diff --git a/README.md b/README.md
index 7c04ee92..7224a104 100644
--- a/README.md
+++ b/README.md
@@ -181,56 +181,56 @@ const config = await loadConfig(configFile, cwd);
 
 | Plugin                                                                                                              | Description                                                                                                                                              | Default    |
 | ------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------- |
-| [cleanupAttrs](https://github.com/svg/svgo/blob/master/plugins/cleanupAttrs.js)                                     | cleanup attributes from newlines, trailing, and repeating spaces                                                                                         | `enabled`  |
-| [mergeStyles](https://github.com/svg/svgo/blob/master/plugins/mergeStyles.js)                                       | merge multiple style elements into one                                                                                                                   | `enabled`  |
-| [inlineStyles](https://github.com/svg/svgo/blob/master/plugins/inlineStyles.js)                                     | move and merge styles from `<style>` elements to element `style` attributes                                                                              | `enabled`  |
-| [removeDoctype](https://github.com/svg/svgo/blob/master/plugins/removeDoctype.js)                                   | remove `doctype` declaration                                                                                                                             | `enabled`  |
-| [removeXMLProcInst](https://github.com/svg/svgo/blob/master/plugins/removeXMLProcInst.js)                           | remove XML processing instructions                                                                                                                       | `enabled`  |
-| [removeComments](https://github.com/svg/svgo/blob/master/plugins/removeComments.js)                                 | remove comments                                                                                                                                          | `enabled`  |
-| [removeMetadata](https://github.com/svg/svgo/blob/master/plugins/removeMetadata.js)                                 | remove `<metadata>`                                                                                                                                      | `enabled`  |
-| [removeTitle](https://github.com/svg/svgo/blob/master/plugins/removeTitle.js)                                       | remove `<title>`                                                                                                                                         | `enabled`  |
-| [removeDesc](https://github.com/svg/svgo/blob/master/plugins/removeDesc.js)                                         | remove `<desc>`                                                                                                                                          | `enabled`  |
-| [removeUselessDefs](https://github.com/svg/svgo/blob/master/plugins/removeUselessDefs.js)                           | remove elements of `<defs>` without `id`                                                                                                                 | `enabled`  |
-| [removeXMLNS](https://github.com/svg/svgo/blob/master/plugins/removeXMLNS.js)                                       | removes the `xmlns` attribute (for inline SVG)                                                                                                           | `disabled` |
-| [removeEditorsNSData](https://github.com/svg/svgo/blob/master/plugins/removeEditorsNSData.js)                       | remove editors namespaces, elements, and attributes                                                                                                      | `enabled`  |
-| [removeEmptyAttrs](https://github.com/svg/svgo/blob/master/plugins/removeEmptyAttrs.js)                             | remove empty attributes                                                                                                                                  | `enabled`  |
-| [removeHiddenElems](https://github.com/svg/svgo/blob/master/plugins/removeHiddenElems.js)                           | remove hidden elements                                                                                                                                   | `enabled`  |
-| [removeEmptyText](https://github.com/svg/svgo/blob/master/plugins/removeEmptyText.js)                               | remove empty Text elements                                                                                                                               | `enabled`  |
-| [removeEmptyContainers](https://github.com/svg/svgo/blob/master/plugins/removeEmptyContainers.js)                   | remove empty Container elements                                                                                                                          | `enabled`  |
-| [removeViewBox](https://github.com/svg/svgo/blob/master/plugins/removeViewBox.js)                                   | remove `viewBox` attribute when possible                                                                                                                 | `enabled`  |
-| [cleanupEnableBackground](https://github.com/svg/svgo/blob/master/plugins/cleanupEnableBackground.js)               | remove or cleanup `enable-background` attribute when possible                                                                                            | `enabled`  |
-| [minifyStyles](https://github.com/svg/svgo/blob/master/plugins/minifyStyles.js)                                     | minify `<style>` elements content with [CSSO](https://github.com/css/csso)                                                                               | `enabled`  |
-| [convertStyleToAttrs](https://github.com/svg/svgo/blob/master/plugins/convertStyleToAttrs.js)                       | convert styles into attributes                                                                                                                           | `disabled` |
-| [convertColors](https://github.com/svg/svgo/blob/master/plugins/convertColors.js)                                   | convert colors (from `rgb()` to `#rrggbb`, from `#rrggbb` to `#rgb`)                                                                                     | `enabled`  |
-| [convertPathData](https://github.com/svg/svgo/blob/master/plugins/convertPathData.js)                               | convert Path data to relative or absolute (whichever is shorter), convert one segment to another, trim useless delimiters, smart rounding, and much more | `enabled`  |
-| [convertTransform](https://github.com/svg/svgo/blob/master/plugins/convertTransform.js)                             | collapse multiple transforms into one, convert matrices to the short aliases, and much more                                                              | `enabled`  |
-| [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/master/plugins/removeUnknownsAndDefaults.js)           | remove unknown elements content and attributes, remove attributes with default values                                                                    | `enabled`  |
