diff --git a/package-lock.json b/package-lock.json
index 97b4a42..528bb70 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1164,9 +1164,9 @@
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+      "resolved": "https://registry.npmjs.org/d3-color/-/d3-color-3.1.0.tgz",
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     "d3-dispatch": {
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@@ -1183,38 +1183,48 @@
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     "d3-format": {
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-      "resolved": "https://registry.npmjs.org/d3-format/-/d3-format-2.0.0.tgz",
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/d3-format/-/d3-format-3.1.0.tgz",
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-      "resolved": "https://registry.npmjs.org/d3-interpolate/-/d3-interpolate-2.0.1.tgz",
-      "integrity": "sha512-c5UhwwTs/yybcmTpAVqwSFl6vrQ8JZJoT5F7xNFK9pymv5C0Ymcc9/LIJHtYIggg/yS9YHw8i8O8tgb9pupjeQ==",
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+      "resolved": "https://registry.npmjs.org/d3-interpolate/-/d3-interpolate-3.0.1.tgz",
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-        "d3-color": "1 - 2"
+        "d3-color": "1 - 3"
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-      "version": "3.2.3",
-      "resolved": "https://registry.npmjs.org/d3-scale/-/d3-scale-3.2.3.tgz",
-      "integrity": "sha512-8E37oWEmEzj57bHcnjPVOBS3n4jqakOeuv1EDdQSiSrYnMCBdMd3nc4HtKk7uia8DUHcY/CGuJ42xxgtEYrX0g==",
-      "requires": {
-        "d3-array": "^2.3.0",
-        "d3-format": "1 - 2",
-        "d3-interpolate": "1.2.0 - 2",
-        "d3-time": "1 - 2",
-        "d3-time-format": "2 - 3"
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/d3-scale/-/d3-scale-4.0.2.tgz",
+      "integrity": "sha512-GZW464g1SH7ag3Y7hXjf8RoUuAFIqklOAq3MRl4OaWabTFJY9PN/E1YklhXLh+OQ3fM9yS2nOkCoS+WLZ6kvxQ==",
+      "requires": {
+        "d3-array": "2.10.0 - 3",
+        "d3-format": "1 - 3",
+        "d3-interpolate": "1.2.0 - 3",
+        "d3-time": "2.1.1 - 3",
+        "d3-time-format": "2 - 4"
+      },
+      "dependencies": {
+        "d3-array": {
+          "version": "3.2.0",
+          "resolved": "https://registry.npmjs.org/d3-array/-/d3-array-3.2.0.tgz",
+          "integrity": "sha512-3yXFQo0oG3QCxbF06rMPFyGRMGJNS7NvsV1+2joOjbBE+9xvWQ8+GcMJAjRCzw06zQ3/arXeJgbPYcjUCuC+3g==",
+          "requires": {
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+          }
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     "d3-scale-chromatic": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-2.0.0.tgz",
-      "integrity": "sha512-LLqy7dJSL8yDy7NRmf6xSlsFZ6zYvJ4BcWFE4zBrOPnQERv9zj24ohnXKRbyi9YHnYV+HN1oEO3iFK971/gkzA==",
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-scale-chromatic/-/d3-scale-chromatic-3.0.0.tgz",
+      "integrity": "sha512-Lx9thtxAKrO2Pq6OO2Ua474opeziKr279P/TKZsMAhYyNDD3EnCffdbgeSYN5O7m2ByQsxtuP2CSDczNUIZ22g==",
       "dev": true,
       "requires": {
-        "d3-color": "1 - 2",
-        "d3-interpolate": "1 - 2"
+        "d3-color": "1 - 3",
+        "d3-interpolate": "1 - 3"
       }
     },
     "d3-selection": {
@@ -1223,16 +1233,19 @@
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     "d3-time": {
-      "version": "2.0.0",
-      "resolved": "https://registry.npmjs.org/d3-time/-/d3-time-2.0.0.tgz",
-      "integrity": "sha512-2mvhstTFcMvwStWd9Tj3e6CEqtOivtD8AUiHT8ido/xmzrI9ijrUUihZ6nHuf/vsScRBonagOdj0Vv+SEL5G3Q=="
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/d3-time/-/d3-time-3.0.0.tgz",
+      "integrity": "sha512-zmV3lRnlaLI08y9IMRXSDshQb5Nj77smnfpnd2LrBa/2K281Jijactokeak14QacHs/kKq0AQ121nidNYlarbQ==",
+      "requires": {
+        "d3-array": "2 - 3"
+      }
     },
     "d3-time-format": {
-      "version": "3.0.0",
-      "resolved": "https://registry.npmjs.org/d3-time-format/-/d3-time-format-3.0.0.tgz",
-      "integrity": "sha512-UXJh6EKsHBTjopVqZBhFysQcoXSv/5yLONZvkQ5Kk3qbwiUYkdX17Xa1PT6U1ZWXGGfB1ey5L8dKMlFq2DO0Ag==",
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/d3-time-format/-/d3-time-format-4.1.0.tgz",
+      "integrity": "sha512-dJxPBlzC7NugB2PDLwo9Q8JiTR3M3e4/XANkreKSUxF8vvXKqm1Yfq4Q5dl8budlunRVlUUaDUgFt7eA8D6NLg==",
       "requires": {
-        "d3-time": "1 - 2"
+        "d3-time": "1 - 3"
       }
     },
     "dashdash": {
@@ -2076,6 +2089,11 @@
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+    "internmap": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/internmap/-/internmap-2.0.3.tgz",
+      "integrity": "sha512-5Hh7Y1wQbvY5ooGgPbDaL5iYLAPzMTUrjMulskHLH6wnv/A+1q5rgEaiuqEjB+oxGXIVZs1FF+R/KPN3ZSQYYg=="
+    },
     "ip-regex": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/ip-regex/-/ip-regex-2.1.0.tgz",
diff --git a/package.json b/package.json
index 17fe575..98403a3 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
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     "@types/jsdom": "^16.2.5",
     "@types/mocha": "^8.2.0",
-    "d3-scale-chromatic": "^2.0.0",
+    "d3-scale-chromatic": "^3.0.0",
     "expect.js": "^0.3.1",
     "jsdom": "^16.4.0",
     "karma": "^5.2.3",
@@ -56,7 +56,7 @@
     "d3-array": "^2.0.3",
     "d3-axis": "^2.0.0",
     "d3-drag": "^1.2.3",
-    "d3-scale": "^3.1.0",
+    "d3-scale": "^4.0.2",
     "d3-selection": "^1.4.0"
   }
 }