diff --git a/CHANGELOG.md b/CHANGELOG.md
index 731ebca..295a6ea 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,12 @@
+## [4.0.0] - 2023-02-10
+### Changed
+- run and runString now return a promise instead of a using a callback.
+- This is somewhat backwards compatible with previous behavior
+
+## [3.0.1] - 2021-10-09
+### Fixed
+- Previously when you called the kill method the terminated attribute was always set to true, regardless of whether the process was actually killed. Now the terminated boolean is set to true if kill succeeds, false otherwise. [#255](https://github.com/extrabacon/python-shell/issues/255)
+
 ## [3.0.0] - 2021-03-07
 ### Changed
 - **BREAKING** Default python path changed back to `python` on Windows. [#237](https://github.com/extrabacon/python-shell/issues/237)
diff --git a/appveyor.yml b/appveyor.yml
index 5ea5534..d59efae 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -6,19 +6,24 @@ branches:
 
 image:
 - Visual Studio 2017
-- Ubuntu
+- Ubuntu2004
 
 environment:
   matrix:
-    - nodejs_version: "10"
-      PYTHON: "C:\\Python36-x64"
 
-    - nodejs_version: "12"
-      PYTHON: "C:\\Python36-x64"
+    - nodejs_version: "14"
+      PYTHON: "C:\\Python37-x64"
+
+    - nodejs_version: "16"
+      PYTHON: "C:\\Python37-x64"
+      
+    - nodejs_version: "18"
+      PYTHON: "C:\\Python37-x64"
   
 install:
   - cmd: powershell Install-Product node $env:nodejs_version
   - sh: nvm install $nodejs_version
+  - node --version
   - npm install
   - npm install codecov -g
   - npm install nyc -g
diff --git a/index.ts b/index.ts
index 44209e6..634232b 100644
--- a/index.ts
+++ b/index.ts
@@ -46,7 +46,7 @@ export interface Options extends SpawnOptions {
     formatter?: string | ((param: string) => any)
     parser?: string | ((param: string) => any)
     stderrParser?: string | ((param: string) => any)
-    encoding?: string
+    encoding?: BufferEncoding
     pythonPath?: string
     /**
      * see https://docs.python.org/3.7/using/cmdline.html
@@ -309,10 +309,32 @@ export class PythonShell extends EventEmitter {
      * Runs a Python script and returns collected messages
      * @param  {string}   scriptPath   The path to the script to execute
      * @param  {Options}   options  The execution options
-     * @param  {Function} callback The callback function to invoke with the script results
-     * @return {PythonShell}       The PythonShell instance
+     * @param  {Function} (deprecated argument) callback The callback function to invoke with the script results
+     * @return {Promise<string[]> | PythonShell}  the output from the python script
      */
-    static run(scriptPath: string, options?: Options, callback?: (err?: PythonShellError, output?: any[]) => any) {
+     static run(scriptPath: string, options?: Options, callback?: (err?: PythonShellError, output?: any[]) => any) {
+
+        if(callback) {
+            console.warn('PythonShell.run() callback is deprecated. Use PythonShell.run() promise instead.')
+
+            return this.runLegacy(scriptPath, options, callback);
+        }
+        else {
+            return new Promise((resolve, reject) => {
+                let pyshell = new PythonShell(scriptPath, options);
+                let output = [];
+
+                pyshell.on('message', function (message) {
+                    output.push(message);
+                }).end(function (err) {
+                    if(err) reject(err);
+                    else resolve(output);
+                });
+            });
+        }
+    };
+
+    private static runLegacy(scriptPath: string, options?: Options, callback?: (err?: PythonShellError, output?: any[]) => any) {
         let pyshell = new PythonShell(scriptPath, options);
         let output = [];
 
@@ -323,6 +345,8 @@ export class PythonShell extends EventEmitter {
         });
     };
 
+
+
     /**
      * Runs the inputted string of python code and returns collected messages. DO NOT ALLOW UNTRUSTED USER INPUT HERE!
      * @param  {string}   code   The python code to execute
@@ -330,7 +354,7 @@ export class PythonShell extends EventEmitter {
      * @param  {Function} callback The callback function to invoke with the script results
      * @return {PythonShell}       The PythonShell instance
      */
-    static runString(code: string, options?: Options, callback?: (err: PythonShellError, output?: any[]) => any) {
+     static runString(code: string, options?: Options, callback?: (err: PythonShellError, output?: any[]) => any) {
 
