diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7410252..29265df 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -5,7 +5,7 @@ on:
 
 jobs:
   test:
-    name: Test on ${{ matrix.os }} ${{ matrix.arch }}
+    name: Test ${{ matrix.version }} on ${{ matrix.os }} ${{ matrix.arch }}
     runs-on: ${{ matrix.runner }}
     strategy:
       matrix:
@@ -13,15 +13,35 @@ jobs:
           - os: Linux
             arch: x86_64
             runner: ubuntu-latest
+            version: alpha4-rolling
+          - os: Linux
+            arch: x86_64
+            runner: ubuntu-latest
+            version: nightly
+          - os: Linux
+            arch: arm64
+            runner: ubuntu-24.04-arm
+            version: alpha4-rolling
           - os: Linux
             arch: arm64
             runner: ubuntu-24.04-arm
+            version: nightly
           - os: macOS
             arch: x86_64
             runner: macos-15-intel
+            version: alpha4-rolling
+          - os: macOS
+            arch: x86_64
+            runner: macos-15-intel
+            version: nightly
+          - os: macOS
+            arch: arm64
+            runner: macos-latest
+            version: alpha4-rolling
           - os: macOS
             arch: arm64
             runner: macos-latest
+            version: nightly
 
     steps:
       - name: Checkout repository
@@ -29,6 +49,8 @@ jobs:
 
       - name: Setup Roc
         uses: ./
+        with:
+          version: ${{ matrix.version }}
 
       - name: Check Roc version
         run: roc version
diff --git a/README.md b/README.md
index 50a1f47..52c9c5f 100644
--- a/README.md
+++ b/README.md
@@ -11,8 +11,20 @@ A GitHub Action to download and setup the Roc compiler for Linux and macOS.
 
 Add this step to your CI workflow:
 
+### Using Nightly Releases
+
+```yaml
+- uses: roc-lang/setup-roc@TODO
+  with:
+    version: nightly
+```
+
+### Using Major Releases
+
 ```yaml
-TODO
+- uses: roc-lang/setup-roc@TODO
+  with:
+    version: alpha4-rolling
 ```
 
 ## Platform Support
@@ -30,10 +42,12 @@ This action supports the following platforms:
 
 1. Detects your operating system and architecture
 2. Downloads the appropriate Roc compiler release for your platform
-3. Verifies the SHA256 checksum to ensure file integrity
+3. Verifies the SHA256 checksum to ensure file integrity (skipped for nightly releases)
 4. Extracts the compiler
 5. Adds the Roc executable to the PATH
 
 ## Security
 
-The action verifies the SHA256 checksum of the downloaded file to ensure it hasn't been tampered with. If the checksum doesn't match, the action will fail.
+For major releases, the action verifies the SHA256 checksum of the downloaded file to ensure it hasn't been tampered with. If the checksum doesn't match, the action will fail.
+
+For nightly releases, SHA256 verification is skipped since the files are updated regularly.
diff --git a/action.yml b/action.yml
index 1a6775e..ccdcb08 100644
--- a/action.yml
+++ b/action.yml
@@ -4,6 +4,11 @@ branding:
   icon: 'download'
   color: 'purple'
 
+inputs:
+  version:
+    description: 'Version of Roc to install (e.g., "nightly", "alpha4-rolling")'
+    required: true
+
 runs:
   using: 'composite'
   steps:
@@ -12,6 +17,9 @@ runs:
       run: |
         set -euo pipefail
 
+        VERSION="${{ inputs.version }}"
+        echo "Installing Roc version: $VERSION"
+
         # Detect OS and architecture
         OS=$(uname -s)
         ARCH=$(uname -m)
@@ -68,23 +76,35 @@ runs:
         esac
 
         # Download Roc
-        DOWNLOAD_URL="https://github.com/roc-lang/roc/releases/download/alpha4-rolling/roc-${PLATFORM}-alpha4-rolling.tar.gz"
+        if [[ "$VERSION" == "nightly" ]]; then
+          DOWNLOAD_URL="https://github.com/roc-lang/roc/releases/download/nightly/roc_nightly-${PLATFORM}-latest.tar.gz"
+          SKIP_SHA_CHECK=true
+          DIR_PATTERN="roc_nightly-${PLATFORM}-*"
+        else
+          DOWNLOAD_URL="https://github.com/roc-lang/roc/releases/download/${VERSION}/roc-${PLATFORM}-${VERSION}.tar.gz"
+          SKIP_SHA_CHECK=false
+        fi
+
         echo "Downloading Roc for $PLATFORM..."
         curl -fsSL -o roc.tar.gz "$DOWNLOAD_URL"
 
-        # Verify SHA256 checksum
-        echo "Verifying SHA256 checksum..."
-        ACTUAL_SHA=$($SHA_CMD roc.tar.gz | awk '{print $1}')
+        # Verify SHA256 checksum (skip for nightly releases)
+        if [[ "$SKIP_SHA_CHECK" == "false" ]]; then
+          echo "Verifying SHA256 checksum..."
+          ACTUAL_SHA=$($SHA_CMD roc.tar.gz | awk '{print $1}')
 
-        if [[ "$ACTUAL_SHA" != "$EXPECTED_SHA" ]]; then
-          echo "Error: SHA256 checksum mismatch!"
-          echo "Expected: $EXPECTED_SHA"
-          echo "Actual:   $ACTUAL_SHA"
-          echo "This should never happen and could mean the file is malicious. Please make a post on <https://roc.zulipchat.com> and request investigation of this incident."
-          exit 1
-        fi
+          if [[ "$ACTUAL_SHA" != "$EXPECTED_SHA" ]]; then
+            echo "Error: SHA256 checksum mismatch!"
+            echo "Expected: $EXPECTED_SHA"
+            echo "Actual:   $ACTUAL_SHA"
+            echo "This should never happen and could mean the file is malicious. Please make a post on <https://roc.zulipchat.com> and request investigation of this incident."
+            exit 1
+          fi
 
-        echo "SHA256 checksum verified successfully"
+          echo "SHA256 checksum verified successfully"
+        else
+          echo "Skipping SHA256 verification for nightly release"
+        fi
 
         # Extract Roc
         echo "Extracting Roc..."