diff --git a/package.json b/package.json
index 267aa16..3490e9c 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
         "tslint-config-prettier": "1.18.0",
         "typescript": "4.0.3",
         "typedoc": "0.19.2",
-        "ts-jest": "26.4.0",
+        "ts-jest": "26.5.6",
         "jest": "26.4.2",
         "jest-extended": "0.11.5",
         "regenerator-runtime": "0.13.7",
diff --git a/yarn.lock b/yarn.lock
index 19eccdf..17ea33a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -863,14 +863,6 @@
     jest-diff "^25.2.1"
     pretty-format "^25.2.1"
 
-"@types/jest@26.x":
-  version "26.0.13"
-  resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.13.tgz#5a7b9d5312f5dd521a38329c38ee9d3802a0b85e"
-  integrity sha512-sCzjKow4z9LILc6DhBvn5AkIfmQzDZkgtVVKmGwVrs5tuid38ws281D4l+7x1kP487+FlKDh5kfMZ8WSPAdmdA==
-  dependencies:
-    jest-diff "^25.2.1"
-    pretty-format "^25.2.1"
-
 "@types/long@*":
   version "4.0.1"
   resolved "https://registry.yarnpkg.com/@types/long/-/long-4.0.1.tgz#459c65fa1867dafe6a8f322c4c51695663cc55e9"
@@ -3520,11 +3512,6 @@ lodash.isstring@^4.0.1:
   resolved "https://registry.yarnpkg.com/lodash.isstring/-/lodash.isstring-4.0.1.tgz#d527dfb5456eca7cc9bb95d5daeaf88ba54a5451"
   integrity sha1-1SfftUVuynzJu5XV2ur4i6VKVFE=
 
-lodash.memoize@4.x:
-  version "4.1.2"
-  resolved "https://registry.yarnpkg.com/lodash.memoize/-/lodash.memoize-4.1.2.tgz#bcc6c49a42a2840ed997f323eada5ecd182e0bfe"
-  integrity sha1-vMbEmkKihA7Zl/Mj6tpezRguC/4=
-
 lodash.set@^4.3.2:
   version "4.3.2"
   resolved "https://registry.yarnpkg.com/lodash.set/-/lodash.set-4.3.2.tgz#d8757b1da807dde24816b0d6a84bea1a76230b23"
@@ -3540,6 +3527,11 @@ lodash.sumby@^4.6.0:
   resolved "https://registry.yarnpkg.com/lodash.sumby/-/lodash.sumby-4.6.0.tgz#7d87737ddb216da2f7e5e7cd2dd9c403a7887346"
   integrity sha1-fYdzfdshbaL35efNLdnEA6eIc0Y=
 
+lodash@4.x:
+  version "4.17.21"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
+  integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
+
 lodash@^4.17.13, lodash@^4.17.15:
   version "4.17.15"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
@@ -4891,18 +4883,17 @@ trim-newlines@^3.0.0:
   resolved "https://registry.yarnpkg.com/trim-newlines/-/trim-newlines-3.0.0.tgz#79726304a6a898aa8373427298d54c2ee8b1cb30"
   integrity sha512-C4+gOpvmxaSMKuEf9Qc134F1ZuOHVXKRbtEflf4NTtuuJDEIJ9p5PXsalL8SkeRw+qit1Mo+yuvMPAKwWg/1hA==
 
-ts-jest@26.4.0:
-  version "26.4.0"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.4.0.tgz#903c7827f3d3bc33efc2f91be294b164400c32e3"
-  integrity sha512-ofBzoCqf6Nv/PoWb/ByV3VNKy2KJSikamOBxvR3E6eVdIw10GwAXoyvMWXXjZJK2s6S27ZE8fI+JBTnGaovl6Q==
+ts-jest@26.5.6:
+  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==
   dependencies:
-    "@types/jest" "26.x"
     bs-logger "0.x"
     buffer-from "1.x"
     fast-json-stable-stringify "2.x"
     jest-util "^26.1.0"
     json5 "2.x"
-    lodash.memoize "4.x"
+    lodash "4.x"
     make-error "1.x"
     mkdirp "1.x"
     semver "7.x"