         // put code in temp file
         const randomInt = getRandomInt();
@@ -407,8 +431,7 @@ export class PythonShell extends EventEmitter {
      * @returns {PythonShell} The same instance for chaining calls
      */
     kill(signal?: NodeJS.Signals) {
-        this.childProcess.kill(signal);
-        this.terminated = true;
+        this.terminated = this.childProcess.kill(signal);
         return this;
     };
 
diff --git a/package-lock.json b/package-lock.json
index 3a732f1..14981de 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,1714 @@
 {
   "name": "python-shell",
-  "version": "3.0.0",
-  "lockfileVersion": 1,
+  "version": "4.0.0",
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "python-shell",
+      "version": "4.0.0",
+      "license": "MIT",
+      "devDependencies": {
+        "@types/mocha": "^8.2.1",
+        "@types/node": "^14.17.21",
+        "@types/should": "^13.0.0",
+        "mocha": "^8.2.1",
+        "mocha-appveyor-reporter": "^0.4.0",
+        "should": "^13.2.1",
+        "ts-node": "^9.0.0",
+        "typescript": "^4.4.3"
+      },
+      "engines": {
+        "node": ">=0.10"
+      }
+    },
+    "node_modules/@types/mocha": {
+      "version": "8.2.1",
+      "resolved": "https://registry.npmjs.org/@types/mocha/-/mocha-8.2.1.tgz",
+      "integrity": "sha512-NysN+bNqj6E0Hv4CTGWSlPzMW6vTKjDpOteycDkV4IWBsO+PU48JonrPzV9ODjiI2XrjmA05KInLgF5ivZ/YGQ==",
+      "dev": true
+    },
+    "node_modules/@types/node": {
+      "version": "14.17.21",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.17.21.tgz",
+      "integrity": "sha512-zv8ukKci1mrILYiQOwGSV4FpkZhyxQtuFWGya2GujWg+zVAeRQ4qbaMmWp9vb9889CFA8JECH7lkwCL6Ygg8kA==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@types/should": {
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/@types/should/-/should-13.0.0.tgz",
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+      "deprecated": "This is a stub types definition for should.js (https://github.com/shouldjs/should.js). should.js provides its own type definitions, so you don't need @types/should installed!",
+      "dev": true,
+      "dependencies": {
+        "should": "*"
+      }
+    },
+    "node_modules/@ungap/promise-all-settled": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
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+      }
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+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/@types/should/-/should-13.0.0.tgz",
+      "integrity": "sha512-Mi6YZ2ABnnGGFMuiBDP0a8s1ZDCDNHqP97UH8TyDmCWuGGavpsFMfJnAMYaaqmDlSCOCNbVLHBrSDEOpx/oLhw==",
+      "dev": true,
+      "requires": {
+        "should": "*"
+      }
+    },
     "@ungap/promise-all-settled": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
@@ -709,11 +2424,6 @@
         "verror": "1.10.0"
       }
     },
-    "line-transform-stream": {
-      "version": "0.1.0",
-      "resolved": "https://registry.npmjs.org/line-transform-stream/-/line-transform-stream-0.1.0.tgz",
-      "integrity": "sha1-Hvhnmsy/cbBkREwroTsheFs+vXg="
-    },
     "locate-path": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
@@ -1168,9 +2878,9 @@
       "optional": true
     },
     "typescript": {
-      "version": "3.9.7",
-      "resolved": "https://registry.npmjs.org/typescript/-/typescript-3.9.7.tgz",
-      "integrity": "sha512-BLbiRkiBzAwsjut4x/dsibSTB6yWpwT5qWmC2OfuCg3GgVQCSgMs4vEctYPhsaGtd0AeuuHMkjZ2h2WG8MSzRw==",
+      "version": "4.4.3",
+      "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.4.3.tgz",
+      "integrity": "sha512-4xfscpisVgqqDfPaJo5vkd+Qd/ItkoagnHpufr+i2QCHBsNYp+G7UAoyFl8aPtx879u38wPV65rZ8qbGZijalA==",
       "dev": true
     },
     "uuid": {
diff --git a/package.json b/package.json
index a8a30df..ede5a33 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "python-shell",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "description": "Run Python scripts from Node.js with simple (but efficient) inter-process communication through stdio",
   "keywords": [
     "python"
@@ -12,13 +12,13 @@
   },
   "devDependencies": {
     "@types/mocha": "^8.2.1",
-    "@types/node": "^10.5.2",
+    "@types/node": "^14.17.21",
     "@types/should": "^13.0.0",
     "mocha": "^8.2.1",
     "mocha-appveyor-reporter": "^0.4.0",
     "should": "^13.2.1",
     "ts-node": "^9.0.0",
-    "typescript": "^3.8.3"
+    "typescript": "^4.4.3"
   },
   "files": [
     "*.d.ts",
diff --git a/test/test-python-shell.ts b/test/test-python-shell.ts
index 3016eb2..947e287 100644
--- a/test/test-python-shell.ts
+++ b/test/test-python-shell.ts
@@ -117,13 +117,20 @@ describe('PythonShell', function () {
         before(() => {
             PythonShell.defaultOptions = {};
         })
-        it('should be able to execute a string of python code', function (done) {
-            PythonShell.runString('print("hello");print("world")', null, function (err, results) {
+        it('should be able to execute a string of python code using callbacks', function (done) {
+            let pythonshell = PythonShell.runString('print("hello");print("world")', null, function (err, results) {
                 if (err) return done(err);
                 results.should.be.an.Array().and.have.lengthOf(2);
                 results.should.eql(['hello', 'world']);
                 done();
             });
+
+            pythonshell.should.be.an.instanceOf(PythonShell);
+        });
+        it('should be able to execute a string of python code using promises', async function () {
+            let results = await PythonShell.runString('print("hello");print("world")');
+            results.should.be.an.Array().and.have.lengthOf(2);
+            results.should.eql(['hello', 'world']);
         });
         after(() => {
             PythonShell.defaultOptions = {
@@ -134,7 +141,7 @@ describe('PythonShell', function () {
     });
 
