diff --git a/README.md b/README.md
index d1d5499e..2c39f82c 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ If the file does not exist the action exits silently.
 #### Inputs
 
 - `token` - `GITHUB_TOKEN` or a `repo` scoped [PAT](https://help.github.com/en/github/authenticating-to-github/creating-a-personal-access-token-for-the-command-line). Defaults to `GITHUB_TOKEN`.
+- `issue-number` - The issue number of an existing issue to update
 - `title` (**required**) - The title of the issue
 - `content-filepath` (**required**) - The file path to the issue content
 - `labels` - A comma separated list of labels
@@ -33,6 +34,10 @@ If the file does not exist the action exits silently.
 - `project` - The name of the project for which a card should be created (Requires `project-column-name`)
 - `project-column` - The name of the project column under which a card should be created
 
+#### Outputs
+
+- `issue-number` - The number of the created issue
+
 ## Actions that pair with this action
 
 - [Link Checker](https://github.com/peter-evans/link-checker) - An action for link checking repository Markdown and HTML files
diff --git a/action.yml b/action.yml
index 0bdccd9e..7fa8b53c 100644
--- a/action.yml
+++ b/action.yml
@@ -4,6 +4,8 @@ inputs:
   token:
     description: 'The GitHub authentication token'
     default: ${{ github.token }}
+  issue-number:
+    description: 'The issue number of an existing issue to update'
   title:
     description: 'The title of the issue.'
     required: true
@@ -17,6 +19,9 @@ inputs:
     description: 'The name of the project for which a card should be created.'
   project-column:
     description: 'The name of the project column under which a card should be created.'
+outputs:
+  issue-number:
+    description: 'The number of the created issue.'
 runs:
   using: 'node12'
   main: 'dist/index.js'
diff --git a/dist/src/create_issue_from_file.py b/dist/ciff/create_issue_from_file.py
similarity index 56%
rename from dist/src/create_issue_from_file.py
rename to dist/ciff/create_issue_from_file.py
index b583d64c..0c529884 100755
--- a/dist/src/create_issue_from_file.py
+++ b/dist/ciff/create_issue_from_file.py
@@ -2,7 +2,7 @@
 ''' Create Issue From File '''
 import os
 from pathlib import Path
-from github import Github
+from github import Github, GithubException
 
 # Fetch required environment variables
 github_token = os.environ['GITHUB_TOKEN']
@@ -11,11 +11,44 @@
 issue_content_path = os.environ['CIFF_CONTENT_FILEPATH']
 
 # Fetch optional environment variables
+issue_number = os.environ.get('CIFF_ISSUE_NUMBER')
 issue_labels = os.environ.get('CIFF_LABELS')
 issue_assignees = os.environ.get('CIFF_ASSIGNEES')
 project_name = os.environ.get('CIFF_PROJECT_NAME')
 project_column_name = os.environ.get('CIFF_PROJECT_COLUMN_NAME')
 
+
+def create_project_card(github_repo, project_name, project_column_name, issue):
+    # Locate the project by name
+    project = None
+    for project_item in github_repo.get_projects("all"):
+        if project_item.name == project_name:
+            project = project_item
+            break
+
+    if not project:
+        print("::error::Project not found. Unable to create project card.")
+        return
+
+    # Locate the column by name
+    column = None
+    for column_item in project.get_columns():
+        if column_item.name == project_column_name:
+            column = column_item
+            break
+
+    if not column:
+        print("::error::Project column not found. Unable to create project card.")
+        return
+
+    # Create a project card for the pull request
+    column.create_card(content_id=issue.id, content_type="Issue")
+    print(
+        "Added issue #%d to project '%s' under column '%s'"
+        % (issue.number, project.name, column.name)
+    )
+
+
 # If the file does not exist there is no issue to create
 if not Path(issue_content_path).is_file():
     print("File not found")
@@ -28,9 +61,19 @@
 # Fetch the repository object
 g = Github(github_token)
 repo = g.get_repo(github_repository)
-# Create the issue
-issue = repo.create_issue(issue_title, issue_content)
-print("Created issue %d" % (issue.number))
+
+if issue_number is not None:
+    # Update an existing issue
+    issue = repo.get_issue(int(issue_number))
+    issue.edit(title=issue_title, body=issue_content)
+    print("Updated issue %d" % (issue.number))
+else:
+    # Create an issue
+    issue = repo.create_issue(title=issue_title, body=issue_content)
+    print("Created issue %d" % (issue.number))
+
+# Set the step output
+os.system(f"echo ::set-output name=issue-number::{issue.number}")
 
