diff --git a/projects/rulesets-base/package.json b/projects/rulesets-base/package.json
index e551cb962c..b958199a33 100644
--- a/projects/rulesets-base/package.json
+++ b/projects/rulesets-base/package.json
@@ -25,7 +25,6 @@
     "@useoptic/json-pointer-helpers": "workspace:*",
     "@useoptic/openapi-utilities": "workspace:*",
     "ajv": "^8.6.0",
-    "lodash.pick": "^4.4.0",
     "node-fetch": "^2.6.7",
     "semver": "^7.5.4"
   },
@@ -37,7 +36,6 @@
     "@types/babel__core": "^7",
     "@types/babel__preset-env": "^7",
     "@types/json-stable-stringify": "^1.0.33",
-    "@types/lodash.pick": "^4",
     "@types/node": "^18.0.0",
     "babel-jest": "^29.3.1",
     "jest": "^29.3.1",
diff --git a/projects/rulesets-base/src/rule-runner/assertions.ts b/projects/rulesets-base/src/rule-runner/assertions.ts
index 029279da2d..daab065ba7 100644
--- a/projects/rulesets-base/src/rule-runner/assertions.ts
+++ b/projects/rulesets-base/src/rule-runner/assertions.ts
@@ -5,7 +5,6 @@ import {
   Severity,
   UserError,
 } from '@useoptic/openapi-utilities';
-import pick from 'lodash.pick';
 import { RuleError } from '../errors';
 import {
   RegisterAssertion,
@@ -50,16 +49,19 @@ export type AssertionResult =
     };
 
 const sanitizeFact = (fact: IFact): IFact =>
-  pick(fact, 'value', 'location') as IFact;
+  ({
+    value: fact.value,
+    location: fact.location,
+  }) as IFact;
+
 const sanitizeChange = (change: IChange): IChange =>
-  pick(
-    change,
-    'changeType',
-    'added',
-    'removed',
-    'changed',
-    'location'
-  ) as IChange;
+  ({
+    changeType: change.changeType,
+    added: change.added,
+    removed: change.removed,
+    changed: change.changed,
+    location: change.location,
+  }) as IChange;
 
 class AssertionRunner<T extends AssertionType> implements Assertions<T> {
   private requirementAssertions: Assertion<T>[];
diff --git a/yarn.lock b/yarn.lock
index 3599a273b0..a42051b7a9 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3877,14 +3877,12 @@ __metadata:
     "@types/babel__core": "npm:^7"
     "@types/babel__preset-env": "npm:^7"
     "@types/json-stable-stringify": "npm:^1.0.33"
-    "@types/lodash.pick": "npm:^4"
     "@types/node": "npm:^18.0.0"
     "@useoptic/json-pointer-helpers": "workspace:*"
     "@useoptic/openapi-utilities": "workspace:*"
     ajv: "npm:^8.6.0"
     babel-jest: "npm:^29.3.1"
     jest: "npm:^29.3.1"
-    lodash.pick: "npm:^4.4.0"
     node-fetch: "npm:^2.6.7"
     semver: "npm:^7.5.4"
     ts-jest: "npm:^29.0.3"
@@ -8335,13 +8333,6 @@ __metadata:
   languageName: node
   linkType: hard
 
-"lodash.pick@npm:^4.4.0":
-  version: 4.4.0
-  resolution: "lodash.pick@npm:4.4.0"
-  checksum: 10c0/a04c460b95d1aaa44e9513d1dacf72ea74d838da843e45831de9de64c303f13cdde1859702a6f4dcef417816898ffd47c6ae0614c957ac70245bed2809b8d2e2
-  languageName: node
-  linkType: hard
-
 "lodash.set@npm:^4.3.2":
   version: 4.3.2
   resolution: "lodash.set@npm:4.3.2"