diff --git a/README.md b/README.md
index 04f6d4e..517168f 100644
--- a/README.md
+++ b/README.md
@@ -24,6 +24,7 @@ If you have an existing `fly.toml` in your repo, this action will copy it with a
 | `cpukind`  | Set app VM CPU kind - shared or performance. Default shared.                                                                                                                                             |
 | `memory`   | Set app VM memory in megabytes. Default 256.                                                                                                                                                             |
 | `ha`       | Create spare machines that increases app availability. Default `false`.                                                                                                                                  |
+| `dockerfile`       | Path to a Dockerfile, that will be used for building the image                                     |
 
 ## Required Secrets
 
@@ -90,6 +91,8 @@ jobs:
       - name: Deploy app
         id: deploy
         uses: superfly/fly-pr-review-apps@1.0.0
+        with:
+         dockerfile: "./Dockerfile"
 
       - name: Clean up GitHub environment
         uses: strumwolf/delete-deployment-environment@v2
diff --git a/action.yml b/action.yml
index 0748d75..06e59a4 100644
--- a/action.yml
+++ b/action.yml
@@ -38,3 +38,6 @@ inputs:
   ha:
     description: Create spare machines that increases app availability (default false)
     default: false
+  dockerfile:
+    description: Path to a Dockerfile, will be used for building the image
+    required: true
diff --git a/entrypoint.sh b/entrypoint.sh
index 1ec9f5c..3fd40b6 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -24,6 +24,7 @@ region="${INPUT_REGION:-${FLY_REGION:-iad}}"
 org="${INPUT_ORG:-${FLY_ORG:-personal}}"
 image="$INPUT_IMAGE"
 config="${INPUT_CONFIG:-fly.toml}"
+dockerfile="$INPUT_DOCKERFILE"
 
 if ! echo "$app" | grep "$PR_NUMBER"; then
   echo "For safety, this action requires the app's name to contain the PR number."
@@ -40,7 +41,7 @@ fi
 if ! flyctl status --app "$app"; then
   # Backup the original config file since 'flyctl launch' messes up the [build.args] section
   cp "$config" "$config.bak"
-  flyctl launch --no-deploy --copy-config --name "$app" --image "$image" --region "$region" --org "$org"
+  flyctl launch --no-deploy --copy-config --name "$app" --dockerfile "$dockerfile" --image "$image" --region "$region" --org "$org"
   # Restore the original config file
   cp "$config.bak" "$config"
 fi