diff --git a/.github/workflows/publish.yml b/.github/workflows/publish.yml
index cc9ef81..68f20f5 100644
--- a/.github/workflows/publish.yml
+++ b/.github/workflows/publish.yml
@@ -15,15 +15,17 @@ jobs:
       FORCE_COLOR: '1'
     steps:
       - name: Checkout repo
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # 5.0.0
-      - name: Use Node.js 24
-        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # 5.0.0
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # 6.0.3
+      - name: Use Node.js 26
+        uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # 6.4.0
         with:
-          node-version: 24
+          node-version: 26
           registry-url: https://registry.npmjs.org/
+      - name: Enable Corepack
+        run: corepack enable
       - name: Install packages
         run: YARN_ENABLE_COLORS=true yarn install
       - name: Publish packages to npm
         run: |
-          npm --version
-          npm publish
+          yarn --version
+          yarn npm publish
diff --git a/.yarn/install-state.gz b/.yarn/install-state.gz
new file mode 100644
index 0000000..bcffcd6
Binary files /dev/null and b/.yarn/install-state.gz differ
diff --git a/.yarnrc.yml b/.yarnrc.yml
new file mode 100644
index 0000000..d1ae5d6
--- /dev/null
+++ b/.yarnrc.yml
@@ -0,0 +1,9 @@
+approvedGitRepositories: []
+
+enableScripts: true
+
+nodeLinker: node-modules
+
+npmMinimalAgeGate: 10080
+
+npmRegistryServer: "https://registry.npmjs.org"
diff --git a/index.js b/index.js
index 3bd639c..49b3545 100644
--- a/index.js
+++ b/index.js
@@ -1,5 +1,5 @@
-const sourceMap = require('source-map');
-const acorn = require('acorn');
+import sourceMap from 'source-map';
+import * as acorn from 'acorn';
 
 /**
  * @type {{
@@ -26,12 +26,12 @@ let LocationSpan;
  *   sourcesContent: (!Array<string>|undefined),
  *   names: !Array<string>,
  *   mappings: string
- * }} 
+ * }}
  */
 let SourceMap;
 
 /**
- * @param {!string} input 
+ * @param {!string} input
  * @return {!Array<number>} Array of indexes indicating the index in the original string of start each new line
  */
 function getLineIndexes(input) {
@@ -45,7 +45,7 @@ function getLineIndexes(input) {
 }
 
 /**
- * @param {number} index 
+ * @param {number} index
  * @param {!Array<number>} lineIndexes
  * @return {number}
  */
@@ -61,8 +61,8 @@ function getLineNumForIndex(index, lineIndexes) {
 }
 
 /**
- * @param {!LocationSpan} a 
- * @param {!LocationSpan} b 
+ * @param {!LocationSpan} a
+ * @param {!LocationSpan} b
  * @return {number}
  */
 function compareLocations(a, b) {
@@ -81,7 +81,7 @@ function compareLocations(a, b) {
   return a.id - b.id;
 }
 
-class StringReplaceSourceMap {
+export default class StringReplaceSourceMap {
   /**
    * @param {!string} originalString
    * @param {string|SourceMap|null} originalSourceMap
@@ -117,9 +117,9 @@ class StringReplaceSourceMap {
   }
 
   /**
-   * @param {number} start 
-   * @param {number} end 
-   * @param {?string=} newString 
+   * @param {number} start
+   * @param {number} end
+   * @param {?string=} newString
    */
   replace(start, end, newString) {
     const lineIndexesForNewString = getLineIndexes(newString);
@@ -178,7 +178,7 @@ class StringReplaceSourceMap {
     let updatedString = this.string;
     for (let i = locationUpdates.length - 1; i >= 0; i--) {
       updatedString = updatedString.substr(0, locationUpdates[i].start.index) +
-          (locationUpdates[i].newString || '') + 
+          (locationUpdates[i].newString || '') +
           updatedString.substr(locationUpdates[i].end.index);
     }
     return updatedString;
@@ -269,7 +269,7 @@ class StringReplaceSourceMap {
 
         if (mappingRecord) {
           let columnOffset = 0;
-          if (mappingRecord.generated.line === columnOffsets.line) { 
+          if (mappingRecord.generated.line === columnOffsets.line) {
             columnOffset = columnOffsets.offsets.reduce((calculatedOffset, offsetInfo) => {
               if (offsetInfo.resetColumn) {
                 return offsetInfo.offset;
@@ -305,7 +305,7 @@ class StringReplaceSourceMap {
 