-| [removeNonInheritableGroupAttrs](https://github.com/svg/svgo/blob/master/plugins/removeNonInheritableGroupAttrs.js) | remove non-inheritable group's "presentation" attributes                                                                                                 | `enabled`  |
-| [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/master/plugins/removeUselessStrokeAndFill.js)         | remove useless `stroke` and `fill` attributes                                                                                                            | `enabled`  |
-| [removeUnusedNS](https://github.com/svg/svgo/blob/master/plugins/removeUnusedNS.js)                                 | remove unused namespaces declaration                                                                                                                     | `enabled`  |
-| [prefixIds](https://github.com/svg/svgo/blob/master/plugins/prefixIds.js)                                           | prefix IDs and classes with the SVG filename or an arbitrary string                                                                                      | `disabled` |
-| [cleanupIDs](https://github.com/svg/svgo/blob/master/plugins/cleanupIDs.js)                                         | remove unused and minify used IDs                                                                                                                        | `enabled`  |
-| [cleanupNumericValues](https://github.com/svg/svgo/blob/master/plugins/cleanupNumericValues.js)                     | round numeric values to the fixed precision, remove default `px` units                                                                                   | `enabled`  |
-| [cleanupListOfValues](https://github.com/svg/svgo/blob/master/plugins/cleanupListOfValues.js)                       | round numeric values in attributes that take a list of numbers (like `viewBox` or `enable-background`)                                                   | `disabled` |
-| [moveElemsAttrsToGroup](https://github.com/svg/svgo/blob/master/plugins/moveElemsAttrsToGroup.js)                   | move elements' attributes to their enclosing group                                                                                                       | `enabled`  |
-| [moveGroupAttrsToElems](https://github.com/svg/svgo/blob/master/plugins/moveGroupAttrsToElems.js)                   | move some group attributes to the contained elements                                                                                                     | `enabled`  |
-| [collapseGroups](https://github.com/svg/svgo/blob/master/plugins/collapseGroups.js)                                 | collapse useless groups                                                                                                                                  | `enabled`  |
-| [removeRasterImages](https://github.com/svg/svgo/blob/master/plugins/removeRasterImages.js)                         | remove raster images                                                                                                                                     | `disabled` |
-| [mergePaths](https://github.com/svg/svgo/blob/master/plugins/mergePaths.js)                                         | merge multiple Paths into one                                                                                                                            | `enabled`  |
-| [convertShapeToPath](https://github.com/svg/svgo/blob/master/plugins/convertShapeToPath.js)                         | convert some basic shapes to `<path>`                                                                                                                    | `enabled`  |
-| [convertEllipseToCircle](https://github.com/svg/svgo/blob/master/plugins/convertEllipseToCircle.js)                 | convert non-eccentric `<ellipse>` to `<circle>`                                                                                                          | `enabled`  |
-| [sortAttrs](https://github.com/svg/svgo/blob/master/plugins/sortAttrs.js)                                           | sort element attributes for epic readability                                                                                                             | `disabled` |
-| [sortDefsChildren](https://github.com/svg/svgo/blob/master/plugins/sortDefsChildren.js)                             | sort children of `<defs>` in order to improve compression                                                                                                | `enabled`  |
-| [removeDimensions](https://github.com/svg/svgo/blob/master/plugins/removeDimensions.js)                             | remove `width`/`height` and add `viewBox` if it's missing (opposite to removeViewBox, disable it first)                                                  | `disabled` |
-| [removeAttrs](https://github.com/svg/svgo/blob/master/plugins/removeAttrs.js)                                       | remove attributes by pattern                                                                                                                             | `disabled` |
-| [removeAttributesBySelector](https://github.com/svg/svgo/blob/master/plugins/removeAttributesBySelector.js)         | removes attributes of elements that match a CSS selector                                                                                                 | `disabled` |
-| [removeElementsByAttr](https://github.com/svg/svgo/blob/master/plugins/removeElementsByAttr.js)                     | remove arbitrary elements by `ID` or `className`                                                                                                         | `disabled` |
-| [addClassesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addClassesToSVGElement.js)                 | add classnames to an outer `<svg>` element                                                                                                               | `disabled` |
-| [addAttributesToSVGElement](https://github.com/svg/svgo/blob/master/plugins/addAttributesToSVGElement.js)           | adds attributes to an outer `<svg>` element                                                                                                              | `disabled` |
-| [removeOffCanvasPaths](https://github.com/svg/svgo/blob/master/plugins/removeOffCanvasPaths.js)                     | removes elements that are drawn outside of the viewbox                                                                                                   | `disabled` |
-| [removeStyleElement](https://github.com/svg/svgo/blob/master/plugins/removeStyleElement.js)                         | remove `<style>` elements                                                                                                                                | `disabled` |
-| [removeScriptElement](https://github.com/svg/svgo/blob/master/plugins/removeScriptElement.js)                       | remove `<script>` elements                                                                                                                               | `disabled` |
