diff --git a/externs/olx.js b/externs/olx.js
index 205fe6f13f..0345ca8e1e 100644
--- a/externs/olx.js
+++ b/externs/olx.js
@@ -23,21 +23,6 @@ olx.CollectionOptions;
 olx.CollectionOptions.prototype.unique;
 
 
-/**
- * @typedef {{html: string,
- *     tileRanges: (Object.<string, Array.<ol.TileRange>>|undefined)}}
- */
-olx.AttributionOptions;
-
-
-/**
- * HTML markup for this attribution.
- * @type {string}
- * @api
- */
-olx.AttributionOptions.prototype.html;
-
-
 /**
  * @typedef {{tracking: (boolean|undefined),
  *     trackingOptions: (GeolocationPositionOptions|undefined),
diff --git a/src/ol/Attribution.js b/src/ol/Attribution.js
deleted file mode 100644
index 9a4484589d..0000000000
--- a/src/ol/Attribution.js
+++ /dev/null
@@ -1,99 +0,0 @@
-/**
- * @module ol/Attribution
- */
-import _ol_TileRange_ from './TileRange.js';
-import _ol_math_ from './math.js';
-import _ol_tilegrid_ from './tilegrid.js';
-
-/**
- * @classdesc
- * An attribution for a layer source.
- *
- * Example:
- *
- *     source: new ol.source.OSM({
- *       attributions: [
- *         new ol.Attribution({
- *           html: 'All maps &copy; ' +
- *               '<a href="https://www.opencyclemap.org/">OpenCycleMap</a>'
- *         }),
- *         ol.source.OSM.ATTRIBUTION
- *       ],
- *     ..
- *
- * @constructor
- * @deprecated This class is deprecated and will removed in the next major release.
- * @param {olx.AttributionOptions} options Attribution options.
- * @struct
- * @api
- */
-var _ol_Attribution_ = function(options) {
-
-  /**
-   * @private
-   * @type {string}
-   */
-  this.html_ = options.html;
-
-  /**
-   * @private
-   * @type {Object.<string, Array.<ol.TileRange>>}
-   */
-  this.tileRanges_ = options.tileRanges ? options.tileRanges : null;
-
-};
-
-
-/**
- * Get the attribution markup.
- * @return {string} The attribution HTML.
- * @api
- */
-_ol_Attribution_.prototype.getHTML = function() {
-  return this.html_;
-};
-
-
-/**
- * @param {Object.<string, ol.TileRange>} tileRanges Tile ranges.
- * @param {!ol.tilegrid.TileGrid} tileGrid Tile grid.
- * @param {!ol.proj.Projection} projection Projection.
- * @return {boolean} Intersects any tile range.
- */
-_ol_Attribution_.prototype.intersectsAnyTileRange = function(tileRanges, tileGrid, projection) {
-  if (!this.tileRanges_) {
-    return true;
-  }
-  var i, ii, tileRange, zKey;
-  for (zKey in tileRanges) {
-    if (!(zKey in this.tileRanges_)) {
-      continue;
-    }
-    tileRange = tileRanges[zKey];
-    var testTileRange;
-    for (i = 0, ii = this.tileRanges_[zKey].length; i < ii; ++i) {
-      testTileRange = this.tileRanges_[zKey][i];
-      if (testTileRange.intersects(tileRange)) {
-        return true;
-      }
-      var extentTileRange = tileGrid.getTileRangeForExtentAndZ(
-          _ol_tilegrid_.extentFromProjection(projection), parseInt(zKey, 10));
-      var width = extentTileRange.getWidth();
-      if (tileRange.minX < extentTileRange.minX ||
-          tileRange.maxX > extentTileRange.maxX) {
-        if (testTileRange.intersects(new _ol_TileRange_(
-            _ol_math_.modulo(tileRange.minX, width),
-            _ol_math_.modulo(tileRange.maxX, width),
-            tileRange.minY, tileRange.maxY))) {
-          return true;
-        }
-        if (tileRange.getWidth() > width &&
-            testTileRange.intersects(extentTileRange)) {
-          return true;
-        }
-      }
-    }
-  }
-  return false;
-};
-export default _ol_Attribution_;
diff --git a/src/ol/control/Attribution.js b/src/ol/control/Attribution.js
index d18ba642a2..fbaacd36ed 100644
--- a/src/ol/control/Attribution.js
+++ b/src/ol/control/Attribution.js
@@ -174,7 +174,7 @@ _ol_control_Attribution_.prototype.getSourceAttributions_ = function(frameState)
       continue;
     }
 
