diff --git a/README.md b/README.md
index 6cb6389..fca9508 100644
--- a/README.md
+++ b/README.md
@@ -71,20 +71,20 @@ Optionally can export dependency tree to requirements.txt file.
 
 
 ### Inputs
-| Name                      | Description                                                                                                                | Optional | Default value               |
-|---------------------------|:---------------------------------------------------------------------------------------------------------------------------|----------|-----------------------------|
-| pypi_repo_url             | URL of python package index (for custom packages)                                                                          | False    |                             |
-| pypi_token_username       | Package index authentication username.                                                                                     | False    |                             |
-| pypi_token                | Package index authentication token or password.                                                                            | False    |                             |
-| export_requirements       | Set to `true` if need to generate requirements.txt. **Optional** defaults to **false**.                                    | False    |                             |
-| export_credentials        | If export_requirements is set to true, it exports requirements.txt with --with-credentials flag. Otherwise, does nothing.  | True     | true                        |
-| requirements_path         | Path to requirements.txt to be generated (relative to sources root).                                                       | True     | .container/requirements.txt | 
-| install_preview           | Install preview version of Poetry. This should be set to **true** in build process until Poetry version 1.2.0 is released. | True     | false                       |
-| version                   | Version to install. If value is 'latest', script will install the latest available version of Poetry.                      | True     | latest                      |
-| install_extras            | List of optional dependencies to install, separated by space. If value is 'all', all extras will be installed              | True     |                             |
-| install_only_dependencies | If set to true, installs only dependencies for project, adds the parameter `--no-root` to `poetry install` command.        | True     | false                       |
-| skip_dependencies         | If set to true, installs only poetry without installing dependencies.                                                      | True     | false                       |
-| export_dev_requirements   | If export_requirements is set to true, it exports dev requirements.txt with --without-dev flag. Otherwise, does nothing.   | True     | true                        |
+| Name                      | Description                                                                                                                | Optional  | Default value               |
+|---------------------------|:---------------------------------------------------------------------------------------------------------------------------|-----------|-----------------------------|
+| pypi_repo_url             | URL of python package index (for custom packages)                                                                          | True      | ""                          |
+| pypi_token_username       | Package index authentication username.                                                                                     | True      | ""                          |
+| pypi_token                | Package index authentication token or password.                                                                            | True      | ""                          |
+| export_requirements       | Set to `true` if need to generate requirements.txt. **Optional** defaults to **false**.                                    | True      | false                       |
+| export_credentials        | If export_requirements is set to true, it exports requirements.txt with --with-credentials flag. Otherwise, does nothing.  | True      | true                        |
+| requirements_path         | Path to requirements.txt to be generated (relative to sources root).                                                       | True      | .container/requirements.txt | 
+| install_preview           | Install preview version of Poetry. This should be set to **true** in build process until Poetry version 1.2.0 is released. | True      | false                       |
+| version                   | Version to install. If value is 'latest', script will install the latest available version of Poetry.                      | True      | latest                      |
+| install_extras            | List of optional dependencies to install, separated by space. If value is 'all', all extras will be installed              | True      |                             |
+| install_only_dependencies | If set to true, installs only dependencies for project, adds the parameter `--no-root` to `poetry install` command.        | True      | false                       |
+| skip_dependencies         | If set to true, installs only poetry without installing dependencies.                                                      | True      | false                       |
+| export_dev_requirements   | If export_requirements is set to true, it exports dev requirements.txt with --without-dev flag. Otherwise, does nothing.   | True      | true                        |
 
 ### Outputs
 | Name             | Description                                                  |
diff --git a/install_poetry/action.yaml b/install_poetry/action.yaml
index 93c6b5e..14e97f8 100644
--- a/install_poetry/action.yaml
+++ b/install_poetry/action.yaml
@@ -8,15 +8,18 @@ branding:
 inputs:
   pypi_repo_url:
     description: URL of python package index (for custom packages)
-    required: true
+    required: false
+    default: ""
 
   pypi_token_username:
-    description: Package index authentication username.
-    required: true
+    description: Package index authentication username  (for custom packages)
+    required: false
+    default: ""
 
   pypi_token:
-    description: Package index authentication token or password.
-    required: true
+    description: Package index authentication token or password  (for custom packages)
+    required: false
+    default: ""
 
   export_requirements:
     description: Set to true if need to generate requirements.txt
diff --git a/install_poetry/install_poetry.sh b/install_poetry/install_poetry.sh
index 242b18c..2e5469c 100755
--- a/install_poetry/install_poetry.sh
+++ b/install_poetry/install_poetry.sh
@@ -26,8 +26,11 @@ fi
 
 curl -sSL https://install.python-poetry.org | python3 -
 export PATH=$HOME/.local/bin:$PATH
-poetry config repositories.custom_repo "$REPO_URL"
-echo "custom_repo_name=custom_repo" >> "$GITHUB_OUTPUT"
+
+if [[ -n "$REPO_URL" ]]; then
+  poetry config repositories.custom_repo "$REPO_URL"
+  echo "custom_repo_name=custom_repo" >> "$GITHUB_OUTPUT"
+fi;
 
 POETRY_ADDITIONAL_OPTIONS=()
 if [[ -n "$EXTRAS" ]]; then