   /**
    * Helper method to generate an identity source map for a JS file
-   * 
+   *
    * @param {string} sourcePath of the file
    * @param {string} jsSource
    * @return {!Object}
@@ -317,7 +317,7 @@ class StringReplaceSourceMap {
       locations: true,
       ecmaVersion: 'latest'
     });
-  
+
     for (let token = tokenizer.getToken(); token.type.label !== 'eof'; token = tokenizer.getToken()) {
       const mapping = {
         original: token.loc.start,
@@ -333,5 +333,3 @@ class StringReplaceSourceMap {
     return generator.toJSON();
   }
 }
-
-module.exports = StringReplaceSourceMap;
diff --git a/package.json b/package.json
index c7c0a29..f9a94af 100644
--- a/package.json
+++ b/package.json
@@ -1,8 +1,9 @@
 {
   "name": "string-replace-source-map",
-  "version": "1.3.1",
+  "version": "2.0.0",
   "description": "Replace strings in a file with a source map and update the mappings at the same time.",
   "main": "index.js",
+  "type": "module",
   "repository": "https://github.com/Banno/string-replace-source-map",
   "author": "Chad Killingsworth <ckillingsworth@jackhenry.com>",
   "license": "Apache-2.0",
@@ -15,9 +16,10 @@
   ],
   "dependencies": {
     "acorn": "8.x",
-    "source-map": "0.8.0-beta.0 || 0.8.x"
+    "source-map": "^0.7.6"
   },
   "devDependencies": {
-    "jasmine": "^3.5.0"
-  }
+    "jasmine": "^6.2.0"
+  },
+  "packageManager": "yarn@4.16.0"
 }
diff --git a/test/string-replace-source-map.spec.js b/test/string-replace-source-map.spec.js
index b18aaf7..c4b0b73 100644
--- a/test/string-replace-source-map.spec.js
+++ b/test/string-replace-source-map.spec.js
@@ -1,6 +1,11 @@
-const fs = require('fs');
-const path = require('path');
-const sourceMap = require('source-map');
+import * as fs from 'node:fs';
+import path from 'node:path';
+import {fileURLToPath, URL} from 'node:url';
+import sourceMap from 'source-map';
+import StringReplaceSourceMap from '../index.js';
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
+
 
 function verifySourceMap(originalContents, newContents, generatedSourceMap, replacementIndex) {
   const originalLines = originalContents.split('\n');
@@ -30,7 +35,6 @@ function verifySourceMap(originalContents, newContents, generatedSourceMap, repl
 }
 