-| [reusePaths](https://github.com/svg/svgo/blob/master/plugins/reusePaths.js)                                         | Find duplicated <path> elements and replace them with <use> links                                                                                        | `disabled` |
+| [cleanupAttrs](https://github.com/svg/svgo/blob/main/plugins/cleanupAttrs.js)                                     | cleanup attributes from newlines, trailing, and repeating spaces                                                                                         | `enabled`  |
+| [mergeStyles](https://github.com/svg/svgo/blob/main/plugins/mergeStyles.js)                                       | merge multiple style elements into one                                                                                                                   | `enabled`  |
+| [inlineStyles](https://github.com/svg/svgo/blob/main/plugins/inlineStyles.js)                                     | move and merge styles from `<style>` elements to element `style` attributes                                                                              | `enabled`  |
+| [removeDoctype](https://github.com/svg/svgo/blob/main/plugins/removeDoctype.js)                                   | remove `doctype` declaration                                                                                                                             | `enabled`  |
+| [removeXMLProcInst](https://github.com/svg/svgo/blob/main/plugins/removeXMLProcInst.js)                           | remove XML processing instructions                                                                                                                       | `enabled`  |
+| [removeComments](https://github.com/svg/svgo/blob/main/plugins/removeComments.js)                                 | remove comments                                                                                                                                          | `enabled`  |
+| [removeMetadata](https://github.com/svg/svgo/blob/main/plugins/removeMetadata.js)                                 | remove `<metadata>`                                                                                                                                      | `enabled`  |
+| [removeTitle](https://github.com/svg/svgo/blob/main/plugins/removeTitle.js)                                       | remove `<title>`                                                                                                                                         | `enabled`  |
+| [removeDesc](https://github.com/svg/svgo/blob/main/plugins/removeDesc.js)                                         | remove `<desc>`                                                                                                                                          | `enabled`  |
+| [removeUselessDefs](https://github.com/svg/svgo/blob/main/plugins/removeUselessDefs.js)                           | remove elements of `<defs>` without `id`                                                                                                                 | `enabled`  |
+| [removeXMLNS](https://github.com/svg/svgo/blob/main/plugins/removeXMLNS.js)                                       | removes the `xmlns` attribute (for inline SVG)                                                                                                           | `disabled` |
+| [removeEditorsNSData](https://github.com/svg/svgo/blob/main/plugins/removeEditorsNSData.js)                       | remove editors namespaces, elements, and attributes                                                                                                      | `enabled`  |
+| [removeEmptyAttrs](https://github.com/svg/svgo/blob/main/plugins/removeEmptyAttrs.js)                             | remove empty attributes                                                                                                                                  | `enabled`  |
+| [removeHiddenElems](https://github.com/svg/svgo/blob/main/plugins/removeHiddenElems.js)                           | remove hidden elements                                                                                                                                   | `enabled`  |
+| [removeEmptyText](https://github.com/svg/svgo/blob/main/plugins/removeEmptyText.js)                               | remove empty Text elements                                                                                                                               | `enabled`  |
+| [removeEmptyContainers](https://github.com/svg/svgo/blob/main/plugins/removeEmptyContainers.js)                   | remove empty Container elements                                                                                                                          | `enabled`  |
+| [removeViewBox](https://github.com/svg/svgo/blob/main/plugins/removeViewBox.js)                                   | remove `viewBox` attribute when possible                                                                                                                 | `enabled`  |
+| [cleanupEnableBackground](https://github.com/svg/svgo/blob/main/plugins/cleanupEnableBackground.js)               | remove or cleanup `enable-background` attribute when possible                                                                                            | `enabled`  |
+| [minifyStyles](https://github.com/svg/svgo/blob/main/plugins/minifyStyles.js)                                     | minify `<style>` elements content with [CSSO](https://github.com/css/csso)                                                                               | `enabled`  |
+| [convertStyleToAttrs](https://github.com/svg/svgo/blob/main/plugins/convertStyleToAttrs.js)                       | convert styles into attributes                                                                                                                           | `disabled` |
+| [convertColors](https://github.com/svg/svgo/blob/main/plugins/convertColors.js)                                   | convert colors (from `rgb()` to `#rrggbb`, from `#rrggbb` to `#rgb`)                                                                                     | `enabled`  |
+| [convertPathData](https://github.com/svg/svgo/blob/main/plugins/convertPathData.js)                               | convert Path data to relative or absolute (whichever is shorter), convert one segment to another, trim useless delimiters, smart rounding, and much more | `enabled`  |
+| [convertTransform](https://github.com/svg/svgo/blob/main/plugins/convertTransform.js)                             | collapse multiple transforms into one, convert matrices to the short aliases, and much more                                                              | `enabled`  |
+| [removeUnknownsAndDefaults](https://github.com/svg/svgo/blob/main/plugins/removeUnknownsAndDefaults.js)           | remove unknown elements content and attributes, remove attributes with default values                                                                    | `enabled`  |
