diff --git a/package.json b/package.json
index 3793eb7..e7bcc71 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,7 @@
   "devDependencies": {
     "@types/d3-dsv": "^1.0.33",
     "@types/geojson": "^7946.0.4",
-    "@types/jest": "^25.1.1",
+    "@types/jest": "^26.0.15",
     "@types/node": "^6.0.83",
     "cli-table3": "^0.5.1",
     "d3-dsv": "^2.0.0",
diff --git a/yarn.lock b/yarn.lock
index 0aa9c8f..90a8e2e 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -292,15 +292,16 @@
     "@types/istanbul-reports" "^1.1.1"
     "@types/yargs" "^13.0.0"
 
-"@jest/types@^25.1.0":
-  version "25.1.0"
-  resolved "https://registry.yarnpkg.com/@jest/types/-/types-25.1.0.tgz#b26831916f0d7c381e11dbb5e103a72aed1b4395"
-  integrity sha512-VpOtt7tCrgvamWZh1reVsGADujKigBUFTi19mlRjqEGsE8qH4r3s+skY33dNdXOwyZIvuftZ5tqdF1IgsMejMA==
+"@jest/types@^26.6.1":
+  version "26.6.1"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.6.1.tgz#2638890e8031c0bc8b4681e0357ed986e2f866c5"
+  integrity sha512-ywHavIKNpAVrStiRY5wiyehvcktpijpItvGiK72RAn5ctqmzvPk8OvKnvHeBqa1XdQr959CTWAJMqxI8BTibyg==
   dependencies:
     "@types/istanbul-lib-coverage" "^2.0.0"
-    "@types/istanbul-reports" "^1.1.1"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
     "@types/yargs" "^15.0.0"
-    chalk "^3.0.0"
+    chalk "^4.0.0"
 
 "@turf/bbox@6.x", "@turf/bbox@^6.0.1":
   version "6.0.1"
@@ -484,13 +485,20 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@^25.1.1":
-  version "25.1.1"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-25.1.1.tgz#dcf65a8ee315b91ad39c0d358ae0ddc5602ab0e9"
-  integrity sha512-bKSZJYZJLzwaoVYNN4W3A0RvKNYsrLm5tsuXaMlfYDxKf4gY2sFrMYneCugNQWGg1gjPW+FHBwNrwPzEi4sIsw==
+"@types/istanbul-reports@^3.0.0":
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/@types/istanbul-reports/-/istanbul-reports-3.0.0.tgz#508b13aa344fa4976234e75dddcc34925737d821"
+  integrity sha512-nwKNbvnwJ2/mndE9ItP/zc2TCzw6uuodnF4EHYWD+gCQDVBuRQL5UzbZD0/ezy1iKsFU2ZQiDqg4M9dN4+wZgA==
+  dependencies:
+    "@types/istanbul-lib-report" "*"
+
+"@types/jest@^26.0.15":
+  version "26.0.15"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.15.tgz#12e02c0372ad0548e07b9f4e19132b834cb1effe"
+  integrity sha512-s2VMReFXRg9XXxV+CW9e5Nz8fH2K1aEhwgjUqPPbQd7g95T0laAcvLv032EhFHIa5GHsZ8W7iJEQVaJq6k3Gog==
   dependencies:
-    jest-diff "^25.1.0"
-    pretty-format "^25.1.0"
+    jest-diff "^26.0.0"
+    pretty-format "^26.0.0"
 
 "@types/node@*":
   version "12.6.8"
@@ -903,10 +911,10 @@ chalk@^2.0.0, chalk@^2.0.1, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chalk@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-3.0.0.tgz#3f73c2bf526591f574cc492c51e2456349f844e4"
-  integrity sha512-4D3B6Wf41KOYRFdszmDqMCGq5VV/uMAB273JILmO+3jAlh8X4qDtdtgCR3fxtbLEMzSx22QdhnDcJvu2u1fVwg==
+chalk@^4.0.0:
+  version "4.1.0"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.0.tgz#4e14870a618d9e2edd97dd8345fd9d9dc315646a"
+  integrity sha512-qwx12AxXe2Q5xQ43Ac//I6v5aXTipYrSESdOgzrN+9XjgEpyjpKuvSGaN4qE93f7TQTlerQQ8S+EQ0EyDoVL1A==
   dependencies:
     ansi-styles "^4.1.0"
     supports-color "^7.1.0"
@@ -1231,10 +1239,10 @@ diff-sequences@^24.9.0:
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-24.9.0.tgz#5715d6244e2aa65f48bba0bc972db0b0b11e95b5"
   integrity sha512-Dj6Wk3tWyTE+Fo1rW8v0Xhwk80um6yFYKbuAxc9c3EZxIHFDYwbi34Uk42u1CdnIiVorvt4RmlSDjIPyzGC2ew==
 
-diff-sequences@^25.1.0:
-  version "25.1.0"
-  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-25.1.0.tgz#fd29a46f1c913fd66c22645dc75bffbe43051f32"
-  integrity sha512-nFIfVk5B/NStCsJ+zaPO4vYuLjlzQ6uFvPxzYyHlejNZ/UGa7G/n7peOXVrVNvRuyfstt+mZQYGpjxg9Z6N8Kw==
+diff-sequences@^26.5.0:
+  version "26.5.0"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.5.0.tgz#ef766cf09d43ed40406611f11c6d8d9dd8b2fefd"
+  integrity sha512-ZXx86srb/iYy6jG71k++wBN9P9J05UNQ5hQHQd9MtMPvcqXPx/vKU69jfHV637D00Q2gSgPk2D+jSx3l1lDW/Q==
 
 diff@^4.0.1:
   version "4.0.1"
@@ -2138,15 +2146,15 @@ jest-diff@^24.9.0:
     jest-get-type "^24.9.0"
     pretty-format "^24.9.0"
 
