diff --git a/README.md b/README.md
index 94b8a46..4dd16df 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ Also installs arm-gcc gnu toolchain.
 
 - `version` - Specified version of the SDK. Optional. Default value is `latest`.
 - `cache` - Cache installer. Default by `true`.
+- `custom-url` - Custom URL to the SDK installer. Useful for beta versions. If set, `version` will be ignored.
 
 
 ## Usage Example
diff --git a/action.yml b/action.yml
index b219fc8..7490850 100644
--- a/action.yml
+++ b/action.yml
@@ -9,6 +9,9 @@ inputs:
     default: latest
     description: SDK version (ex. `2.0.0` or default `latest`).
     required: false
+  custom-url:
+    description: Custom URL to the SDK installer. Useful for beta versions.
+    required: false
   cache:
     default: "true"
     description: Cache installer.
@@ -39,7 +42,7 @@ runs:
         URL="https://download.panic.com/playdate_sdk${RUNNER_OS_PART?}PlaydateSDK-${{ inputs.version }}.${OS_EXT?}"
         echo "filename=sdk.$OS_EXT" >> $GITHUB_OUTPUT
         echo "ext=$OS_EXT" >> $GITHUB_OUTPUT
-        echo "url=$URL" >> $GITHUB_OUTPUT
+        echo "url=${{ inputs.custom-url || '$URL' }}" >> $GITHUB_OUTPUT
 
     - name: get direct url
       id: direct-url