+| [removeNonInheritableGroupAttrs](https://github.com/svg/svgo/blob/main/plugins/removeNonInheritableGroupAttrs.js) | remove non-inheritable group's "presentation" attributes                                                                                                 | `enabled`  |
+| [removeUselessStrokeAndFill](https://github.com/svg/svgo/blob/main/plugins/removeUselessStrokeAndFill.js)         | remove useless `stroke` and `fill` attributes                                                                                                            | `enabled`  |
+| [removeUnusedNS](https://github.com/svg/svgo/blob/main/plugins/removeUnusedNS.js)                                 | remove unused namespaces declaration                                                                                                                     | `enabled`  |
+| [prefixIds](https://github.com/svg/svgo/blob/main/plugins/prefixIds.js)                                           | prefix IDs and classes with the SVG filename or an arbitrary string                                                                                      | `disabled` |
+| [cleanupIDs](https://github.com/svg/svgo/blob/main/plugins/cleanupIDs.js)                                         | remove unused and minify used IDs                                                                                                                        | `enabled`  |
+| [cleanupNumericValues](https://github.com/svg/svgo/blob/main/plugins/cleanupNumericValues.js)                     | round numeric values to the fixed precision, remove default `px` units                                                                                   | `enabled`  |
+| [cleanupListOfValues](https://github.com/svg/svgo/blob/main/plugins/cleanupListOfValues.js)                       | round numeric values in attributes that take a list of numbers (like `viewBox` or `enable-background`)                                                   | `disabled` |
+| [moveElemsAttrsToGroup](https://github.com/svg/svgo/blob/main/plugins/moveElemsAttrsToGroup.js)                   | move elements' attributes to their enclosing group                                                                                                       | `enabled`  |
+| [moveGroupAttrsToElems](https://github.com/svg/svgo/blob/main/plugins/moveGroupAttrsToElems.js)                   | move some group attributes to the contained elements                                                                                                     | `enabled`  |
+| [collapseGroups](https://github.com/svg/svgo/blob/main/plugins/collapseGroups.js)                                 | collapse useless groups                                                                                                                                  | `enabled`  |
+| [removeRasterImages](https://github.com/svg/svgo/blob/main/plugins/removeRasterImages.js)                         | remove raster images                                                                                                                                     | `disabled` |
+| [mergePaths](https://github.com/svg/svgo/blob/main/plugins/mergePaths.js)                                         | merge multiple Paths into one                                                                                                                            | `enabled`  |
+| [convertShapeToPath](https://github.com/svg/svgo/blob/main/plugins/convertShapeToPath.js)                         | convert some basic shapes to `<path>`                                                                                                                    | `enabled`  |
+| [convertEllipseToCircle](https://github.com/svg/svgo/blob/main/plugins/convertEllipseToCircle.js)                 | convert non-eccentric `<ellipse>` to `<circle>`                                                                                                          | `enabled`  |
+| [sortAttrs](https://github.com/svg/svgo/blob/main/plugins/sortAttrs.js)                                           | sort element attributes for epic readability                                                                                                             | `disabled` |
+| [sortDefsChildren](https://github.com/svg/svgo/blob/main/plugins/sortDefsChildren.js)                             | sort children of `<defs>` in order to improve compression                                                                                                | `enabled`  |
+| [removeDimensions](https://github.com/svg/svgo/blob/main/plugins/removeDimensions.js)                             | remove `width`/`height` and add `viewBox` if it's missing (opposite to removeViewBox, disable it first)                                                  | `disabled` |
+| [removeAttrs](https://github.com/svg/svgo/blob/main/plugins/removeAttrs.js)                                       | remove attributes by pattern                                                                                                                             | `disabled` |
+| [removeAttributesBySelector](https://github.com/svg/svgo/blob/main/plugins/removeAttributesBySelector.js)         | removes attributes of elements that match a CSS selector                                                                                                 | `disabled` |
+| [removeElementsByAttr](https://github.com/svg/svgo/blob/main/plugins/removeElementsByAttr.js)                     | remove arbitrary elements by `ID` or `className`                                                                                                         | `disabled` |
+| [addClassesToSVGElement](https://github.com/svg/svgo/blob/main/plugins/addClassesToSVGElement.js)                 | add classnames to an outer `<svg>` element                                                                                                               | `disabled` |
+| [addAttributesToSVGElement](https://github.com/svg/svgo/blob/main/plugins/addAttributesToSVGElement.js)           | adds attributes to an outer `<svg>` element                                                                                                              | `disabled` |
+| [removeOffCanvasPaths](https://github.com/svg/svgo/blob/main/plugins/removeOffCanvasPaths.js)                     | removes elements that are drawn outside of the viewbox                                                                                                   | `disabled` |
+| [removeStyleElement](https://github.com/svg/svgo/blob/main/plugins/removeStyleElement.js)                         | remove `<style>` elements                                                                                                                                | `disabled` |
+| [removeScriptElement](https://github.com/svg/svgo/blob/main/plugins/removeScriptElement.js)                       | remove `<script>` elements                                                                                                                               | `disabled` |
+| [reusePaths](https://github.com/svg/svgo/blob/main/plugins/reusePaths.js)                                         | Find duplicated <path> elements and replace them with <use> links                                                                                        | `disabled` |
 