 if issue_labels is not None:
     # Split the labels input into a list
@@ -50,30 +93,17 @@
     print("Assigning issue to assignees")
     issue.edit(assignees=assignees_list)
 
+# Create a project card for the pull request
 if project_name is not None and project_column_name is not None:
-    # Locate the project by name
-    project = None
-    for project_item in repo.get_projects("all"):
-        if project_item.name == project_name:
-            project = project_item
-            break
-
-    if not project:
-        print("Project not found")
-        exit(0)
-
-    # Locate the column by name
-    column = None
-    for column_item in project.get_columns():
-        if column_item.name == project_column_name:
-            column = column_item
-            break
-
-    if not column:
-        print("Project column not found")
-        exit(0)
-
-    # Add the issue to the project
-    card = column.create_card(content_id=issue.id, content_type="Issue")
-    print("Added issue %d to project \"%s\" under column \"%s\"" \
-        % (issue.number, project.name, column.name))
\ No newline at end of file
+    try:
+        create_project_card(
+            repo, project_name, project_column_name, issue
+        )
+    except GithubException as e:
+        # Likely caused by "Project already has the associated issue."
+        if e.status == 422:
+            print(
+                "Create project card failed - {}".format(
+                    e.data["errors"][0]["message"]
+                )
+            )
diff --git a/dist/ciff/requirements.txt b/dist/ciff/requirements.txt
new file mode 100644
index 00000000..a6ad034e
--- /dev/null
+++ b/dist/ciff/requirements.txt
@@ -0,0 +1,3 @@
+setuptools==46.1.3
+wheel==0.34.2
+PyGithub==1.47
diff --git a/dist/index.js b/dist/index.js
index 4baf5d73..aa23636f 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -34,7 +34,7 @@ module.exports =
 /******/ 	// the startup function
 /******/ 	function startup() {
 /******/ 		// Load entry module and return exports
-/******/ 		return __webpack_require__(104);
+/******/ 		return __webpack_require__(676);
 /******/ 	};
 /******/
 /******/ 	// run startup
@@ -973,21 +973,6 @@ module.exports = util.assign(
 
 module.exports = require("tls");
 
-/***/ }),
-
-/***/ 58:
-/***/ (function(module, __unusedexports, __webpack_require__) {
-
-// Unique ID creation requires a high quality random # generator.  In node.js
-// this is pretty straight-forward - we use the crypto API.
-
-var crypto = __webpack_require__(417);
-
-module.exports = function nodeRNG() {
-  return crypto.randomBytes(16);
-};
-
-
 /***/ }),
 