-    var attributionGetter = source.getAttributions2();
+    var attributionGetter = source.getAttributions();
     if (!attributionGetter) {
       continue;
     }
diff --git a/src/ol/source/Source.js b/src/ol/source/Source.js
index 58c464c4fa..136339031d 100644
--- a/src/ol/source/Source.js
+++ b/src/ol/source/Source.js
@@ -2,7 +2,6 @@
  * @module ol/source/Source
  */
 import {inherits, nullFunction} from '../index.js';
-import _ol_Attribution_ from '../Attribution.js';
 import _ol_Object_ from '../Object.js';
 import _ol_proj_ from '../proj.js';
 import _ol_source_State_ from '../source/State.js';
@@ -33,15 +32,9 @@ var _ol_source_Source_ = function(options) {
 
   /**
    * @private
-   * @type {Array.<ol.Attribution>}
+   * @type {?ol.Attribution}
    */
-  this.attributions_ = null;
-
-  /**
-   * @private
-   * @type {?ol.Attribution2}
-   */
-  this.attributions2_ = this.adaptAttributions_(options.attributions);
+  this.attributions_ = this.adaptAttributions_(options.attributions);
 
   /**
    * @private
@@ -68,42 +61,14 @@ inherits(_ol_source_Source_, _ol_Object_);
 
 /**
  * Turns the attributions option into an attributions function.
- * @suppress {deprecated}
  * @param {ol.AttributionLike|undefined} attributionLike The attribution option.
- * @return {?ol.Attribution2} An attribution function (or null).
+ * @return {?ol.Attribution} An attribution function (or null).
  */
 _ol_source_Source_.prototype.adaptAttributions_ = function(attributionLike) {
   if (!attributionLike) {
     return null;
   }
-  if (attributionLike instanceof _ol_Attribution_) {
-
-    // TODO: remove attributions_ in next major release
-    this.attributions_ = [attributionLike];
-
-    return function(frameState) {
-      return [attributionLike.getHTML()];
-    };
-  }
   if (Array.isArray(attributionLike)) {
-    if (attributionLike[0] instanceof _ol_Attribution_) {
-
-      // TODO: remove attributions_ in next major release
-      this.attributions_ = attributionLike;
-
-      var attributions = attributionLike.map(function(attribution) {
-        return attribution.getHTML();
-      });
-      return function(frameState) {
-        return attributions;
-      };
-    }
-
-    // TODO: remove attributions_ in next major release
-    this.attributions_ = attributionLike.map(function(attribution) {
-      return new _ol_Attribution_({html: attribution});
-    });
-
     return function(frameState) {
       return attributionLike;
     };
@@ -113,11 +78,6 @@ _ol_source_Source_.prototype.adaptAttributions_ = function(attributionLike) {
     return attributionLike;
   }
 
-  // TODO: remove attributions_ in next major release
-  this.attributions_ = [
-    new _ol_Attribution_({html: attributionLike})
-  ];
-
   return function(frameState) {
     return [attributionLike];
   };
@@ -138,24 +98,14 @@ _ol_source_Source_.prototype.forEachFeatureAtCoordinate = nullFunction;
 
 
 /**
- * Get the attributions of the source.
- * @return {Array.<ol.Attribution>} Attributions.
- * @api
+ * Get the attribution function for the source.
+ * @return {?ol.Attribution} Attribution function.
  */
 _ol_source_Source_.prototype.getAttributions = function() {
   return this.attributions_;
 };
 
