diff --git a/@types/ol/Observable.d.ts b/@types/ol/Observable.d.ts
index e713c85b..0ba7a5ba 100644
--- a/@types/ol/Observable.d.ts
+++ b/@types/ol/Observable.d.ts
@@ -5,12 +5,12 @@ import Target from './events/Target';
 export type EventTypes = 'change' | 'error';
 export default class Observable extends Target {
     constructor();
-    protected onceInternal(type: string | string[], listener: (p0: any) => void | boolean): EventsKey | EventsKey[];
-    protected onInternal(type: string | string[], listener: (p0: any) => void | boolean): EventsKey | EventsKey[];
+    protected onceInternal(type: string | string[], listener: (p0: any) => any): EventsKey | EventsKey[];
+    protected onInternal(type: string | string[], listener: (p0: any) => any): EventsKey | EventsKey[];
     /**
      * Unlisten for a certain type of event.
      */
-    protected unInternal(type: string | string[], listener: (p0: any) => void | boolean): void;
+    protected unInternal(type: string | string[], listener: (p0: any) => any): void;
     /**
      * Increases the revision counter and dispatches a 'change' event.
      */
diff --git a/@types/ol/PluggableMap.d.ts b/@types/ol/PluggableMap.d.ts
index 9b2ac0d1..57811c29 100644
--- a/@types/ol/PluggableMap.d.ts
+++ b/@types/ol/PluggableMap.d.ts
@@ -291,7 +291,7 @@ export default class PluggableMap extends BaseObject {
     /**
      * Set the target element to render this map into.
      */
-    setTarget(target: HTMLElement | string | undefined): void;
+    setTarget(target?: HTMLElement | string): void;
     /**
      * Set the view for this map.
      */
diff --git a/@types/ol/source/VectorEventType.d.ts b/@types/ol/source/VectorEventType.d.ts
index b6a174c9..6aa3356c 100644
--- a/@types/ol/source/VectorEventType.d.ts
+++ b/@types/ol/source/VectorEventType.d.ts
@@ -1,5 +1,6 @@
 export type VectorSourceEventTypes =
     | 'addfeature'
+    | 'changefeature'
     | 'clear'
     | 'removefeature'
     | 'featuresloadstart'
diff --git a/@types/ol/style/RegularShape.d.ts b/@types/ol/style/RegularShape.d.ts
index f9bef700..cec6e4f0 100644
--- a/@types/ol/style/RegularShape.d.ts
+++ b/@types/ol/style/RegularShape.d.ts
@@ -26,7 +26,6 @@ export interface RenderOptions {
     strokeStyle?: ColorLike;
     strokeWidth: number;
     size: number;
-    lineCap: CanvasLineCap;
     lineDash: number[];
     lineDashOffset: number;
     lineJoin: CanvasLineJoin;
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 13e68bfd..a763f182 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Changelog
 
+- **v3.6.1**
+  - Updated to OpenLayers v6.6.1
 - **v3.6.0**
   - Updated to OpenLayers v6.6.0
 - **v3.5.4**
diff --git a/package.json b/package.json
index 9599d6f9..1942ed77 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hanreev/types-ol",
-  "version": "3.6.1",
+  "version": "3.6.2",
   "description": "OpenLayers 6+ TypeScript definition",
   "author": "Rifa'i M. Hanif <hanreev@gmail.com>",
   "repository": {
@@ -36,10 +36,10 @@
     "test": "webpack --progress --color"
   },
   "dependencies": {
-    "@types/arcgis-rest-api": "^10.4.4",
-    "@types/geojson": "^7946.0.7",
+    "@types/arcgis-rest-api": "^10.4.5",
+    "@types/geojson": "^7946.0.8",
     "@types/pbf": "^3.0.2",
-    "@types/topojson-specification": "^1.0.1"
+    "@types/topojson-specification": "^1.0.2"
   },
   "devDependencies": {
     "@definitelytyped/definitions-parser": "0.0.85",
@@ -48,7 +48,7 @@
     "@types/fs-extra": "^9.0.11",
     "@types/glob": "^7.1.1",
     "@types/marked": "^2.0.3",
-    "@types/node": "^16.3.1",
+    "@types/node": "^16.3.2",
     "@types/proj4": "^2.5.0",
     "@types/rbush": "^3.0.0",
     "@typescript-eslint/eslint-plugin": "^4.28.3",
@@ -61,8 +61,8 @@
     "jsdoc": "^3.6.7",
     "jsdoc-plugin-typescript": "2.0.6",
     "no-emit-webpack-plugin": "^4.0.1",
-    "node-html-parser": "^4.0.0",
-    "ol": "^6.6.0",
+    "node-html-parser": "^4.1.0",
+    "ol": "^6.6.1",
     "pinst": "^2.1.6",
     "prettier": "latest",
     "pretty-quick": "latest",
diff --git a/patches/ol-Observable.patch b/patches/ol-Observable.patch
index c444065f..2f9bebe5 100644
--- a/patches/ol-Observable.patch
+++ b/patches/ol-Observable.patch
@@ -1,12 +1,12 @@
 diff --git a/src/ol/Observable.js b/src/ol/Observable.js
-index 0ece19881..9cb17ab48 100644
+index 47d3d7b25..9baf411d1 100644
 --- a/src/ol/Observable.js
 +++ b/src/ol/Observable.js
 @@ -146,7 +146,7 @@ class Observable extends EventTarget {
   * Listen for a certain type of event.
   * @function
   * @param {string|Array<string>} type The event type or array of event types.
-- * @param {function((Event|import("./events/Event").default)): (void|boolean)} listener The listener function.
+- * @param {function((Event|import("./events/Event").default)): ?} listener The listener function.
 + * @param {import("./events.js").ListenerFunction} listener The listener function.
   * @return {import("./events.js").EventsKey|Array<import("./events.js").EventsKey>} Unique key for the listener. If
   *     called with an array of event types as the first argument, the return
@@ -15,7 +15,7 @@ index 0ece19881..9cb17ab48 100644
   * Listen once for a certain type of event.
   * @function
   * @param {string|Array<string>} type The event type or array of event types.
-- * @param {function((Event|import("./events/Event").default)): (void|boolean)} listener The listener function.
+- * @param {function((Event|import("./events/Event").default)): ?} listener The listener function.
 + * @param {import("./events.js").ListenerFunction} listener The listener function.
   * @return {import("./events.js").EventsKey|Array<import("./events.js").EventsKey>} Unique key for the listener. If
   *     called with an array of event types as the first argument, the return
@@ -24,7 +24,7 @@ index 0ece19881..9cb17ab48 100644
   * Unlisten for a certain type of event.
   * @function
   * @param {string|Array<string>} type The event type or array of event types.
-- * @param {function((Event|import("./events/Event").default)): (void|boolean)} listener The listener function.
+- * @param {function((Event|import("./events/Event").default)): ?} listener The listener function.
 + * @param {import("./events.js").ListenerFunction} listener The listener function.
   * @api
   */
diff --git a/scripts/applyPatches.js b/scripts/applyPatches.js
index c439a209..d496d373 100644
--- a/scripts/applyPatches.js
+++ b/scripts/applyPatches.js
@@ -4,7 +4,7 @@ const glob = require('glob');
 const childProcess = require('child_process');
 