 /***/ 87:
@@ -998,72 +983,6 @@ module.exports = require("os");
 /***/ }),
 
 /***/ 104:
-/***/ (function(__unusedmodule, __unusedexports, __webpack_require__) {
-
-const { inspect } = __webpack_require__(669);
-const core = __webpack_require__(470);
-const exec = __webpack_require__(986);
-const setupPython = __webpack_require__(139);
-
-async function run() {
-  try {
-    // Allows ncc to find assets to be included in the distribution
-    const src = __webpack_require__.ab + "src";
-    core.debug(`src: ${src}`);
-
-    // Setup Python from the tool cache
-    setupPython("3.8.x", "x64");
-
-    // Install requirements
-    await exec.exec("pip", [
-      "install",
-      "--requirement",
-      `${src}/requirements.txt`,
-      "--no-index",
-      `--find-links=${__dirname}/vendor`
-    ]);
-
-    // Fetch action inputs
-    const inputs = {
-      token: core.getInput("token"),
-      title: core.getInput("title"),
-      contentFilepath: core.getInput("content-filepath"),
-      labels: core.getInput("labels"),
-      assignees: core.getInput("assignees"),
-      project: core.getInput("project"),
-      projectColumn: core.getInput("project-column")
-    };
-    core.debug(`Inputs: ${inspect(inputs)}`);
-
-    // Set environment variables from inputs.
-    if (inputs.token) process.env.GITHUB_TOKEN = inputs.token;
-    if (inputs.title) process.env.CIFF_TITLE = inputs.title;
-    if (inputs.contentFilepath) process.env.CIFF_CONTENT_FILEPATH = inputs.contentFilepath;
-    if (inputs.labels) process.env.CIFF_LABELS = inputs.labels;
-    if (inputs.assignees) process.env.CIFF_ASSIGNEES = inputs.assignees;
-    if (inputs.project) process.env.CIFF_PROJECT_NAME = inputs.project;
-    if (inputs.projectColumn) process.env.CIFF_PROJECT_COLUMN_NAME = inputs.projectColumn;
-
-    // Execute python script
-    await exec.exec("python", [`${src}/create_issue_from_file.py`]);
-  } catch (error) {
-    core.setFailed(error.message);
-  }
-}
-
-run();
-
-
-/***/ }),
-
-/***/ 129:
-/***/ (function(module) {
-
-module.exports = require("child_process");
-
-/***/ }),
-
-/***/ 139:
 /***/ (function(module, __unusedexports, __webpack_require__) {
 
 const core = __webpack_require__(470);
@@ -1120,6 +1039,28 @@ let setupPython = function(versionSpec, arch) {
 module.exports = setupPython;
 
 
+/***/ }),
+
+/***/ 129:
+/***/ (function(module) {
+
+module.exports = require("child_process");
+
+/***/ }),
+
+/***/ 139:
+/***/ (function(module, __unusedexports, __webpack_require__) {
+
+// Unique ID creation requires a high quality random # generator.  In node.js
+// this is pretty straight-forward - we use the crypto API.
+
+var crypto = __webpack_require__(417);
+
+module.exports = function nodeRNG() {
+  return crypto.randomBytes(16);
+};
+
+
 /***/ }),
 
 /***/ 141:
@@ -1375,6 +1316,43 @@ if (process.env.NODE_DEBUG && /\btunnel\b/.test(process.env.NODE_DEBUG)) {
 exports.debug = debug; // for test
 
 
+/***/ }),
+
+/***/ 160:
+/***/ (function(module, __unusedexports, __webpack_require__) {
+
+"use strict";
+
+const fs = __webpack_require__(747);
+
+let isDocker;
+
+function hasDockerEnv() {
+	try {
+		fs.statSync('/.dockerenv');
+		return true;
+	} catch (_) {
+		return false;
+	}
+}
+
+function hasDockerCGroup() {
+	try {
+		return fs.readFileSync('/proc/self/cgroup', 'utf8').includes('docker');
+	} catch (_) {
+		return false;
+	}
+}
+
+module.exports = () => {
+	if (isDocker === undefined) {
+		isDocker = hasDockerEnv() || hasDockerCGroup();
+	}
+
+	return isDocker;
+};
+
+
 /***/ }),
 
 /***/ 211:
@@ -4227,6 +4205,84 @@ function isUnixExecutable(stats) {
 }
 //# sourceMappingURL=io-util.js.map
 
