diff --git a/package.json b/package.json
index 973f60a..5b95df2 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,7 @@
   },
   "devDependencies": {
     "@types/d3-dsv": "^1.0.36",
-    "@types/jest": "^25.2.3",
+    "@types/jest": "^26.0.23",
     "@types/node": "^6.0.83",
     "jest": "^25.5.4",
     "ts-jest": "^25.5.1",
diff --git a/yarn.lock b/yarn.lock
index 44eb251..56e2bd7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -531,23 +531,24 @@
     source-map "^0.6.1"
     write-file-atomic "^3.0.0"
 
-"@jest/types@^25.4.0":
-  version "25.4.0"
-  resolved "https://registry.yarnpkg.com/@jest/types/-/types-25.4.0.tgz#5afeb8f7e1cba153a28e5ac3c9fe3eede7206d59"
+"@jest/types@^25.5.0":
+  version "25.5.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-25.5.0.tgz#4d6a4793f7b9599fc3680877b856a97dbccf2a9d"
   dependencies:
     "@types/istanbul-lib-coverage" "^2.0.0"
     "@types/istanbul-reports" "^1.1.1"
     "@types/yargs" "^15.0.0"
     chalk "^3.0.0"
 
-"@jest/types@^25.5.0":
-  version "25.5.0"
-  resolved "https://registry.yarnpkg.com/@jest/types/-/types-25.5.0.tgz#4d6a4793f7b9599fc3680877b856a97dbccf2a9d"
+"@jest/types@^26.6.2":
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.6.2.tgz#bef5a532030e1d88a2f5a6d933f84e97226ed48e"
   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"
 
 "@sinonjs/commons@^1.7.0":
   version "1.7.1"
@@ -619,12 +620,18 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@^25.2.3":
-  version "25.2.3"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-25.2.3.tgz#33d27e4c4716caae4eced355097a47ad363fdcaf"
+"@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"
   dependencies:
-    jest-diff "^25.2.1"
-    pretty-format "^25.2.1"
+    "@types/istanbul-lib-report" "*"
+
+"@types/jest@^26.0.23":
+  version "26.0.23"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.23.tgz#a1b7eab3c503b80451d019efb588ec63522ee4e7"
+  dependencies:
+    jest-diff "^26.0.0"
+    pretty-format "^26.0.0"
 
 "@types/node@*":
   version "14.0.11"
@@ -971,6 +978,13 @@ chalk@^3.0.0:
     ansi-styles "^4.1.0"
     supports-color "^7.1.0"
 
+chalk@^4.0.0:
+  version "4.1.1"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-4.1.1.tgz#c80b3fab28bf6371e6863325eee67e618b77e6ad"
+  dependencies:
+    ansi-styles "^4.1.0"
+    supports-color "^7.1.0"
+
 ci-info@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/ci-info/-/ci-info-2.0.0.tgz#67a9e964be31a51e15e5010d58e6f12834002f46"
@@ -1172,6 +1186,10 @@ diff-sequences@^25.2.6:
   version "25.2.6"
   resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-25.2.6.tgz#5f467c00edd35352b7bca46d7927d60e687a76dd"
 
+diff-sequences@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/diff-sequences/-/diff-sequences-26.6.2.tgz#48ba99157de1923412eed41db6b6d4aa9ca7c0b1"
+
 diff@^4.0.1:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/diff/-/diff-4.0.1.tgz#0c667cb467ebbb5cea7f14f135cc2dba7780a8ff"
@@ -1788,15 +1806,6 @@ jest-config@^25.5.4:
     pretty-format "^25.5.0"
     realpath-native "^2.0.0"
 
-jest-diff@^25.2.1:
-  version "25.4.0"
-  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.4.0.tgz#260b70f19a46c283adcad7f081cae71eb784a634"
-  dependencies:
-    chalk "^3.0.0"
-    diff-sequences "^25.2.6"
-    jest-get-type "^25.2.6"
-    pretty-format "^25.4.0"
-
 jest-diff@^25.5.0:
   version "25.5.0"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.5.0.tgz#1dd26ed64f96667c068cef026b677dfa01afcfa9"
@@ -1806,6 +1815,15 @@ jest-diff@^25.5.0:
     jest-get-type "^25.2.6"
     pretty-format "^25.5.0"
 
+jest-diff@^26.0.0:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-26.6.2.tgz#1aa7468b52c3a68d7d5c5fdcdfcd5e49bd164394"
+  dependencies:
+    chalk "^4.0.0"
+    diff-sequences "^26.6.2"
+    jest-get-type "^26.3.0"
+    pretty-format "^26.6.2"
+
 jest-docblock@^25.3.0:
   version "25.3.0"
   resolved "https://registry.yarnpkg.com/jest-docblock/-/jest-docblock-25.3.0.tgz#8b777a27e3477cd77a168c05290c471a575623ef"
@@ -1848,6 +1866,10 @@ jest-get-type@^25.2.6:
   version "25.2.6"
   resolved "https://registry.yarnpkg.com/jest-get-type/-/jest-get-type-25.2.6.tgz#0b0a32fab8908b44d508be81681487dbabb8d877"
 
+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"
+
 jest-haste-map@^25.5.1:
   version "25.5.1"
   resolved "https://registry.yarnpkg.com/jest-haste-map/-/jest-haste-map-25.5.1.tgz#1df10f716c1d94e60a1ebf7798c9fb3da2620943"
@@ -2562,15 +2584,6 @@ prelude-ls@~1.1.2:
   version "1.1.2"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.1.2.tgz#21932a549f5e52ffd9a827f570e04be62a97da54"
 
-pretty-format@^25.2.1, pretty-format@^25.4.0:
-  version "25.4.0"
-  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-25.4.0.tgz#c58801bb5c4926ff4a677fe43f9b8b99812c7830"
-  dependencies:
-    "@jest/types" "^25.4.0"
-    ansi-regex "^5.0.0"
-    ansi-styles "^4.0.0"
-    react-is "^16.12.0"
-
 pretty-format@^25.5.0:
   version "25.5.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-25.5.0.tgz#7873c1d774f682c34b8d48b6743a2bf2ac55791a"
@@ -2580,6 +2593,15 @@ pretty-format@^25.5.0:
     ansi-styles "^4.0.0"
     react-is "^16.12.0"
 
+pretty-format@^26.0.0, pretty-format@^26.6.2:
+  version "26.6.2"
+  resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-26.6.2.tgz#e35c2705f14cb7fe2fe94fa078345b444120fc93"
+  dependencies:
+    "@jest/types" "^26.6.2"
+    ansi-regex "^5.0.0"
+    ansi-styles "^4.0.0"
+    react-is "^17.0.1"
+
 prompts@^2.0.1:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/prompts/-/prompts-2.0.3.tgz#c5ccb324010b2e8f74752aadceeb57134c1d2522"
@@ -2618,6 +2640,10 @@ react-is@^16.12.0:
   version "16.13.1"
   resolved "https://registry.yarnpkg.com/react-is/-/react-is-16.13.1.tgz#789729a4dc36de2999dc156dd6c1d9c18cea56a4"
 
+react-is@^17.0.1:
+  version "17.0.2"
+  resolved "https://registry.yarnpkg.com/react-is/-/react-is-17.0.2.tgz#e691d4a8e9c789365655539ab372762b0efb54f0"
+
 read-pkg-up@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/read-pkg-up/-/read-pkg-up-7.0.1.tgz#f3a6135758459733ae2b95638056e1854e7ef507"