 const BASE_DIR = process.cwd();
-const OL_VERSION = 'v6.6.0';
+const OL_VERSION = 'v6.6.1';
 
 const jsdocConfigPath = path.resolve(BASE_DIR, 'jsdoc', 'conf.json');
 const jsdocConfig = require(jsdocConfigPath);
diff --git a/scripts/prepareNpm.js b/scripts/prepareNpm.js
index 2a0bd997..4876d168 100644
--- a/scripts/prepareNpm.js
+++ b/scripts/prepareNpm.js
@@ -37,4 +37,17 @@ childProcess.execSync('yarn test', { stdio: 'ignore' });
 console.log('# Emitting definitions to output directory');
 fs.copySync(srcPath, destPath);
 
+// Add package.json
+console.log('# Copying package.json');
+const packageJsonPath = path.resolve(BASE_DIR, 'package.json');
+const packageJsonDestPath = path.join(destPath, 'package.json');
+
+const src = require(packageJsonPath);
+delete src.scripts;
+delete src.devDependencies;
+delete src.files;
+delete src.husky;
+
+fs.writeFileSync(packageJsonDestPath, JSON.stringify(src, null, 4));
+
 console.log('# DONE');
diff --git a/yarn.lock b/yarn.lock
index c250b5c5..15f7b36f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -385,7 +385,7 @@
     lodash "4.17.21"
     prettier "2.2.1"
 
-"@types/arcgis-rest-api@^10.4.4":
+"@types/arcgis-rest-api@^10.4.5":
   version "10.4.5"
   resolved "https://registry.yarnpkg.com/@types/arcgis-rest-api/-/arcgis-rest-api-10.4.5.tgz#35a1d6b1b39bb530b36799d679576cbc1f35cc2e"
   integrity sha512-MhpTj3aaURIFhK6pBRF50yCHW5TpbeuC1E81juovfNesSOshsQnCzludhpBhIr2pNzplTBlfzrT7RKiLZ5F3Tw==
@@ -418,7 +418,7 @@
   dependencies:
     "@types/node" "*"
 
-"@types/geojson@*", "@types/geojson@^7946.0.7":
+"@types/geojson@*", "@types/geojson@^7946.0.8":
   version "7946.0.8"
   resolved "https://registry.yarnpkg.com/@types/geojson/-/geojson-7946.0.8.tgz#30744afdb385e2945e22f3b033f897f76b1f12ca"
   integrity sha512-1rkryxURpr6aWP7R786/UQOkJ3PcpQiWkAXBmdWc7ryFWqN6a4xfK7BtjXvFBKO9LjQ+MWQSWxYeZX1OApnArA==
@@ -451,7 +451,7 @@
   resolved "https://registry.yarnpkg.com/@types/minimatch/-/minimatch-3.0.5.tgz#1001cc5e6a3704b83c236027e77f2f58ea010f40"
   integrity sha512-Klz949h02Gz2uZCMGwDUSDS1YBlTdDDgbWHi+81l29tQALUtvz4rAYi5uoVhE5Lagoq6DeqAUlbrHvW/mXDgdQ==
 
