diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1749832..152d3fe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
+- Fixes [#1205](https://github.com/eamodio/vscode-gitlens/issues/1205) - Setting heatmap's `coldColor` and `hotColor` breaks file blame & related functionality
 - Fixes invalid branch status showing up for remote branches
 
 ## [11.0.5] - 2020-11-23
diff --git a/src/annotations/annotations.ts b/src/annotations/annotations.ts
index 3913a78..a067076 100644
--- a/src/annotations/annotations.ts
+++ b/src/annotations/annotations.ts
@@ -71,7 +71,7 @@ export async function getHeatmapColors() {
 		) {
 			colors = defaultHeatmapColors;
 		} else {
-			const chroma = await import(/* webpackChunkName: "heatmap-chroma" */ 'chroma-js');
+			const chroma = (await import(/* webpackChunkName: "heatmap-chroma" */ 'chroma-js')).default;
 			colors = chroma
 				.scale([Container.config.heatmap.hotColor, Container.config.heatmap.coldColor])
 				.mode('lrgb')
diff --git a/src/system/date.ts b/src/system/date.ts
index 5956b8a..2632948 100644
--- a/src/system/date.ts
+++ b/src/system/date.ts
@@ -4,9 +4,9 @@ import * as advancedFormat from 'dayjs/plugin/advancedFormat';
 import * as relativeTime from 'dayjs/plugin/relativeTime';
 import * as updateLocale from 'dayjs/plugin/updateLocale';
 
-dayjs.extend(advancedFormat);
-dayjs.extend(relativeTime);
-dayjs.extend(relativeTime, {
+dayjs.extend(advancedFormat.default);
+dayjs.extend(relativeTime.default);
+dayjs.extend(relativeTime.default, {
 	thresholds: [
 		{ l: 's', r: 44, d: 'second' },
 		{ l: 'm', r: 89 },
@@ -23,7 +23,7 @@ dayjs.extend(relativeTime, {
 		{ l: 'yy', d: 'year' },
 	],
 });
-dayjs.extend(updateLocale);
+dayjs.extend(updateLocale.default);
 
 dayjs.updateLocale('en', {
 	relativeTime: {
@@ -114,7 +114,7 @@ export interface DateFormatter {
 }
 
 export function getFormatter(date: Date): DateFormatter {
-	const formatter = dayjs(date);
+	const formatter = dayjs.default(date);
 	return {
 		fromNow: function (locale?: string) {
 			return (locale ? formatter.locale(locale) : formatter).fromNow();
diff --git a/src/webviews/apps/tsconfig.json b/src/webviews/apps/tsconfig.json
index 2588a73..3631893 100644
--- a/src/webviews/apps/tsconfig.json
+++ b/src/webviews/apps/tsconfig.json
@@ -2,7 +2,6 @@
 	"extends": "../../../tsconfig.json",
 	"compilerOptions": {
 		"allowSyntheticDefaultImports": true,
-		"esModuleInterop": true,
 		"lib": ["dom", "dom.iterable", "es2019"],
 		"outDir": "../../"
 	},
diff --git a/tsconfig.json b/tsconfig.json
index b0dcb5e..11f785a 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -1,5 +1,6 @@
 {
 	"compilerOptions": {
+		"esModuleInterop": true,
 		"experimentalDecorators": true,
 		"forceConsistentCasingInFileNames": true,
 		"incremental": true,