 
-/**
- * Get the attribution function for the source.
- * @return {?ol.Attribution2} Attribution function.
- */
-_ol_source_Source_.prototype.getAttributions2 = function() {
-  return this.attributions2_;
-};
-
-
 /**
  * Get the logo of the source.
  * @return {string|olx.LogoOptions|undefined} Logo.
@@ -213,12 +163,12 @@ _ol_source_Source_.prototype.refresh = function() {
 /**
  * Set the attributions of the source.
  * @param {ol.AttributionLike|undefined} attributions Attributions.
- *     Can be passed as `string`, `Array<string>`, `{@link ol.Attribution2}`,
+ *     Can be passed as `string`, `Array<string>`, `{@link ol.Attribution}`,
  *     or `undefined`.
  * @api
  */
 _ol_source_Source_.prototype.setAttributions = function(attributions) {
-  this.attributions2_ = this.adaptAttributions_(attributions);
+  this.attributions_ = this.adaptAttributions_(attributions);
   this.changed();
 };
 
diff --git a/src/ol/source/TileJSON.js b/src/ol/source/TileJSON.js
index c191736595..23728876ae 100644
--- a/src/ol/source/TileJSON.js
+++ b/src/ol/source/TileJSON.js
@@ -136,7 +136,7 @@ _ol_source_TileJSON_.prototype.handleTileJSONResponse = function(tileJSON) {
   this.tileUrlFunction =
       _ol_TileUrlFunction_.createFromTemplates(tileJSON.tiles, tileGrid);
 
-  if (tileJSON.attribution !== undefined && !this.getAttributions2()) {
+  if (tileJSON.attribution !== undefined && !this.getAttributions()) {
     var attributionExtent = extent !== undefined ?
       extent : epsg4326Projection.getExtent();
 
diff --git a/src/ol/typedefs.js b/src/ol/typedefs.js
index 7163d6b873..60c7569c04 100644
--- a/src/ol/typedefs.js
+++ b/src/ol/typedefs.js
@@ -75,10 +75,9 @@ ol.AtlasManagerInfo;
  * It represents either
  * * a simple string (e.g. `'© Acme Inc.'`)
  * * an array of simple strings (e.g. `['© Acme Inc.', '© Bacme Inc.']`)
- * * a function that returns a string or array of strings (`{@link ol.Attribution2}`)
+ * * a function that returns a string or array of strings (`{@link ol.Attribution}`)
  *
- * Note that the `{@link ol.Attribution}` constructor is deprecated.
- * @typedef {string|Array.<string>|ol.Attribution2|ol.Attribution|Array.<ol.Attribution>}
+ * @typedef {string|Array.<string>|ol.Attribution}
  */
 ol.AttributionLike;
 
@@ -89,7 +88,7 @@ ol.AttributionLike;
  *
  * @typedef {function(olx.FrameState): (string|Array.<string>)}
  */
-ol.Attribution2;
+ol.Attribution;
 
 
 /**
diff --git a/test/spec/ol/source/source.test.js b/test/spec/ol/source/source.test.js
index 21d2085607..e05604888d 100644
--- a/test/spec/ol/source/source.test.js
+++ b/test/spec/ol/source/source.test.js
@@ -1,4 +1,3 @@
-import _ol_Attribution_ from '../../../../src/ol/Attribution.js';
 import _ol_proj_ from '../../../../src/ol/proj.js';
 import _ol_source_Source_ from '../../../../src/ol/source/Source.js';
 
@@ -17,7 +16,7 @@ describe('ol.source.Source', function() {
   describe('config option `attributions`', function() {
     it('accepts undefined', function() {
       var source = new _ol_source_Source_({});
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.be(null);
     });
 
@@ -25,7 +24,7 @@ describe('ol.source.Source', function() {
       var source = new _ol_source_Source_({
         attributions: 'Humpty'
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty']);
@@ -35,7 +34,7 @@ describe('ol.source.Source', function() {
       var source = new _ol_source_Source_({
         attributions: ['Humpty', 'Dumpty']
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty', 'Dumpty']);
@@ -47,7 +46,7 @@ describe('ol.source.Source', function() {
           return 'Humpty';
         }
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.be('Humpty');
@@ -59,7 +58,7 @@ describe('ol.source.Source', function() {
           return ['Humpty', 'Dumpty'];
         }
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty', 'Dumpty']);
@@ -78,55 +77,6 @@ describe('ol.source.Source', function() {
     });
   });
 