+/***/ }),
+
+/***/ 676:
+/***/ (function(__unusedmodule, __unusedexports, __webpack_require__) {
+
+const { inspect } = __webpack_require__(669);
+const isDocker = __webpack_require__(160);
+const core = __webpack_require__(470);
+const exec = __webpack_require__(986);
+const setupPython = __webpack_require__(104);
+
+async function run() {
+  try {
+    // Allows ncc to find assets to be included in the distribution
+    const ciff = __webpack_require__.ab + "ciff";
+    core.debug(`ciff: ${ciff}`);
+
+    // Determine how to access python and pip
+    const { pip, python } = (function() {
+      if (isDocker()) {
+        core.info("Running inside a Docker container");
+        // Python 3 assumed to be installed and on the PATH
+        return {
+          pip: "pip3",
+          python: "python3"
+        };
+      } else {
+        // Setup Python from the tool cache
+        setupPython("3.x", "x64");
+        return {
+          pip: "pip",
+          python: "python"
+        };
+      }
+    })();
+
+    // Install requirements
+    await exec.exec(pip, [
+      "install",
+      "--requirement",
+      `${ciff}/requirements.txt`,
+      "--no-index",
+      `--find-links=${__dirname}/vendor`
+    ]);
+
+    // Fetch action inputs
+    const inputs = {
+      token: core.getInput("token"),
+      issueNumber: core.getInput("issue-number"),
+      title: core.getInput("title"),
+      contentFilepath: core.getInput("content-filepath"),
+      labels: core.getInput("labels"),
+      assignees: core.getInput("assignees"),
+      project: core.getInput("project"),
+      projectColumn: core.getInput("project-column")
+    };
+    core.debug(`Inputs: ${inspect(inputs)}`);
+
+    // Set environment variables from inputs.
+    if (inputs.token) process.env.GITHUB_TOKEN = inputs.token;
+    if (inputs.issueNumber) process.env.CIFF_ISSUE_NUMBER = inputs.issueNumber;
+    if (inputs.title) process.env.CIFF_TITLE = inputs.title;
+    if (inputs.contentFilepath) process.env.CIFF_CONTENT_FILEPATH = inputs.contentFilepath;
+    if (inputs.labels) process.env.CIFF_LABELS = inputs.labels;
+    if (inputs.assignees) process.env.CIFF_ASSIGNEES = inputs.assignees;
+    if (inputs.project) process.env.CIFF_PROJECT_NAME = inputs.project;
+    if (inputs.projectColumn) process.env.CIFF_PROJECT_COLUMN_NAME = inputs.projectColumn;
+
+    // Execute create issue from file
+    await exec.exec(python, [`${ciff}/create_issue_from_file.py`]);
+  } catch (error) {
+    core.setFailed(error.message);
+  }
+}
+
+run();
+
+
 /***/ }),
 
 /***/ 722:
@@ -4659,7 +4715,7 @@ module.exports = require("zlib");
 /***/ 826:
 /***/ (function(module, __unusedexports, __webpack_require__) {
 
-var rng = __webpack_require__(58);
+var rng = __webpack_require__(139);
 var bytesToUuid = __webpack_require__(722);
 
