diff --git a/package.json b/package.json
index d74f135..6daaae9 100755
--- a/package.json
+++ b/package.json
@@ -80,7 +80,7 @@
     "jest": "26.0.1",
     "prettier": "1.19.1",
     "react-test-renderer": "16.13.1",
-    "ts-jest": "26.0.0",
+    "ts-jest": "26.3.0",
     "typescript": "3.8.3"
   },
   "homepage": "https://github.com/gatsbyjs/gatsby-starter-blog#readme",
diff --git a/yarn.lock b/yarn.lock
index d9b8e4f..7342c80 100755
--- a/yarn.lock
+++ b/yarn.lock
@@ -2525,6 +2525,17 @@
     "@types/yargs" "^15.0.0"
     chalk "^4.0.0"
 
+"@jest/types@^26.3.0":
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/@jest/types/-/types-26.3.0.tgz#97627bf4bdb72c55346eef98e3b3f7ddc4941f71"
+  integrity sha512-BDPG23U0qDeAvU4f99haztXwdAg3hz4El95LkAM+tHAqqhiVzRpEGHHU8EDxT/AnxOrA65YjLBwDahdJ9pTLJQ==
+  dependencies:
+    "@types/istanbul-lib-coverage" "^2.0.0"
+    "@types/istanbul-reports" "^3.0.0"
+    "@types/node" "*"
+    "@types/yargs" "^15.0.0"
+    chalk "^4.0.0"
+
 "@jimp/bmp@^0.6.4":
   version "0.6.4"
   resolved "https://registry.yarnpkg.com/@jimp/bmp/-/bmp-0.6.4.tgz#0f4b94486e979d82c83e1e87cd00b756afb26e49"
@@ -3037,6 +3048,13 @@
     "@types/istanbul-lib-coverage" "*"
     "@types/istanbul-lib-report" "*"
 
+"@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@*":
   version "25.1.4"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-25.1.4.tgz#9e9f1e59dda86d3fd56afce71d1ea1b331f6f760"
@@ -3053,6 +3071,14 @@
     jest-diff "^25.2.1"
     pretty-format "^25.2.1"
 
+"@types/jest@26.x":
+  version "26.0.10"
+  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.10.tgz#8faf7e9756c033c39014ae76a7329efea00ea607"
+  integrity sha512-i2m0oyh8w/Lum7wWK/YOZJakYF8Mx08UaKA1CtbmFeDquVhAEdA7znacsVSf2hJ1OQ/OfVMGN90pw/AtzF8s/Q==
+  dependencies:
+    jest-diff "^25.2.1"
+    pretty-format "^25.2.1"
+
 "@types/json-schema@^7.0.3":
   version "7.0.4"
   resolved "https://registry.yarnpkg.com/@types/json-schema/-/json-schema-7.0.4.tgz#38fd73ddfd9b55abb1e1b2ed578cb55bd7b7d339"
@@ -10598,6 +10624,18 @@ jest-snapshot@^26.0.1:
     pretty-format "^26.0.1"
     semver "^7.3.2"
 
+jest-util@26.x:
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-26.3.0.tgz#a8974b191df30e2bf523ebbfdbaeb8efca535b3e"
+  integrity sha512-4zpn6bwV0+AMFN0IYhH/wnzIQzRaYVrz1A8sYnRnj4UXDXbOVtWmlaZkO9mipFqZ13okIfN87aDoJWB7VH6hcw==
+  dependencies:
+    "@jest/types" "^26.3.0"
+    "@types/node" "*"
+    chalk "^4.0.0"
+    graceful-fs "^4.2.4"
+    is-ci "^2.0.0"
+    micromatch "^4.0.2"
+
 jest-util@^26.0.1:
   version "26.0.1"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-26.0.1.tgz#72c4c51177b695fdd795ca072a6f94e3d7cef00a"
@@ -11615,14 +11653,6 @@ methods@~1.1.2:
   resolved "https://registry.yarnpkg.com/methods/-/methods-1.1.2.tgz#5529a4d67654134edcc5266656835b0f851afcee"
   integrity sha1-VSmk1nZUE07cxSZmVoNbD4Ua/O4=
 
-micromatch@4.x, micromatch@^4.0.2:
-  version "4.0.2"
-  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.2.tgz#4fcb0999bf9fbc2fcbdd212f6d629b9a56c39259"
-  integrity sha512-y7FpHSbMUMoyPbYUSzO6PaZ6FyRnQOpHuKwbo1G+Knck95XVU4QAiKdGEnj5wwoS7PlOgthX/09u5iFJ+aYf5Q==
-  dependencies:
-    braces "^3.0.1"
-    picomatch "^2.0.5"
-
 micromatch@^3.1.10, micromatch@^3.1.4, micromatch@^3.1.8:
   version "3.1.10"
   resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-3.1.10.tgz#70859bc95c9840952f359a068a3fc49f9ecfac23"
@@ -11642,6 +11672,14 @@ micromatch@^3.1.10, micromatch@^3.1.4, micromatch@^3.1.8:
     snapdragon "^0.8.1"
     to-regex "^3.0.2"
 
+micromatch@^4.0.2:
+  version "4.0.2"
+  resolved "https://registry.yarnpkg.com/micromatch/-/micromatch-4.0.2.tgz#4fcb0999bf9fbc2fcbdd212f6d629b9a56c39259"
+  integrity sha512-y7FpHSbMUMoyPbYUSzO6PaZ6FyRnQOpHuKwbo1G+Knck95XVU4QAiKdGEnj5wwoS7PlOgthX/09u5iFJ+aYf5Q==
+  dependencies:
+    braces "^3.0.1"
+    picomatch "^2.0.5"
+
 miller-rabin@^4.0.0:
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/miller-rabin/-/miller-rabin-4.0.1.tgz#f080351c865b0dc562a8462966daa53543c78a4d"
@@ -16262,18 +16300,19 @@ ts-invariant@^0.4.0:
   dependencies:
     tslib "^1.9.3"
 
-ts-jest@26.0.0:
-  version "26.0.0"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.0.0.tgz#957b802978249aaf74180b9dcb17b4fd787ad6f3"
-  integrity sha512-eBpWH65mGgzobuw7UZy+uPP9lwu+tPp60o324ASRX4Ijg8UC5dl2zcge4kkmqr2Zeuk9FwIjvCTOPuNMEyGWWw==
+ts-jest@26.3.0:
+  version "26.3.0"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.3.0.tgz#6b2845045347dce394f069bb59358253bc1338a9"
+  integrity sha512-Jq2uKfx6bPd9+JDpZNMBJMdMQUC3sJ08acISj8NXlVgR2d5OqslEHOR2KHMgwymu8h50+lKIm0m0xj/ioYdW2Q==
   dependencies:
+    "@types/jest" "26.x"
     bs-logger "0.x"
     buffer-from "1.x"
     fast-json-stable-stringify "2.x"
+    jest-util "26.x"
     json5 "2.x"
     lodash.memoize "4.x"
     make-error "1.x"
-    micromatch "4.x"
     mkdirp "1.x"
     semver "7.x"
     yargs-parser "18.x"