diff --git a/packages/netlify-cms-proxy-server/package.json b/packages/netlify-cms-proxy-server/package.json
index 9de78269..eb7d308e 100644
--- a/packages/netlify-cms-proxy-server/package.json
+++ b/packages/netlify-cms-proxy-server/package.json
@@ -43,7 +43,7 @@
     "jest": "^27.0.0",
     "netlify-cms-lib-util": "^2.13.1",
     "nodemon": "^2.0.2",
-    "ts-jest": "^26.0.0",
+    "ts-jest": "^27.0.0",
     "ts-loader": "^8.0.0",
     "ts-node": "^10.0.0",
     "tsconfig-paths-webpack-plugin": "^3.2.0",
diff --git a/yarn.lock b/yarn.lock
index 35e7fb95..282e64b8 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -282,12 +282,7 @@
     chalk "^2.0.0"
     js-tokens "^4.0.0"
 
-"@babel/parser@^7.0.0", "@babel/parser@^7.1.0", "@babel/parser@^7.12.13", "@babel/parser@^7.14.2", "@babel/parser@^7.14.3":
-  version "7.14.4"
-  resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.14.4.tgz#a5c560d6db6cd8e6ed342368dea8039232cbab18"
-  integrity sha512-ArliyUsWDUqEGfWcmzpGUzNfLxTdTp6WU4IuP6QFSp9gGfWS6boxFCkJSJ/L4+RG8z/FnIU3WxCk6hPL9SSWeA==
-
-"@babel/parser@^7.7.2":
+"@babel/parser@^7.0.0", "@babel/parser@^7.1.0", "@babel/parser@^7.12.13", "@babel/parser@^7.14.2", "@babel/parser@^7.14.3", "@babel/parser@^7.7.2":
   version "7.14.4"
   resolved "https://registry.yarnpkg.com/@babel/parser/-/parser-7.14.4.tgz#a5c560d6db6cd8e6ed342368dea8039232cbab18"
   integrity sha512-ArliyUsWDUqEGfWcmzpGUzNfLxTdTp6WU4IuP6QFSp9gGfWS6boxFCkJSJ/L4+RG8z/FnIU3WxCk6hPL9SSWeA==
@@ -11312,19 +11307,7 @@ jest-snapshot@^27.0.2:
     pretty-format "^27.0.2"
     semver "^7.3.2"
 
-jest-util@^26.1.0:
-  version "26.6.2"
-  resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-26.6.2.tgz#907535dbe4d5a6cb4c47ac9b926f6af29576cbc1"
-  integrity sha512-MDW0fKfsn0OI7MS7Euz6h8HNDXVQ0gaM9uW6RjfDmd1DAFcaxX9OqIakHIqhbnmF08Cf2DLDG+ulq8YQQ0Lp0Q==
-  dependencies:
-    "@jest/types" "^26.6.2"
-    "@types/node" "*"
-    chalk "^4.0.0"
-    graceful-fs "^4.2.4"
-    is-ci "^2.0.0"
-    micromatch "^4.0.2"
-
-jest-util@^27.0.2:
+jest-util@^27.0.0, jest-util@^27.0.2:
   version "27.0.2"
   resolved "https://registry.yarnpkg.com/jest-util/-/jest-util-27.0.2.tgz#fc2c7ace3c75ae561cf1e5fdb643bf685a5be7c7"
   integrity sha512-1d9uH3a00OFGGWSibpNYr+jojZ6AckOMCXV2Z4K3YXDnzpkAaXQyIpY14FOJPiUmil7CD+A6Qs+lnnh6ctRbIA==
@@ -17731,15 +17714,15 @@ ts-invariant@^0.4.0:
   dependencies:
     tslib "^1.9.3"
 
-ts-jest@^26.0.0:
-  version "26.5.6"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.6.tgz#c32e0746425274e1dfe333f43cd3c800e014ec35"
-  integrity sha512-rua+rCP8DxpA8b4DQD/6X2HQS8Zy/xzViVYfEs2OQu68tkCuKLV0Md8pmX55+W24uRIyAsf/BajRfxOs+R2MKA==
+ts-jest@^27.0.0:
+  version "27.0.2"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-27.0.2.tgz#acc1525d5fd25c107c777c3b80a11365db579aa1"
+  integrity sha512-pozjHOOfm+sbv9kXCvTFVyDntWvuJztzkNFql/akD75hSMZ2jsbidVauOhBRImAopXohqcLtPK/NTTIS8Y49Ug==
   dependencies:
     bs-logger "0.x"
     buffer-from "1.x"
     fast-json-stable-stringify "2.x"
-    jest-util "^26.1.0"
+    jest-util "^27.0.0"
     json5 "2.x"
     lodash "4.x"
     make-error "1.x"