 function v4(options, buf, offset) {
diff --git a/dist/src/requirements.txt b/dist/src/requirements.txt
deleted file mode 100644
index 4359e250..00000000
--- a/dist/src/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-PyGithub==1.47
diff --git a/dist/src/setup-python.js b/dist/src/setup-python.js
deleted file mode 100644
index d93a55aa..00000000
--- a/dist/src/setup-python.js
+++ /dev/null
@@ -1,52 +0,0 @@
-const core = require("@actions/core");
-const tc = require("@actions/tool-cache");
-const path = require("path");
-const semver = require("semver");
-
-/**
- * Setup for Python from the GitHub Actions tool cache
- * Converted from https://github.com/actions/setup-python
- *
- * @param {string} versionSpec version of Python
- * @param {string} arch architecture (x64|x32)
- */
-let setupPython = function(versionSpec, arch) {
-  return new Promise((resolve, reject) => {
-    const IS_WINDOWS = process.platform === "win32";
-
-    // Find the version of Python we want in the tool cache
-    const installDir = tc.find("Python", versionSpec, arch);
-    core.debug(`installDir: ${installDir}`);
-
-    // Set paths
-    core.exportVariable("pythonLocation", installDir);
-    core.addPath(installDir);
-    if (IS_WINDOWS) {
-      core.addPath(path.join(installDir, "Scripts"));
-    } else {
-      core.addPath(path.join(installDir, "bin"));
-    }
-
-    if (IS_WINDOWS) {
-      // Add --user directory
-      // `installDir` from tool cache should look like $AGENT_TOOLSDIRECTORY/Python/<semantic version>/x64/
-      // So if `findLocalTool` succeeded above, we must have a conformant `installDir`
-      const version = path.basename(path.dirname(installDir));
-      const major = semver.major(version);
-      const minor = semver.minor(version);
-
-      const userScriptsDir = path.join(
-        process.env["APPDATA"] || "",
-        "Python",
-        `Python${major}${minor}`,
-        "Scripts"
-      );
-      core.addPath(userScriptsDir);
-    }
-    // On Linux and macOS, pip will create the --user directory and add it to PATH as needed.
-
-    resolve();
-  });
-};
-
-module.exports = setupPython;
diff --git a/dist/vendor/Deprecated-1.2.7.tar.gz b/dist/vendor/Deprecated-1.2.9.tar.gz
similarity index 59%
rename from dist/vendor/Deprecated-1.2.7.tar.gz
rename to dist/vendor/Deprecated-1.2.9.tar.gz
index 6966c531..7ee02cea 100644
Binary files a/dist/vendor/Deprecated-1.2.7.tar.gz and b/dist/vendor/Deprecated-1.2.9.tar.gz differ
diff --git a/dist/vendor/certifi-2019.11.28.tar.gz b/dist/vendor/certifi-2019.11.28.tar.gz
deleted file mode 100644
index 278a8e87..00000000
Binary files a/dist/vendor/certifi-2019.11.28.tar.gz and /dev/null differ
diff --git a/dist/vendor/certifi-2020.4.5.1.tar.gz b/dist/vendor/certifi-2020.4.5.1.tar.gz
new file mode 100644
index 00000000..11408d47
Binary files /dev/null and b/dist/vendor/certifi-2020.4.5.1.tar.gz differ
diff --git a/dist/vendor/setuptools-46.1.3.zip b/dist/vendor/setuptools-46.1.3.zip
new file mode 100644
index 00000000..82fd9569
Binary files /dev/null and b/dist/vendor/setuptools-46.1.3.zip differ
diff --git a/dist/vendor/urllib3-1.25.8.tar.gz b/dist/vendor/urllib3-1.25.8.tar.gz
deleted file mode 100644
index 8f35a38f..00000000
Binary files a/dist/vendor/urllib3-1.25.8.tar.gz and /dev/null differ
diff --git a/dist/vendor/urllib3-1.25.9.tar.gz b/dist/vendor/urllib3-1.25.9.tar.gz
new file mode 100644
index 00000000..b20c9135
Binary files /dev/null and b/dist/vendor/urllib3-1.25.9.tar.gz differ
diff --git a/dist/vendor/wheel-0.34.2.tar.gz b/dist/vendor/wheel-0.34.2.tar.gz
new file mode 100644
index 00000000..d31f4fb0
Binary files /dev/null and b/dist/vendor/wheel-0.34.2.tar.gz differ
diff --git a/package-lock.json b/package-lock.json
index c5169324..108de670 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,6 +41,11 @@
       "integrity": "sha512-Qq3bMuonkcnV/96jhy9SQYdh39NXHxNMJ1O31ZFzWG9n52fR2DLtgrNzhj/ahlEjnBziMLGVWDbaS9sf03/fEw==",
       "dev": true
     },
+    "is-docker": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/is-docker/-/is-docker-2.0.0.tgz",
+      "integrity": "sha512-pJEdRugimx4fBMra5z2/5iRdZ63OhYV0vr0Dwm5+xtW4D1FvRkB8hamMIhnWfyJeDdyr/aa7BDyNbtG38VxgoQ=="
+    },
     "qs": {
       "version": "6.9.1",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.9.1.tgz",
diff --git a/package.json b/package.json
index 0018402e..b0bb306a 100644
--- a/package.json
+++ b/package.json
@@ -5,8 +5,8 @@
   "main": "index.js",
   "scripts": {
     "clean": "rm -rf dist",
-    "build": "ncc build index.js -o dist",
-    "vendor-deps": "pip download -r src/requirements.txt --no-binary=:all: -d dist/vendor",
+    "build": "ncc build src/index.js -o dist",
+    "vendor-deps": "pip download -r src/ciff/requirements.txt --no-binary=:all: -d dist/vendor",
     "package": "npm run build && npm run vendor-deps"
   },
   "repository": {
@@ -23,7 +23,8 @@
   "dependencies": {
     "@actions/core": "^1.1.1",
     "@actions/exec": "^1.0.1",
-    "@actions/tool-cache": "^1.1.2"
+    "@actions/tool-cache": "^1.1.2",
+    "is-docker": "^2.0.0"
   },
   "devDependencies": {
     "@zeit/ncc": "0.22.1"
diff --git a/src/create_issue_from_file.py b/src/ciff/create_issue_from_file.py
similarity index 56%
rename from src/create_issue_from_file.py
rename to src/ciff/create_issue_from_file.py
index b583d64c..0c529884 100755
--- a/src/create_issue_from_file.py
+++ b/src/ciff/create_issue_from_file.py
@@ -2,7 +2,7 @@
 ''' Create Issue From File '''
 import os
 from pathlib import Path
-from github import Github
+from github import Github, GithubException
 