 describe('string-replace-source-map', () => {
-  const StringReplaceSourceMap = require('../');
   const originalFile = fs.readFileSync(path.resolve(__dirname, 'fixtures/original-file.js'), 'utf8');
   const originalSourceMap = fs.readFileSync(path.resolve(__dirname, 'fixtures/original-file.js.map'), 'utf8');
   /** @type {!StringReplaceSourceMap} */
diff --git a/yarn.lock b/yarn.lock
index ee68577..822363a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1,131 +1,119 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
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-  version "8.7.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-8.7.1.tgz#0197122c843d1bf6d0a5e83220a788f278f63c30"
-  integrity sha512-Xx54uLJQZ19lKygFXOWsscKUbsBZW0CPykPhVQdhIeIwrbPmJzqeASDInc8nKBnp/JT6igTs82qPXz069H8I/A==
-
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-  integrity sha1-ibTRmasr7kneFk6gK4nORi1xt2c=
-
-brace-expansion@^1.1.7:
-  version "1.1.11"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.11.tgz#3c7fcbf529d87226f3d2f52b966ff5271eb441dd"
-  integrity sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
-concat-map@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
-  integrity sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=
-
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-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
-  integrity sha1-FQStJSMVjKpA20onh8sBQRmU6k8=
-
-glob@^7.1.4:
-  version "7.1.6"
-  resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.6.tgz#141f33b81a7c2492e125594307480c46679278a6"
-  integrity sha512-LwaxwyZ72Lk7vZINtNNrywX0ZuLyStrdDtabefZKAY5ZGJhVtgdznluResxNmPitE0SAO+O26sWTHeKSI2wMBA==
-  dependencies:
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-    inflight "^1.0.4"
-    inherits "2"
-    minimatch "^3.0.4"
-    once "^1.3.0"
-    path-is-absolute "^1.0.0"
-
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-  resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
-  integrity sha1-Sb1jMdfQLQwJvJEKEHW6gWW1bfk=
-  dependencies:
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-    wrappy "1"
-
-inherits@2:
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-  resolved "https://registry.yarnpkg.com/inherits/-/inherits-2.0.4.tgz#0fa2c64f932917c3433a0ded55363aae37416b7c"
-  integrity sha512-k/vGaX4/Yla3WzyMCvTQOXYeIHvqOKtnqBduzTHpzpQZzAskKMhZ2K+EnBiSM9zGSoIFeMpXKxa4dYeZIQqewQ==
-
-jasmine-core@~3.5.0:
-  version "3.5.0"
-  resolved "https://registry.yarnpkg.com/jasmine-core/-/jasmine-core-3.5.0.tgz#132c23e645af96d85c8bca13c8758b18429fc1e4"
-  integrity sha512-nCeAiw37MIMA9w9IXso7bRaLl+c/ef3wnxsoSAlYrzS+Ot0zTG6nU8G/cIfGkqpkjX2wNaIW9RFG0TwIFnG6bA==
-
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-  resolved "https://registry.yarnpkg.com/jasmine/-/jasmine-3.5.0.tgz#7101eabfd043a1fc82ac24e0ab6ec56081357f9e"
-  integrity sha512-DYypSryORqzsGoMazemIHUfMkXM7I7easFaxAvNM3Mr6Xz3Fy36TupTrAOxZWN8MVKEU5xECv22J4tUQf3uBzQ==
+# This file is generated by running "yarn install" inside your project.
+# Manual changes might be lost - proceed with caution!
+
+__metadata:
+  version: 10
+  cacheKey: 10c0
+
+"@jasminejs/reporters@npm:^1.0.0":
+  version: 1.0.0
+  resolution: "@jasminejs/reporters@npm:1.0.0"
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+  languageName: node
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+"acorn@npm:8.x":
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+  bin:
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+"balanced-match@npm:^4.0.2":
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+"brace-expansion@npm:^5.0.5":
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   dependencies:
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-    jasmine-core "~3.5.0"
-
-lodash.sortby@^4.7.0:
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+    balanced-match: "npm:^4.0.2"
+  checksum: 10c0/8c919869b90f61d533b341d3340be5ee4413232ea89b8246cbc2f38eb014f1d8182785c98a006eaf6111d02dc9eeffefdc240d5ac158625b2ed084dccd4bbf9b
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+"glob@npm:^10.2.2 || ^11.0.3 || ^12.0.0 || ^13.0.0":
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+  resolution: "glob@npm:13.0.6"
   dependencies:
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-
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-  version "1.4.0"
-  resolved "https://registry.yarnpkg.com/once/-/once-1.4.0.tgz#583b1aa775961d4b113ac17d9c50baef9dd76bd1"
-  integrity sha1-WDsap3WWHUsROsF9nFC6753Xa9E=
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+    minipass: "npm:^7.1.3"
+    path-scurry: "npm:^2.0.2"
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+"jasmine@npm:^6.2.0":
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   dependencies:
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-
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-
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-  resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.8.0-beta.0.tgz#d4c1bb42c3f7ee925f005927ba10709e0d1d1f11"
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+    "@jasminejs/reporters": "npm:^1.0.0"
+    glob: "npm:^10.2.2 || ^11.0.3 || ^12.0.0 || ^13.0.0"
+    jasmine-core: "npm:~6.2.0"
+  bin:
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+  checksum: 10c0/11ce21efc28bdc76958a18c30d96ffbd84dc4e5d0d8c5f7f2ed23606b27f83f0a37e68b530808138b0adff5d2daee2d904ef35a5a2f9190b6974810a98b89339
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+"minimatch@npm:^10.2.2":
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   dependencies:
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-
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-  integrity sha1-qLE/1r/SSJUZZ0zN5VujaTtwbQk=
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   dependencies:
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-
-webidl-conversions@^4.0.2:
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+    lru-cache: "npm:^11.0.0"
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+  resolution: "string-replace-source-map@workspace:."
   dependencies:
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-    tr46 "^1.0.1"
-    webidl-conversions "^4.0.2"
-
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-  integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
+    acorn: "npm:8.x"
+    jasmine: "npm:^6.2.0"
+    source-map: "npm:^0.7.6"
+  languageName: unknown
+  linkType: soft