diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 071978a776c7..ef450b50bf40 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -417,7 +417,7 @@ jobs:
     if: needs.job_get_metadata.outputs.changed_any_code == 'true'
     strategy:
       matrix:
-        node: [ '18.12.1' ]
+        node: [ '18.12.1', '20.11.1' ]
     name: Unit tests (Node ${{ matrix.node }})
     steps:
       - uses: actions/checkout@v4
@@ -455,7 +455,7 @@ jobs:
     if: needs.job_get_metadata.outputs.changed_core == 'true'
     strategy:
       matrix:
-        node: [ '18.12.1' ]
+        node: [ '18.12.1', '20.11.1' ]
         env:
           - DB: mysql8
             NODE_ENV: testing-mysql
diff --git a/ghost/admin/package.json b/ghost/admin/package.json
index a42fa0d49b82..7c66f4e95eed 100644
--- a/ghost/admin/package.json
+++ b/ghost/admin/package.json
@@ -26,7 +26,7 @@
     "lint": "yarn lint:js && yarn lint:hbs"
   },
   "engines": {
-    "node": "^18.12.1"
+    "node": "^18.12.1 || ^20.11.1"
   },
   "devDependencies": {
     "@babel/eslint-parser": "7.23.3",
diff --git a/ghost/core/package.json b/ghost/core/package.json
index 73b5de5ddf38..9bf4a2a742c7 100644
--- a/ghost/core/package.json
+++ b/ghost/core/package.json
@@ -53,8 +53,8 @@
     "prepack": "node monobundle.js"
   },
   "engines": {
-    "node": "^18.12.1",
-    "cli": "^1.25.0"
+    "node": "^18.12.1 || ^20.11.1",
+    "cli": "^1.26.0"
   },
   "dependencies": {
     "@extractus/oembed-extractor": "3.2.1",
diff --git a/ghost/core/test/unit/server/services/custom-redirects/api.test.js b/ghost/core/test/unit/server/services/custom-redirects/api.test.js
index 66754f3c82fb..d7836996cf5e 100644
--- a/ghost/core/test/unit/server/services/custom-redirects/api.test.js
+++ b/ghost/core/test/unit/server/services/custom-redirects/api.test.js
@@ -95,15 +95,29 @@ describe('UNIT: redirects CustomRedirectsAPI class', function () {
 
     describe('setFromFilePath', function () {
         it('throws a syntax error when setting invalid JSON redirects file', async function () {
+            const invalidJSON = '{invalid json';
             const invalidFilePath = path.join(__dirname, '/invalid/redirects/path.json');
-            fs.readFile.withArgs(invalidFilePath, 'utf-8').resolves('{invalid json');
+            fs.readFile.withArgs(invalidFilePath, 'utf-8').resolves(invalidJSON);
+
+            let expectedErrorMessage;
+
+            try {
+                JSON.parse(invalidJSON);
+            } catch (err) {
+                expectedErrorMessage = err.message;
+            }
+
+            if (!expectedErrorMessage) {
+                // This should never happen because the JSON is invalid
+                should.fail('expectedErrorMessage is not set');
+            }
 
             try {
                 await customRedirectsAPI.setFromFilePath(invalidFilePath, '.json');
                 should.fail('setFromFilePath did not throw');
             } catch (err) {
                 should.exist(err);
-                err.message.should.eql('Could not parse JSON: Unexpected token i in JSON at position 1.');
+                err.message.should.eql(`Could not parse JSON: ${expectedErrorMessage}.`);
             }
         });