diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index bf753c4..dbe69ad 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -32,6 +32,21 @@ jobs:
           website: "https://greenboi.me"
           categories: "mods maps tools items"
       - run: echo ${{ steps.pub.outputs.url }}
+      - uses: actions/checkout@v3
+      - id: pub_prebuilt
+        uses: ./
+        with:
+          namespace: GreenTF
+          description: Test
+          dev: true
+          token: ${{ secrets.TS_KEY }}
+          name: test
+          version: 0.${{ github.run_number }}.1
+          community: test # needs to be test for thunderstore.dev
+          file: test_zip.zip
+
+          
+      
       
 
   # publish:
diff --git a/Dockerfile b/Dockerfile
index a29ba19..ed5ae7d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,4 +8,5 @@ RUN ["mv", "-v", "tcli-0.1.4-linux-x64/tcli", "/bin/tcli"]
 COPY ./entrypoint.sh /entrypoint.sh
 COPY ./cfg_edit.js /cfg_edit.js
 RUN ["chmod", "+x", "/entrypoint.sh"]
+RUN ["deno",  "cache", "/cfg_edit.js"]
 ENTRYPOINT ["/entrypoint.sh"]
diff --git a/README.md b/README.md
index 580b3fd..c24bded 100644
--- a/README.md
+++ b/README.md
@@ -48,9 +48,10 @@ Check the wiki [here](https://github.com/GreenTF/upload-thunderstore-package/wik
 | `name` | Name of the package. | `true` |
 | `description` | Description of the package that will appear on Thunderstore. | `true` |
 | `version` | Package version in SemVer format. | `true` |
+| `file` | Path to a prebuilt zip file. Will skip the build step if provided. | `false` |
 | `path` | Path of the files to package. Useful when using build artifacts from other steps. Defaults to using the contents of the repo. | `false` |
 | `icon` | URL to download the icon from. Will try to find `icon.png` in the root of the repo if not provided. | `false` |
-| `readme` | URL to download the readme from. Will try to fine `README.md` in the root of the repo if not provided. | `false` |
+| `readme` | URL to download the readme from. Will try to find `README.md` in the root of the repo if not provided. | `false` |
 | `dev` | Publish to https://thunderstore.dev if set, https://thunderstore.io if not set. | `false` |
 | `wrap` | Directory to wrap the contents of the repo in. By default the contents of the root of the repo will be in the root of the package. | `false` |
 | `categories` | A list, separated by spaces of categories to give to the mod when published. These must be available in the community you're publishing to. | `false` |
diff --git a/action.yml b/action.yml
index ebe4a0c..361bdfd 100644
--- a/action.yml
+++ b/action.yml
@@ -42,12 +42,14 @@ inputs:
     description: 'List of dependencies by name & version'
   nsfw:
     description: 'Is the mod NSFW'
+  file:
+    description: 'Prebuilt .zip file to use, relative to the repo root'
 outputs:
   url:
     description: 'URL of uploaded mod'
 runs:
   using: docker
-  image: Dockerfile
+  image: ghcr.io/greentf/utp:latest
   env: 
     TCLI_AUTH_TOKEN: ${{ inputs.token }}
     TS_COMMUNITY: ${{ inputs.community }}
@@ -64,3 +66,4 @@ runs:
     TS_CATEGORIES: ${{ inputs.categories }}
     TS_DEPS: ${{ inputs.deps }}
     TS_NSFW: ${{ inputs.nsfw }}
+    TS_FILE: ${{ inputs.file }}
diff --git a/cfg_edit.js b/cfg_edit.js
index a7c7fde..f703681 100644
--- a/cfg_edit.js
+++ b/cfg_edit.js
@@ -1,9 +1,4 @@
-import * as TOML from "https://unpkg.com/@aduh95/toml@0.4.2/web/toml2js.js";
-
-//init toml parser for some reason idk there was no Deno native module
-await TOML.default();
-
-
+import * as TOML from "npm:@aduh95/toml@0.4.2";
 
 //Read in thunderstore.toml
 const tstore = TOML.parse(await Deno.readTextFile("./thunderstore.toml"));
diff --git a/entrypoint.sh b/entrypoint.sh
index 9d33e7d..b1c4e4d 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -68,16 +68,26 @@ function publish() {
   else
     repo="https://thunderstore.io"
   fi
-  echo "::group::Build and publish"
-  tcli build
-  echo "Publish to $repo"
-  out=$(tcli publish --repository ${repo} --file build/*.zip) #capture the output to get the URL
+
+  # skip the build if there is a prebuilt package provided
+  if [ -n "$TS_FILE" ]; then
+    echo "::group::Publish package"
+    echo "Publish to $repo"
+    file="dist/$TS_FILE"
+  else
+    echo "::group::Build and publish"
+    tcli build
+    echo "Publish to $repo"
+    file="build/*.zip"
+  fi
+
+  out=$(tcli publish --repository ${repo} --file ${file}) #capture the output to get the URL
   # A bad response from the server doesn't exit with a non-zero status code
   if [[ $? -ne 0 ]]; then
     echo "::error::$(echo ${out} | grep -Eo ERROR:.*)"
     exit 1
   fi
-  echo "::set-output name=url::$(echo ${out} | grep -Eo "https.*")"
+  echo "url=$(echo ${out} | grep -Eo "https.*")" >> $GITHUB_OUTPUT
   echo "Done!"
   echo "::endgroup::"
 }
diff --git a/test_zip.zip b/test_zip.zip
new file mode 100644
index 0000000..f928b2b
Binary files /dev/null and b/test_zip.zip differ