 # Fetch required environment variables
 github_token = os.environ['GITHUB_TOKEN']
@@ -11,11 +11,44 @@
 issue_content_path = os.environ['CIFF_CONTENT_FILEPATH']
 
 # Fetch optional environment variables
+issue_number = os.environ.get('CIFF_ISSUE_NUMBER')
 issue_labels = os.environ.get('CIFF_LABELS')
 issue_assignees = os.environ.get('CIFF_ASSIGNEES')
 project_name = os.environ.get('CIFF_PROJECT_NAME')
 project_column_name = os.environ.get('CIFF_PROJECT_COLUMN_NAME')
 
+
+def create_project_card(github_repo, project_name, project_column_name, issue):
+    # Locate the project by name
+    project = None
+    for project_item in github_repo.get_projects("all"):
+        if project_item.name == project_name:
+            project = project_item
+            break
+
+    if not project:
+        print("::error::Project not found. Unable to create project card.")
+        return
+
+    # Locate the column by name
+    column = None
+    for column_item in project.get_columns():
+        if column_item.name == project_column_name:
+            column = column_item
+            break
+
+    if not column:
+        print("::error::Project column not found. Unable to create project card.")
+        return
+
+    # Create a project card for the pull request
+    column.create_card(content_id=issue.id, content_type="Issue")
+    print(
+        "Added issue #%d to project '%s' under column '%s'"
+        % (issue.number, project.name, column.name)
+    )
+
+
 # If the file does not exist there is no issue to create
 if not Path(issue_content_path).is_file():
     print("File not found")
@@ -28,9 +61,19 @@
 # Fetch the repository object
 g = Github(github_token)
 repo = g.get_repo(github_repository)
-# Create the issue
-issue = repo.create_issue(issue_title, issue_content)
-print("Created issue %d" % (issue.number))
+
+if issue_number is not None:
+    # Update an existing issue
+    issue = repo.get_issue(int(issue_number))
+    issue.edit(title=issue_title, body=issue_content)
+    print("Updated issue %d" % (issue.number))
+else:
+    # Create an issue
+    issue = repo.create_issue(title=issue_title, body=issue_content)
+    print("Created issue %d" % (issue.number))
+
+# Set the step output
+os.system(f"echo ::set-output name=issue-number::{issue.number}")
 
 if issue_labels is not None:
     # Split the labels input into a list
@@ -50,30 +93,17 @@
     print("Assigning issue to assignees")
     issue.edit(assignees=assignees_list)
 