-  describe('#getAttributions()', function() {
-    it('maintains backwards compatibility for string option', function() {
-      var source = new _ol_source_Source_({
-        attributions: 'foo'
-      });
-      var attributions = source.getAttributions();
-      expect(attributions.length).to.be(1);
-      expect(attributions[0]).to.be.an(_ol_Attribution_);
-      expect(attributions[0].getHTML()).to.be('foo');
-    });
-
-    it('maintains backwards compatibility for array of strings option', function() {
-      var source = new _ol_source_Source_({
-        attributions: ['foo', 'bar']
-      });
-      var attributions = source.getAttributions();
-      expect(attributions.length).to.be(2);
-      expect(attributions[0]).to.be.an(_ol_Attribution_);
-      expect(attributions[0].getHTML()).to.be('foo');
-      expect(attributions[1]).to.be.an(_ol_Attribution_);
-      expect(attributions[1].getHTML()).to.be('bar');
-    });
-
-    it('maintains backwards compatibility for ol.Attribution option', function() {
-      var source = new _ol_source_Source_({
-        attributions: new _ol_Attribution_({html: 'foo'})
-      });
-      var attributions = source.getAttributions();
-      expect(attributions.length).to.be(1);
-      expect(attributions[0]).to.be.an(_ol_Attribution_);
-      expect(attributions[0].getHTML()).to.be('foo');
-    });
-
-    it('maintains backwards compatibility for array of strings option', function() {
-      var source = new _ol_source_Source_({
-        attributions: [
-          new _ol_Attribution_({html: 'foo'}),
-          new _ol_Attribution_({html: 'bar'})
-        ]
-      });
-      var attributions = source.getAttributions();
-      expect(attributions.length).to.be(2);
-      expect(attributions[0]).to.be.an(_ol_Attribution_);
-      expect(attributions[0].getHTML()).to.be('foo');
-      expect(attributions[1]).to.be.an(_ol_Attribution_);
-      expect(attributions[1].getHTML()).to.be('bar');
-    });
-  });
-
   describe('#setAttributions()', function() {
     var source = null;
 
@@ -142,13 +92,13 @@ describe('ol.source.Source', function() {
 
     it('accepts undefined', function() {
       source.setAttributions();
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.be(null);
     });
 
     it('accepts a single string', function() {
       source.setAttributions('Humpty');
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty']);
@@ -156,7 +106,7 @@ describe('ol.source.Source', function() {
 
     it('accepts an array of strings', function() {
       source.setAttributions(['Humpty', 'Dumpty']);
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty', 'Dumpty']);
@@ -166,7 +116,7 @@ describe('ol.source.Source', function() {
       source.setAttributions(function() {
         return 'Humpty';
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql('Humpty');
@@ -176,7 +126,7 @@ describe('ol.source.Source', function() {
       source.setAttributions(function() {
         return ['Humpty', 'Dumpty'];
       });
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
       expect(attributions()).to.eql(['Humpty', 'Dumpty']);
diff --git a/test/spec/ol/source/tileutfgrid.test.js b/test/spec/ol/source/tileutfgrid.test.js
index d99ac409c9..479609bdc8 100644
--- a/test/spec/ol/source/tileutfgrid.test.js
+++ b/test/spec/ol/source/tileutfgrid.test.js
@@ -163,13 +163,13 @@ describe('ol.source.TileUTFGrid', function() {
 
     it('sets up correct attribution', function() {
       var source = getTileUTFGrid();
-      expect(source.getAttributions2()).to.be(null);
+      expect(source.getAttributions()).to.be(null);
 
       // call the handleTileJSONResponse method with our
       // locally available tileJson (from `before`)
       source.handleTileJSONResponse(tileJson);
 
-      var attributions = source.getAttributions2();
+      var attributions = source.getAttributions();
       expect(attributions).to.not.be(null);
       expect(typeof attributions).to.be('function');
     });