diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index d2c7b7c2..8053994e 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -140,7 +140,7 @@ jobs:
       # feel free to update it
       - run: |
           source .github/scripts/assert.sh
-          assert_in "1.1.10" "$(poetry --version)"
+          assert_in "1.1.11" "$(poetry --version)"
 
   # Make sure scripts are not deleted.
   # If we deleted the scripts folder (or subfolders) by accident,
@@ -180,3 +180,26 @@ jobs:
           assert_in  "true"                             "$(poetry config virtualenvs.in-project)"
           assert_in  "/home/runner/.cache/virtualenvs"  "$(poetry config virtualenvs.path)"
           assert_in  "false"                            "$(poetry config installer.parallel)"
+
+  test-installation-arguments-version-unspecified:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          installation-arguments: --git https://github.com/python-poetry/poetry.git@69bd6820e320f84900103fdf867e24b355d6aa5d
+      - run: |
+          source .github/scripts/assert.sh
+          assert_in "1.1.9" "$(poetry --version)"
+
+  test-installation-arguments-version-specified:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: ./
+        with:
+          version: 1.1.7
+          installation-arguments: --git https://github.com/python-poetry/poetry.git@69bd6820e320f84900103fdf867e24b355d6aa5d
+      - run: |
+          source .github/scripts/assert.sh
+          assert_in "1.1.9" "$(poetry --version)"
diff --git a/README.md b/README.md
index 65737330..381ae5c2 100644
--- a/README.md
+++ b/README.md
@@ -31,9 +31,9 @@ If you want to set Poetry config settings, or install a specific version, you ca
     installer-parallel: true
 ```
 
-The action is fully tested for MacOS and Ubuntu runners, on Poetry versions >= 1.1.0.
+If you need to pass extra arguments to the installer script, you can specify these with `installation-arguments`.
 
-If you're using this with Windows, see the [Running on Windows](#windows) section.
+The action is fully tested for MacOS and Ubuntu runners, on Poetry versions >= 1.1.0. If you're using this with Windows, see the [Running on Windows](#windows) section.
 
 ## Defaults
 
@@ -47,6 +47,16 @@ virtualenvs-path: {cache-dir}/virtualenvs
 installer-parallel: true
 ```
 
+You can specify installation arguments directly to the poetry installer using the installation-arguments in the following
+way:
+
+```yaml
+- name: Install and configure Poetry
+  uses: snok/install-poetry@v1
+  with:
+    installation-arguments: --git https://github.com/python-poetry/poetry.git@69bd6820e320f84900103fdf867e24b355d6aa5d
+```
+
 If you want to make further config changes - e.g., to change one of the `experimental` Poetry config settings, or just
 to make changes to the Poetry config *after* invoking the action - you can do so in a subsequent step, like this:
 
@@ -63,7 +73,7 @@ This section contains a collection of workflow examples to try and help
 - Demonstrate how to implement caching for performance improvements
 - Clarify the implications of different settings
 
-Some of the examples are a bit long, so here are some links
+Some examples are a bit long, so here are some links
 
 - [Testing](#testing)
 - [Testing (using an OS matrix)](#testing-using-a-matrix)
diff --git a/action.yml b/action.yml
index 950d28c7..5cd89a21 100644
--- a/action.yml
+++ b/action.yml
@@ -25,6 +25,9 @@ inputs:
     description: "Whether to install many packages at once or one by one. This can fix PyPI DNS resolution errors, but also slows down the installation"
     required: false
     default: "true"
+  installation-arguments:
+    description: "Arguments passed directly to the Poetry installation script. For example --force."
+    required: false
 runs:
   using: "composite"
   steps:
@@ -43,9 +46,9 @@ runs:
         echo -e "\033[33mInstalling Poetry 👷\033[0m\n"
 
         if [ "${{ inputs.version }}" == "latest" ]; then
-          POETRY_HOME=$path python3 $installation_script --yes
+          POETRY_HOME=$path python3 $installation_script --yes ${{ inputs.installation-arguments}}
         else
-          POETRY_HOME=$path python3 $installation_script --yes --version=${{ inputs.version }}
+          POETRY_HOME=$path python3 $installation_script --yes --version=${{ inputs.version }} ${{ inputs.installation-arguments}}
         fi
 
         echo "$path/bin" >>$GITHUB_PATH