diff --git a/package.json b/package.json
index 973f60a..b107e0e 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": "^26.0.9",
     "@types/node": "^6.0.83",
     "jest": "^25.5.4",
     "ts-jest": "^25.5.1",
diff --git a/yarn.lock b/yarn.lock
index 44eb251..e3fa5f8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -531,15 +531,6 @@
     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"
-  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"
@@ -619,9 +610,9 @@
     "@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/jest@^26.0.9":
+  version "26.0.9"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.9.tgz#0543b57da5f0cd949c5f423a00c56c492289c989"
   dependencies:
     jest-diff "^25.2.1"
     pretty-format "^25.2.1"
@@ -1788,16 +1779,7 @@ 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:
+jest-diff@^25.2.1, jest-diff@^25.5.0:
   version "25.5.0"
   resolved "https://registry.yarnpkg.com/jest-diff/-/jest-diff-25.5.0.tgz#1dd26ed64f96667c068cef026b677dfa01afcfa9"
   dependencies:
@@ -2562,16 +2544,7 @@ 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:
+pretty-format@^25.2.1, pretty-format@^25.5.0:
   version "25.5.0"
   resolved "https://registry.yarnpkg.com/pretty-format/-/pretty-format-25.5.0.tgz#7873c1d774f682c34b8d48b6743a2bf2ac55791a"
   dependencies: