diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2a6d6e414..cd6d33178 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -22,10 +22,10 @@ jobs:
           fetch-depth: 0
           token: ${{ secrets.SEEK_OSS_CI_GITHUB_TOKEN }}
 
-      - name: Set up Node.js 18.x
+      - name: Set up Node.js 20.x
         uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - name: Install dependencies
         run: yarn install --frozen-lockfile
diff --git a/.github/workflows/snapshot.yml b/.github/workflows/snapshot.yml
index faf4c48e8..9dad17840 100644
--- a/.github/workflows/snapshot.yml
+++ b/.github/workflows/snapshot.yml
@@ -17,10 +17,10 @@ jobs:
           fetch-depth: 0
           token: ${{ secrets.SEEK_OSS_CI_GITHUB_TOKEN }}
 
-      - name: Set up Node.js 18.x
+      - name: Set up Node.js 20.x
         uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - name: Install dependencies
         run: yarn install --frozen-lockfile
diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index bf136983e..3b4d54c7e 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -44,10 +44,10 @@ jobs:
           git config user.name seek-oss-ci
           git config user.email 34733141+seek-oss-ci@users.noreply.github.com
 
-      - name: Set up Node.js 18.x
+      - name: Set up Node.js 20.x
         uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - name: Install dependencies
         run: yarn install --frozen-lockfile
@@ -85,10 +85,10 @@ jobs:
       - name: Check out repo
         uses: actions/checkout@v4
 
-      - name: Set up Node.js 18.x
+      - name: Set up Node.js 20.x
         uses: actions/setup-node@v4
         with:
-          node-version: 18.x
+          node-version: 20.x
 
       - if: github.head_ref != 'beta' && github.head_ref != 'changeset-release/master' && github.ref_name != 'beta' && github.ref_name != 'changeset-release/master'
         name: Test template
diff --git a/.nvmrc b/.nvmrc
index 3c032078a..209e3ef4b 100644
--- a/.nvmrc
+++ b/.nvmrc
@@ -1 +1 @@
-18
+20
diff --git a/src/cli/format.int.test.ts b/src/cli/format.int.test.ts
index c49ee83d5..1a7da9911 100644
--- a/src/cli/format.int.test.ts
+++ b/src/cli/format.int.test.ts
@@ -100,6 +100,8 @@ beforeEach(() => {
 });
 
 afterAll(() => {
+  process.exitCode = undefined;
+
   // Restore the original working directory to avoid confusion in other tests.
   process.chdir(originalCwd);
 
diff --git a/src/cli/lint.int.test.ts b/src/cli/lint.int.test.ts
index c6ba9f39b..95b364200 100644
--- a/src/cli/lint.int.test.ts
+++ b/src/cli/lint.int.test.ts
@@ -84,6 +84,8 @@ beforeEach(() => {
 });
 
 afterAll(() => {
+  process.exitCode = undefined;
+
   // Restore the original working directory to avoid confusion in other tests.
   process.chdir(originalCwd);
 
diff --git a/src/wrapper/main.test.ts b/src/wrapper/main.test.ts
index 2fe4ebb51..0ac843551 100644
--- a/src/wrapper/main.test.ts
+++ b/src/wrapper/main.test.ts
@@ -172,7 +172,7 @@ test('syncFunctionHandler', async () => {
           { stack: expect.any(String) },
           `
           {
-            "message": "Unexpected token I in JSON at position 0",
+            "message": "Unexpected token 'I', "Invalid JSON" is not valid JSON",
             "name": "SyntaxError",
             "stack": Any<String>,
           }
diff --git a/template/lambda-sqs-worker/src/framework/validation.test.ts b/template/lambda-sqs-worker/src/framework/validation.test.ts
index 5df6ee1e7..4b9c7bf74 100644
--- a/template/lambda-sqs-worker/src/framework/validation.test.ts
+++ b/template/lambda-sqs-worker/src/framework/validation.test.ts
@@ -78,7 +78,7 @@ describe('validateJson', () => {
     expect(() =>
       validateJson(input, IdDescriptionSchema),
     ).toThrowErrorMatchingInlineSnapshot(
-      `"Unexpected token } in JSON at position 0"`,
+      `"Unexpected token '}', "}" is not valid JSON"`,
     );
   });
 });