which is what we use in
@@ -154,6 +164,10 @@ jobs:
 
 # Version history
 
+## v0.3
+
+  * Added support for installing SDKs from the `main` channel.
+
 ## v0.2
 
   * Added support for installing a specific SDK version (e.g. `2.10.0`).
diff --git a/setup.sh b/setup.sh
index 1b75710..1b749c9 100755
--- a/setup.sh
+++ b/setup.sh
@@ -3,7 +3,7 @@
 ###############################################################################
 # Bash script that downloads and does setup for a Dart SDK.                   #
 # Takes three params; first listed is the default:                            #
-# $1: Dart SDK version/channel: stable|beta|dev|<version_string>              #
+# $1: Dart SDK version/channel: stable|beta|dev|main|<version_string>         #
 # $2: Dart channel (DEPRECATED): stable|beta|dev                              #
 # $3: OS: Linux|Windows|macOS                                                 #
 # $4: ARCH: x64|ia32                                                          #
@@ -23,7 +23,7 @@ CHANNEL=
 VERSION=
 
 # Check for a specific version
-if [[ $SDK == stable || $SDK == beta || $SDK == dev ]]
+if [[ $SDK == stable || $SDK == beta || $SDK == dev || $SDK == main ]]
 then
   CHANNEL=$SDK
   VERSION=latest
@@ -37,6 +37,10 @@ else
   elif [[ "$SDK" == *"beta"* ]]
   then
     CHANNEL=beta
+  elif [[ "$SDK" == *"main"* ]]
+  then
+    echo -e "::error::Versions cannot be specified for builds from the main channel."
+    exit 1
   fi
 fi
 
@@ -48,7 +52,13 @@ echo "Installing Dart SDK version \"${VERSION}\" from the ${CHANNEL} channel on
 # Calculate download Url. Based on:
 # https://dart.dev/tools/sdk/archive#download-urls
 PREFIX="https://storage.googleapis.com/dart-archive/channels"
-URL="${PREFIX}/${CHANNEL}/release/${VERSION}/sdk/dartsdk-${OS}-${ARCH}-release.zip"
+BUILD="sdk/dartsdk-${OS}-${ARCH}-release.zip"
+if [[ $SDK == main ]]
+then
+  URL="${PREFIX}/be/raw/latest/${BUILD}"
+else
+  URL="${PREFIX}/${CHANNEL}/release/${VERSION}/${BUILD}"
+fi
 echo "Downloading ${URL}..."
 
 # Download installation zip.