     describe('#run(script, options)', function () {
-        it('should run the script and return output data', function (done) {
+        it('should run the script and return output data using callbacks', function (done) {
             PythonShell.run('echo_args.py', {
                 args: ['hello', 'world']
             }, function (err, results) {
@@ -144,6 +151,13 @@ describe('PythonShell', function () {
                 done();
             });
         });
+        it('should run the script and return output data using promise', async function () {
+            let results = await PythonShell.run('echo_args.py', {
+                args: ['hello', 'world']
+            });
+            results.should.be.an.Array().and.have.lengthOf(2);
+            results.should.eql(['hello', 'world']);
+        });
         it('should try to run the script and fail appropriately', function (done) {
             PythonShell.run('unknown_script.py', null, function (err, results) {
                 err.should.be.an.Error;
@@ -151,6 +165,15 @@ describe('PythonShell', function () {
                 done();
             });
         });
+        it('should try to run the script and fail appropriately', async function () {
+            try {
+                let results = await PythonShell.run('unknown_script.py');
+                throw new Error(`should not get here because the script should fail` + results);
+            } catch (err) {
+                err.should.be.an.Error;
+                err.exitCode.should.be.exactly(2);
+            }
+        });
         it('should include both output and error', function (done) {
             PythonShell.run('echo_hi_then_error.py', null, function (err, results) {
                 err.should.be.an.Error;
@@ -250,8 +273,8 @@ describe('PythonShell', function () {
             };
         })
 
-        it('should run PythonShell normally without access to std streams', function (done) {
-            var pyshell = PythonShell.run('exit-code.py', {
+        it('should run PythonShell normally without access to std streams', async function () {
+            var pyshell = await PythonShell.run('exit-code.py', {
                 // 3 different ways of assigning values to the std streams in child_process.spawn()
                 // * ignore - pipe to /dev/null
                 // * inherit - inherit fd from parent process;
@@ -261,12 +284,10 @@ describe('PythonShell', function () {
                 // although the user shouldn't be doing this. We are just testing for
                 // increased code coverage
                 args: "0"
-            }, done);
+            });
 
-            should(pyshell.stdin).be.eql(null);
-            should(pyshell.stdout).be.eql(null);
-            should(pyshell.stderr).be.eql(null);
-            should.throws(() => { pyshell.send("asd") });
+            should(pyshell).be.eql([]);
+            
         });
     });
 
@@ -517,33 +538,29 @@ describe('PythonShell', function () {
         });
     });
 
-    describe('.terminate()', function () {
-        it('set terminated to true', function (done) {
+    describe('.kill()', function () {
+        it('set terminated to correct value', function (done) {
             let pyshell = new PythonShell('infinite_loop.py');
-            pyshell.terminate();
+            pyshell.kill();
             pyshell.terminated.should.be.true
             done();
         });
         it('run the end callback if specified', function (done) {
             let pyshell = new PythonShell('infinite_loop.py');
-            let endCalled = false;
             pyshell.end(() => {
-                endCalled = true;
+                done();
             })
-            pyshell.terminate();
-            pyshell.terminated.should.be.true
-            done();
+            pyshell.kill();
         });
-        it('terminate with correct kill signal', function (done) {
+        it('kill with correct signal', function (done) {
             let pyshell = new PythonShell('infinite_loop.py');
-            let endCalled = false;
-            pyshell.end(() => {
-                endCalled = true;
-            })
-            pyshell.terminate('SIGKILL');
+            pyshell.terminated.should.be.false;
+            pyshell.kill('SIGKILL');
             pyshell.terminated.should.be.true;
-            setTimeout(() => { pyshell.exitSignal.should.be.exactly('SIGKILL'); }, 500);
-            done();
+            setTimeout(() => {
+                pyshell.exitSignal.should.be.exactly('SIGKILL');
+                done();
+            }, 500);
         });
     });
 });