diff --git a/packages/kbn-optimizer/src/worker/webpack.config.ts b/packages/kbn-optimizer/src/worker/webpack.config.ts
index 876bc347a21c5..13e342356a2bc 100644
--- a/packages/kbn-optimizer/src/worker/webpack.config.ts
+++ b/packages/kbn-optimizer/src/worker/webpack.config.ts
@@ -166,8 +166,8 @@ export function getWebpackConfig(bundle: Bundle, bundleRefs: BundleRefs, worker:
                   loader: 'postcss-loader',
                   options: {
                     sourceMap: !worker.dist,
-                    config: {
-                      path: require.resolve('@kbn/optimizer/postcss.config.js'),
+                    postcssOptions: {
+                      config: require.resolve('@kbn/optimizer/postcss.config.js'),
                     },
                   },
                 },
diff --git a/packages/kbn-storybook/src/webpack.config.ts b/packages/kbn-storybook/src/webpack.config.ts
index 7f4821767cd9c..880afe83528a8 100644
--- a/packages/kbn-storybook/src/webpack.config.ts
+++ b/packages/kbn-storybook/src/webpack.config.ts
@@ -91,8 +91,8 @@ export default ({ config: storybookConfig }: { config: Configuration }) => {
             {
               loader: 'postcss-loader',
               options: {
-                config: {
-                  path: require.resolve('@kbn/optimizer/postcss.config.js'),
+                postcssOptions: {
+                  config: require.resolve('@kbn/optimizer/postcss.config.js'),
                 },
               },
             },
diff --git a/src/plugins/dashboard/public/application/embeddable/viewport/print_media/styling/_index.scss b/src/plugins/dashboard/public/application/embeddable/viewport/print_media/styling/_index.scss
index 16c4dd85ea45e..eec56a3ef2113 100644
--- a/src/plugins/dashboard/public/application/embeddable/viewport/print_media/styling/_index.scss
+++ b/src/plugins/dashboard/public/application/embeddable/viewport/print_media/styling/_index.scss
@@ -45,8 +45,9 @@ Observations:
   }
 
   * {
-    -webkit-print-color-adjust: exact !important;   /* Chrome, Safari, Edge */
-    color-adjust: exact !important;                 /*Firefox*/
+    // requires upgrade to stylint 14
+    // stylelint-disable-next-line property-no-unknown
+    print-color-adjust: exact !important;
   }
 
 }
diff --git a/x-pack/plugins/canvas/shareable_runtime/webpack.config.js b/x-pack/plugins/canvas/shareable_runtime/webpack.config.js
index 09a0999194490..8d679f53770f7 100644
--- a/x-pack/plugins/canvas/shareable_runtime/webpack.config.js
+++ b/x-pack/plugins/canvas/shareable_runtime/webpack.config.js
@@ -78,8 +78,8 @@ module.exports = {
           {
             loader: 'postcss-loader',
             options: {
-              config: {
-                path: require.resolve('./postcss.config.js'),
+              postcssOptions: {
+                config: require.resolve('./postcss.config.js'),
               },
             },
           },
@@ -111,8 +111,8 @@ module.exports = {
           {
             loader: 'postcss-loader',
             options: {
-              config: {
-                path: require.resolve('@kbn/optimizer/postcss.config.js'),
+              postcssOptions: {
+                config: require.resolve('@kbn/optimizer/postcss.config.js'),
               },
             },
           },
@@ -142,8 +142,8 @@ module.exports = {
             loader: 'postcss-loader',
             options: {
               sourceMap: !isProd,
-              config: {
-                path: require.resolve('./postcss.config'),
+              postcssOptions: {
+                config: require.resolve('./postcss.config'),
               },
             },
           },
diff --git a/x-pack/plugins/canvas/storybook/canvas_webpack.ts b/x-pack/plugins/canvas/storybook/canvas_webpack.ts
index e8ce5ff03b812..39a6eded270a7 100644
--- a/x-pack/plugins/canvas/storybook/canvas_webpack.ts
+++ b/x-pack/plugins/canvas/storybook/canvas_webpack.ts
@@ -30,7 +30,9 @@ export const canvasWebpack = {
           {
             loader: 'postcss-loader',
             options: {
-              path: resolve(KIBANA_ROOT, 'src/optimize/postcss.config.js'),
+              postcssOptions: {
+                config: resolve(KIBANA_ROOT, 'src/optimize/postcss.config.js'),
+              },
             },
           },
           {