diff --git a/lambda/package.json b/lambda/package.json
index 3f18972..77cf178 100644
--- a/lambda/package.json
+++ b/lambda/package.json
@@ -21,7 +21,7 @@
     "dotenv": "^8.2.0",
     "eslint": "^7.22.0",
     "jest": "^26.6.3",
-    "ts-jest": "^26.4.4",
+    "ts-jest": "^26.5.4",
     "ts-node": "^9.1.1",
     "typescript": "^4.2.3"
   },
diff --git a/lambda/yarn.lock b/lambda/yarn.lock
index 803de35..0901321 100644
--- a/lambda/yarn.lock
+++ b/lambda/yarn.lock
@@ -581,7 +581,7 @@
   dependencies:
     "@types/istanbul-lib-report" "*"
 
-"@types/jest@26.x", "@types/jest@^26.0.20":
+"@types/jest@^26.0.20":
   version "26.0.20"
   resolved "https://registry.yarnpkg.com/@types/jest/-/jest-26.0.20.tgz#cd2f2702ecf69e86b586e1f5223a60e454056307"
   integrity sha512-9zi2Y+5USJRxd0FsahERhBwlcvFh6D2GLQnY2FH2BzK8J9s9omvNHIbvABwIluXa0fD8XVKMLTO0aOEuUfACAA==
@@ -2887,11 +2887,6 @@ lodash.isplainobject@^4.0.6:
   resolved "https://registry.yarnpkg.com/lodash.isplainobject/-/lodash.isplainobject-4.0.6.tgz#7c526a52d89b45c45cc690b88163be0497f550cb"
   integrity sha1-fFJqUtibRcRcxpC4gWO+BJf1UMs=
 
-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.sortby@^4.7.0:
   version "4.7.0"
   resolved "https://registry.yarnpkg.com/lodash.sortby/-/lodash.sortby-4.7.0.tgz#edd14c824e2cc9c1e0b0a1b42bb5210516a42438"
@@ -2902,7 +2897,7 @@ lodash.union@^4.6.0:
   resolved "https://registry.yarnpkg.com/lodash.union/-/lodash.union-4.6.0.tgz#48bb5088409f16f1821666641c44dd1aaae3cd88"
   integrity sha1-SLtQiECfFvGCFmZkHETdGqrjzYg=
 
-lodash@^4.17.14, lodash@^4.17.19, lodash@^4.17.20, lodash@^4.17.21:
+lodash@4.x, lodash@^4.17.14, lodash@^4.17.19, lodash@^4.17.20, lodash@^4.17.21:
   version "4.17.21"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.21.tgz#679591c564c3bffaae8454cf0b3df370c3d6911c"
   integrity sha512-v2kDEe57lecTulaDIuNTPy3Ry4gLGJ6Z1O3vE1krgXZNrsQ+LFTGHVxVjcXPs17LhbZVGedAJv8XZ1tvj5FvSg==
@@ -4087,18 +4082,17 @@ tr46@^2.0.2:
   dependencies:
     punycode "^2.1.1"
 
-ts-jest@^26.4.4:
-  version "26.4.4"
-  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.4.4.tgz#61f13fb21ab400853c532270e52cc0ed7e502c49"
-  integrity sha512-3lFWKbLxJm34QxyVNNCgXX1u4o/RV0myvA2y2Bxm46iGIjKlaY0own9gIckbjZJPn+WaJEnfPPJ20HHGpoq4yg==
+ts-jest@^26.5.4:
+  version "26.5.4"
+  resolved "https://registry.yarnpkg.com/ts-jest/-/ts-jest-26.5.4.tgz#207f4c114812a9c6d5746dd4d1cdf899eafc9686"
+  integrity sha512-I5Qsddo+VTm94SukBJ4cPimOoFZsYTeElR2xy6H2TOVs+NsvgYglW8KuQgKoApOKuaU/Ix/vrF9ebFZlb5D2Pg==
   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"