-"@types/node@*", "@types/node@^16.3.1":
+"@types/node@*":
   version "16.3.1"
   resolved "https://registry.yarnpkg.com/@types/node/-/node-16.3.1.tgz#24691fa2b0c3ec8c0d34bfcfd495edac5593ebb4"
   integrity sha512-N87VuQi7HEeRJkhzovao/JviiqKjDKMVKxKMfUvSKw+MbkbW8R0nA3fi/MQhhlxV2fQ+2ReM+/Nt4efdrJx3zA==
@@ -461,6 +461,11 @@
   resolved "https://registry.yarnpkg.com/@types/node/-/node-14.17.5.tgz#b59daf6a7ffa461b5648456ca59050ba8e40ed54"
   integrity sha512-bjqH2cX/O33jXT/UmReo2pM7DIJREPMnarixbQ57DOOzzFaI6D2+IcwaJQaJpv0M1E9TIhPCYVxrkcityLjlqA==
 
+"@types/node@^16.3.2":
+  version "16.3.2"
+  resolved "https://registry.yarnpkg.com/@types/node/-/node-16.3.2.tgz#655432817f83b51ac869c2d51dd8305fb8342e16"
+  integrity sha512-jJs9ErFLP403I+hMLGnqDRWT0RYKSvArxuBVh2veudHV7ifEC1WAmjJADacZ7mRbA2nWgHtn8xyECMAot0SkAw==
+
 "@types/parsimmon@^1.10.1":
   version "1.10.6"
   resolved "https://registry.yarnpkg.com/@types/parsimmon/-/parsimmon-1.10.6.tgz#8fcf95990514d2a7624aa5f630c13bf2427f9cdd"
@@ -481,7 +486,7 @@
   resolved "https://registry.yarnpkg.com/@types/rbush/-/rbush-3.0.0.tgz#b6887d99b159e87ae23cd14eceff34f139842aa6"
   integrity sha512-W3ue/GYWXBOpkRm0VSoifrP3HV0Ni47aVJWvXyWMcbtpBy/l/K/smBRiJ+fI8f7shXRjZBiux+iJzYbh7VmcZg==
 
-"@types/topojson-specification@^1.0.1":
+"@types/topojson-specification@^1.0.2":
   version "1.0.2"
   resolved "https://registry.yarnpkg.com/@types/topojson-specification/-/topojson-specification-1.0.2.tgz#e20df2c5a611e31f51d606473dbaccc1d90461c8"
   integrity sha512-SGc1NdX9g3UGDp6S+p+uyG+Z8CehS51sUJ9bejA25Xgn2kkAguILk6J9nxXK+0M/mbTBN7ypMA7+4HVLNMJ8ag==
@@ -2491,10 +2496,10 @@ no-emit-webpack-plugin@^4.0.1:
   dependencies:
     schema-utils "^3.0.0"
 
-node-html-parser@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/node-html-parser/-/node-html-parser-4.0.0.tgz#95e4fec010c48425821d5659eaf39e27b0781b6d"
-  integrity sha512-vuOcp3u4GrfYOcqe+FpUffQKnfVBq781MbtFEcTR6fJYnYRE2qUPdDaDk7TGdq6H9r2B3TbyU6K9Rah6/C7qvg==
+node-html-parser@^4.1.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/node-html-parser/-/node-html-parser-4.1.0.tgz#9c23130609e203030113255c519ff2d3fbbfc439"
+  integrity sha512-sqSaqyrg1mqsRTl0r0h4UVAHBoW605rSpanOz0Yr7NzERl0fJ1eh6CRoZFcIXEIyzD3QJfGqsIMP+kzkViTiAA==
   dependencies:
     css-select "^4.1.3"
     he "1.2.0"
@@ -2611,10 +2616,10 @@ ol-mapbox-style@^6.4.1:
     mapbox-to-css-font "^2.4.0"
     webfont-matcher "^1.1.0"
 
-ol@^6.6.0:
-  version "6.6.0"
-  resolved "https://registry.yarnpkg.com/ol/-/ol-6.6.0.tgz#04c93dda422b22b4b0a9374bf86602bfb60401cd"
-  integrity sha512-4kJM5JKNRlOJnF2ndIoD4qpFmnoYQ8n+Q2qj6u6q63O4yDIrGHombea2OGrrlDPn1kLlKdCPLce8Vams1VIqow==
+ol@^6.6.1:
+  version "6.6.1"
+  resolved "https://registry.yarnpkg.com/ol/-/ol-6.6.1.tgz#eba3b2bd5c2f6d4f24f4ddcb713523bd3a13234f"
+  integrity sha512-QHNth7ty7UAPi5oEL5N5rJB/cgdFGAAzigYEM8LTUKCq/StTOTWDf2fFrom3wQVmsr1etf6i6hTBowtY/LiGgg==
   dependencies:
     ol-mapbox-style "^6.4.1"
     pbf "3.2.1"