+# Create a project card for the pull request
 if project_name is not None and project_column_name is not None:
-    # Locate the project by name
-    project = None
-    for project_item in repo.get_projects("all"):
-        if project_item.name == project_name:
-            project = project_item
-            break
-
-    if not project:
-        print("Project not found")
-        exit(0)
-
-    # Locate the column by name
-    column = None
-    for column_item in project.get_columns():
-        if column_item.name == project_column_name:
-            column = column_item
-            break
-
-    if not column:
-        print("Project column not found")
-        exit(0)
-
-    # Add the issue to the project
-    card = column.create_card(content_id=issue.id, content_type="Issue")
-    print("Added issue %d to project \"%s\" under column \"%s\"" \
-        % (issue.number, project.name, column.name))
\ No newline at end of file
+    try:
+        create_project_card(
+            repo, project_name, project_column_name, issue
+        )
+    except GithubException as e:
+        # Likely caused by "Project already has the associated issue."
+        if e.status == 422:
+            print(
+                "Create project card failed - {}".format(
+                    e.data["errors"][0]["message"]
+                )
+            )
diff --git a/src/ciff/requirements.txt b/src/ciff/requirements.txt
new file mode 100644
index 00000000..a6ad034e
--- /dev/null
+++ b/src/ciff/requirements.txt
@@ -0,0 +1,3 @@
+setuptools==46.1.3
+wheel==0.34.2
+PyGithub==1.47
diff --git a/index.js b/src/index.js
similarity index 59%
rename from index.js
rename to src/index.js
index 1ccce68b..6d9a1c26 100644
--- a/index.js
+++ b/src/index.js
@@ -1,22 +1,39 @@
 const { inspect } = require("util");
+const isDocker = require("is-docker");
 const core = require("@actions/core");
 const exec = require("@actions/exec");
-const setupPython = require("./src/setup-python");
+const setupPython = require("./setup-python");
 
 async function run() {
   try {
     // Allows ncc to find assets to be included in the distribution
-    const src = __dirname + "/src";
-    core.debug(`src: ${src}`);
+    const ciff = __dirname + "/ciff";
+    core.debug(`ciff: ${ciff}`);
 
-    // Setup Python from the tool cache
-    setupPython("3.8.x", "x64");
+    // Determine how to access python and pip
+    const { pip, python } = (function() {
+      if (isDocker()) {
+        core.info("Running inside a Docker container");
+        // Python 3 assumed to be installed and on the PATH
+        return {
+          pip: "pip3",
+          python: "python3"
+        };
+      } else {
+        // Setup Python from the tool cache
+        setupPython("3.x", "x64");
+        return {
+          pip: "pip",
+          python: "python"
+        };
+      }
+    })();
 
     // Install requirements
-    await exec.exec("pip", [
+    await exec.exec(pip, [
       "install",
       "--requirement",
-      `${src}/requirements.txt`,
+      `${ciff}/requirements.txt`,
       "--no-index",
       `--find-links=${__dirname}/vendor`
     ]);
@@ -24,6 +41,7 @@ async function run() {
     // Fetch action inputs
     const inputs = {
       token: core.getInput("token"),
+      issueNumber: core.getInput("issue-number"),
       title: core.getInput("title"),
       contentFilepath: core.getInput("content-filepath"),
       labels: core.getInput("labels"),
@@ -35,6 +53,7 @@ async function run() {
 
     // Set environment variables from inputs.
     if (inputs.token) process.env.GITHUB_TOKEN = inputs.token;
+    if (inputs.issueNumber) process.env.CIFF_ISSUE_NUMBER = inputs.issueNumber;
     if (inputs.title) process.env.CIFF_TITLE = inputs.title;
     if (inputs.contentFilepath) process.env.CIFF_CONTENT_FILEPATH = inputs.contentFilepath;
     if (inputs.labels) process.env.CIFF_LABELS = inputs.labels;
@@ -42,8 +61,8 @@ async function run() {
     if (inputs.project) process.env.CIFF_PROJECT_NAME = inputs.project;
     if (inputs.projectColumn) process.env.CIFF_PROJECT_COLUMN_NAME = inputs.projectColumn;
 
-    // Execute python script
-    await exec.exec("python", [`${src}/create_issue_from_file.py`]);
+    // Execute create issue from file
+    await exec.exec(python, [`${ciff}/create_issue_from_file.py`]);
   } catch (error) {
     core.setFailed(error.message);
   }
diff --git a/src/requirements.txt b/src/requirements.txt
deleted file mode 100644
index 4359e250..00000000
--- a/src/requirements.txt
+++ /dev/null
@@ -1 +0,0 @@
-PyGithub==1.47