 ## Other Ways to Use SVGO
 
@@ -257,12 +257,12 @@ const config = await loadConfig(configFile, cwd);
 
 ## Donators
 
-| [<img src="https://sheetjs.com/sketch128.png" width="80">](https://sheetjs.com/) | [<img src="https://raw.githubusercontent.com/fontello/fontello/master/fontello-image.svg" width="80">](https://fontello.com/) |
+| [<img src="https://sheetjs.com/sketch128.png" width="80">](https://sheetjs.com/) | [<img src="https://raw.githubusercontent.com/fontello/fontello/main/fontello-image.svg" width="80">](https://fontello.com/) |
 | :------------------------------------------------------------------------------: | :---------------------------------------------------------------------------------------------------------------------------: |
 |                       [SheetJS LLC](https://sheetjs.com/)                        |                                               [Fontello](https://fontello.com/)                                               |
 
 ## License and Copyright
 
-This software is released under the terms of the [MIT license](https://github.com/svg/svgo/blob/master/LICENSE).
+This software is released under the terms of the [MIT license](https://github.com/svg/svgo/blob/main/LICENSE).
 
 Logo by [André Castillo](https://github.com/DerianAndre).
diff --git a/lib/css-tools.js b/lib/css-tools.js
index a59aae6e..bc4a6895 100644
--- a/lib/css-tools.js
+++ b/lib/css-tools.js
@@ -120,7 +120,7 @@ function cleanPseudos(selectors) {
 
 /**
  * Compares two selector specificities.
- * extracted from https://github.com/keeganstreet/specificity/blob/master/specificity.js#L211
+ * extracted from https://github.com/keeganstreet/specificity/blob/main/specificity.js#L211
  *
  * @param {Array} aSpecificity Specificity of selector A
  * @param {Array} bSpecificity Specificity of selector B
diff --git a/lib/style.js b/lib/style.js
index 1873e7bd..029da4c1 100644
--- a/lib/style.js
+++ b/lib/style.js
@@ -195,7 +195,7 @@ const computeOwnStyle = (stylesheet, node) => {
 
 /**
  * Compares two selector specificities.
- * extracted from https://github.com/keeganstreet/specificity/blob/master/specificity.js#L211
+ * extracted from https://github.com/keeganstreet/specificity/blob/main/specificity.js#L211
  *
  * @type {(a: Specificity, b: Specificity) => number}
  */
diff --git a/plugins/inlineStyles.js b/plugins/inlineStyles.js
index a19f3fbd..67f67c6d 100644
--- a/plugins/inlineStyles.js
+++ b/plugins/inlineStyles.js
@@ -23,7 +23,7 @@ exports.description = 'inline styles (additional options)';
 
 /**
  * Compares two selector specificities.
- * extracted from https://github.com/keeganstreet/specificity/blob/master/specificity.js#L211
+ * extracted from https://github.com/keeganstreet/specificity/blob/main/specificity.js#L211
  *
  * @type {(a: Specificity, b: Specificity) => number}
  */