-jest-diff@^25.1.0:
-  version "25.1.0"
-  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.1.0.tgz#58b827e63edea1bc80c1de952b80cec9ac50e1ad"
-  integrity sha512-nepXgajT+h017APJTreSieh4zCqnSHEJ1iT8HDlewu630lSJ4Kjjr9KNzm+kzGwwcpsDE6Snx1GJGzzsefaEHw==
+jest-diff@^26.0.0:
+  version "26.6.1"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.6.1.tgz#38aa194979f454619bb39bdee299fb64ede5300c"
+  integrity sha512-BBNy/zin2m4kG5In126O8chOBxLLS/XMTuuM2+YhgyHk87ewPzKTuTJcqj3lOWOi03NNgrl+DkMeV/exdvG9gg==
   dependencies:
-    chalk "^3.0.0"
-    diff-sequences "^25.1.0"
-    jest-get-type "^25.1.0"
-    pretty-format "^25.1.0"
+    chalk "^4.0.0"
+    diff-sequences "^26.5.0"
+    jest-get-type "^26.3.0"
+    pretty-format "^26.6.1"
 
 jest-docblock@^24.3.0:
   version "24.3.0"
@@ -2193,10 +2201,10 @@ jest-get-type@^24.9.0:
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-24.9.0.tgz#1684a0c8a50f2e4901b6644ae861f579eed2ef0e"
   integrity sha512-lUseMzAley4LhIcpSP9Jf+fTrQ4a1yHQwLNeeVa2cEmbCGeoZAtYPOIv8JaxLD/sUpKxetKGP+gsHl8f8TSj8Q==
 
-jest-get-type@^25.1.0:
-  version "25.1.0"
-  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-25.1.0.tgz#1cfe5fc34f148dc3a8a3b7275f6b9ce9e2e8a876"
-  integrity sha512-yWkBnT+5tMr8ANB6V+OjmrIJufHtCAqI5ic2H40v+tRqxDmE0PGnIiTyvRWFOMtmVHYpwRqyazDbTnhpjsGvLw==
+jest-get-type@^26.3.0:
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-26.3.0.tgz#e97dc3c3f53c2b406ca7afaed4493b1d099199e0"
+  integrity sha512-TpfaviN1R2pQWkIihlfEanwOXK0zcxrKEE4MlU6Tn7keoXdN6/3gK/xl0yEh8DOunn5pOVGKf8hB4R9gVh04ig==
 
 jest-haste-map@^24.9.0:
   version "24.9.0"
@@ -3287,15 +3295,15 @@ pretty-format@^24.9.0:
     ansi-styles "^3.2.0"
     react-is "^16.8.4"
 
-pretty-format@^25.1.0:
-  version "25.1.0"
-  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-25.1.0.tgz#ed869bdaec1356fc5ae45de045e2c8ec7b07b0c8"
-  integrity sha512-46zLRSGLd02Rp+Lhad9zzuNZ+swunitn8zIpfD2B4OPCRLXbM87RJT2aBLBWYOznNUML/2l/ReMyWNC80PJBUQ==
+pretty-format@^26.0.0, pretty-format@^26.6.1:
+  version "26.6.1"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.6.1.tgz#af9a2f63493a856acddeeb11ba6bcf61989660a8"
+  integrity sha512-MeqqsP5PYcRBbGMvwzsyBdmAJ4EFX7pWFyl7x4+dMVg5pE0ZDdBIvEH2ergvIO+Gvwv1wh64YuOY9y5LuyY/GA==
   dependencies:
-    "@jest/types" "^25.1.0"
+    "@jest/types" "^26.6.1"
     ansi-regex "^5.0.0"
     ansi-styles "^4.0.0"
-    react-is "^16.12.0"
+    react-is "^17.0.1"
 
 process-nextick-args@~2.0.0:
   version "2.0.0"
@@ -3376,15 +3384,15 @@ rc@^1.2.7:
     minimist "^1.2.0"
     strip-json-comments "~2.0.1"
 
-react-is@^16.12.0:
-  version "16.12.0"
-  resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.12.0.tgz#2cc0fe0fba742d97fd527c42a13bec4eeb06241c"
-  integrity sha512-rPCkf/mWBtKc97aLL9/txD8DZdemK0vkA3JMLShjlJB3Pj3s+lpf1KaBzMfQrAmhMQB0n1cU/SUGgKKBCe837Q==
-
 react-is@^16.8.4:
   version "16.8.4"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.8.4.tgz#90f336a68c3a29a096a3d648ab80e87ec61482a2"
 
+react-is@^17.0.1:
+  version "17.0.1"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-17.0.1.tgz#5b3531bd76a645a4c9fb6e693ed36419e3301339"
+  integrity sha512-NAnt2iGDXohE5LI7uBnLnqvLQMtzhkiAOLXTmv+qnF9Ky7xAPcX8Up/xWIhxvLVGJvuLiNc4xQLtuqDRzb4fSA==
+
 read-pkg-up@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-4.0.0.tgz#1b221c6088ba7799601c808f91161c66e58f8978"