diff --git a/src/helpers/conformance/conformance.ts b/src/helpers/conformance/conformance.ts
index a80566a..e178fa3 100644
--- a/src/helpers/conformance/conformance.ts
+++ b/src/helpers/conformance/conformance.ts
@@ -1,12 +1,14 @@
-/**
- * © Copyright Outburn Ltd. 2022-2024 All Rights Reserved
- *   Project name: FUME-COMMUNITY
- */
+/**
+ * © Copyright Outburn Ltd. 2022-2024 All Rights Reserved
+ *   Project name: FUME-COMMUNITY
+ */
 
-import config from '../../config';
-import { getFhirClient } from '../fhirServer';
-import expressions from '../jsonataExpression';
-import { getLogger } from '../logger';
+import fs from 'fs-extra';
+
+import config from '../../config';
+import { getFhirClient } from '../fhirServer';
+import expressions from '../jsonataExpression';
+import { getLogger } from '../logger';
 import { getFhirPackageIndex } from './loadFhirPackageIndex';
 
 export const getStructureDefinition = async (definitionId: string): Promise<any> => {
@@ -26,8 +28,7 @@ export const getStructureDefinition = async (definitionId: string): Promise<any>
     throw (error);
   } else {
     const path: string = indexed;
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const fullDef = require(path); // load file
+    const fullDef = JSON.parse(fs.readFileSync(path).toString()); // load file
     return fullDef;
   };
 };
diff --git a/src/helpers/conformance/loadFhirPackageIndex.ts b/src/helpers/conformance/loadFhirPackageIndex.ts
index 02b6075..d5340a1 100644
--- a/src/helpers/conformance/loadFhirPackageIndex.ts
+++ b/src/helpers/conformance/loadFhirPackageIndex.ts
@@ -20,8 +20,7 @@ const createPackageIndexFile = (packagePath: string) => {
     const fileList = fs.readdirSync(path.join(packagePath, 'package'));
     const files = fileList.flatMap((file: string) => {
       if (file.endsWith('.json') && file !== 'package.json') {
-        // eslint-disable-next-line @typescript-eslint/no-var-requires
-        const content = require(path.join(packagePath, 'package', file));
+        const content = JSON.parse(fs.readFileSync(path.join(packagePath, 'package', file)).toString());
         const indexEntry = {
           filename: file,
           resourceType: content.resourceType,
@@ -58,8 +57,8 @@ const buildFhirCacheIndex = async () => {
       return {
         package: pack,
         path: path.join(cachePath, pack, 'package'),
-        packageManifest: require(path.join(cachePath, pack, 'package', 'package.json')),
-        packageIndex: require(path.join(cachePath, pack, 'package', '.index.json'))
+        packageManifest: JSON.parse(fs.readFileSync(path.join(cachePath, pack, 'package', 'package.json')).toString()),
+        packageIndex: JSON.parse(fs.readFileSync(path.join(cachePath, pack, 'package', '.index.json')).toString())
       };
     } else {
       getLogger().warn(`Folder '${pack}' found in the local FHIR cache does not seem to be a FHIR package (no package.json file found). Skipping it...`);
@@ -72,8 +71,7 @@ const buildFhirCacheIndex = async () => {
     pathJoin: path.join,
     require: (filePath: string) => {
       try {
-        // eslint-disable-next-line @typescript-eslint/no-var-requires
-        const payload = require(filePath);
+        const payload = JSON.parse(fs.readFileSync(filePath).toString());
         return payload;
       } catch (e) {
         getLogger().error(e);
@@ -93,13 +91,12 @@ const parseFhirPackageIndex = async (): Promise<IFhirPackageIndex> => {
   if (fs.existsSync(fumeIndexPath)) {
     getLogger().info(`Found global package index file at ${fumeIndexPath}`);
     const dirList: string[] = getCachedPackageDirs();
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const currentIndex = require(fumeIndexPath);
+    const currentIndex = JSON.parse(fs.readFileSync(fumeIndexPath).toString());
     const currentPackages = await expressions.extractCurrentPackagesFromIndex.evaluate(currentIndex);
     const diff: string[] = await expressions.checkPackagesMissingFromIndex.evaluate({ dirList, packages: currentPackages });
     if (diff.length === 0) {
       getLogger().info('Global package index file is up-to-date');
-      return require(fumeIndexPath);
+      return JSON.parse(fs.readFileSync(fumeIndexPath).toString());
     } else {
       getLogger().info('Global package index file is outdated');
     };
diff --git a/src/helpers/jsonataFunctions/getStructureDefinition.ts b/src/helpers/jsonataFunctions/getStructureDefinition.ts
index c44269e..a6769f1 100644
--- a/src/helpers/jsonataFunctions/getStructureDefinition.ts
+++ b/src/helpers/jsonataFunctions/getStructureDefinition.ts
@@ -2,6 +2,8 @@
  * © Copyright Outburn Ltd. 2022-2024 All Rights Reserved
  *   Project name: FUME-COMMUNITY
  */
+import fs from 'fs-extra';
+
 import config from '../../config';
 import { getFhirPackageIndex } from '../conformance';
 import fhirFuncs from '../fhirFunctions';
@@ -34,9 +36,7 @@ export const getStructureDefinition = (definitionId: string): any => {
   try {
     const path: string = getStructureDefinitionPath(definitionId);
 
-    // eslint-disable-next-line @typescript-eslint/no-var-requires
-    const fullDef = require(path); // load file
-    // getLogger().info(`Definition loaded: ${path}`);
+    const fullDef = JSON.parse(fs.readFileSync(path).toString()); // load file
     return fullDef;
   } catch (e) {
     return thrower.throwParseError(`A Problem occured while getting the structure definition of '${definitionId}'. The error is: ${e}`);