diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 91907760..a6e32261 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -69,6 +69,9 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node }}
+    - name: Install @typescript-eslint/parser@3
+      run: npm install -D @typescript-eslint/parser@3
+      if: matrix.node == '8.10.0'
     - name: Install Packages
       run: npm install
     - name: Install ESLint v${{ matrix.eslint }}
diff --git a/package.json b/package.json
index 76e90d26..a5dbd835 100644
--- a/package.json
+++ b/package.json
@@ -42,7 +42,7 @@
     "npm-run-all": "^4.1.5",
     "nyc": "^14.0.0",
     "opener": "^1.5.1",
-    "prettier": "^2.2.1",
+    "prettier": "^2.3.1",
     "rimraf": "^2.6.3",
     "rollup": "^1.1.2",
     "rollup-plugin-node-resolve": "^4.0.0",
diff --git a/src/parser-services.ts b/src/parser-services.ts
index 0e086d85..d2af06b0 100644
--- a/src/parser-services.ts
+++ b/src/parser-services.ts
@@ -32,9 +32,7 @@ import { isSFCFile } from "./common/parser-options"
 // Helpers
 //------------------------------------------------------------------------------
 
-type CustomBlockVisitorFactory = (
-    context: CustomBlockContext,
-) =>
+type CustomBlockVisitorFactory = (context: CustomBlockContext) =>
     | {
           [key: string]: (...args: any) => void
       }
@@ -229,9 +227,10 @@ export function define(
                         for (const customBlock of customBlocks) {
                             const lang = getLang(customBlock)
 
-                            const activeVisitorFactories = visitorFactories.filter(
-                                (f) => f.test(lang, customBlock),
-                            )
+                            const activeVisitorFactories =
+                                visitorFactories.filter((f) =>
+                                    f.test(lang, customBlock),
+                                )
                             if (!activeVisitorFactories.length) {
                                 continue
                             }
diff --git a/src/script/index.ts b/src/script/index.ts
index af250027..c1ce613b 100644
--- a/src/script/index.ts
+++ b/src/script/index.ts
@@ -54,16 +54,15 @@ const DUMMY_PARENT: any = {}
 // Like Vue, it judges whether it is a function expression or not.
 // https://github.com/vuejs/vue/blob/0948d999f2fddf9f90991956493f976273c5da1f/src/compiler/codegen/events.js#L3
 const IS_FUNCTION_EXPRESSION = /^\s*([\w$_]+|\([^)]*?\))\s*=>|^function\s*\(/u
-const IS_SIMPLE_PATH = /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?'\]|\["[^"]*?"\]|\[\d+\]|\[[A-Za-z_$][\w$]*\])*$/u
+const IS_SIMPLE_PATH =
+    /^[A-Za-z_$][\w$]*(?:\.[A-Za-z_$][\w$]*|\['[^']*?'\]|\["[^"]*?"\]|\[\d+\]|\[[A-Za-z_$][\w$]*\])*$/u
 
 /**
  * Parse the alias and iterator of 'v-for' directive values.
  * @param code The code to parse.
  * @returns The parsed result.
  */
-function processVForAliasAndIterator(
-    code: string,
-): {
+function processVForAliasAndIterator(code: string): {
     aliases: string
     hasParens: boolean
     delimiter: string
@@ -555,9 +554,8 @@ export function parseScriptElement(
             ? text.range[0]
             : node.startTag.range[1]
     const code = text != null && text.type === "VText" ? text.value : ""
-    const locationCalculator = globalLocationCalculator.getSubCalculatorAfter(
-        offset,
-    )
+    const locationCalculator =
+        globalLocationCalculator.getSubCalculatorAfter(offset)
     const result = parseScriptFragment(code, locationCalculator, parserOptions)
 
     // Needs the tokens of start/end tags for `lines-around-*` rules to work
@@ -624,7 +622,8 @@ export function parseExpression(
     if (!retB.expression) {
         return retB
     }
-    const ret = (retB as unknown) as ExpressionParseResult<VFilterSequenceExpression>
+    const ret =
+        retB as unknown as ExpressionParseResult<VFilterSequenceExpression>
 
     ret.expression = {
         type: "VFilterSequenceExpression",
@@ -1012,8 +1011,9 @@ function parseVOnExpressionBody(
         ).ast
         const references = analyzeExternalReferences(ast, parserOptions)
         const outermostStatement = ast.body[0] as ESLintExpressionStatement
-        const functionDecl = (outermostStatement.expression as ESLintUnaryExpression)
-            .argument as ESLintFunctionExpression
+        const functionDecl = (
+            outermostStatement.expression as ESLintUnaryExpression
+        ).argument as ESLintFunctionExpression
         const block = functionDecl.body
         const body = block.body
         const firstStatement = first(body)
diff --git a/src/template/index.ts b/src/template/index.ts
index 19374d1a..183dcea8 100644
--- a/src/template/index.ts
+++ b/src/template/index.ts
@@ -768,9 +768,8 @@ export function processMustache(
 
     const document = getOwnerDocument(node)
     try {
-        const locationCalculator = globalLocationCalculator.getSubCalculatorAfter(
-            range[0],
-        )
+        const locationCalculator =
+            globalLocationCalculator.getSubCalculatorAfter(range[0])
         const ret = parseExpression(
             mustache.value,
             locationCalculator,
diff --git a/test/define-custom-blocks-visitor.js b/test/define-custom-blocks-visitor.js
index cbb88ce3..aef1ac4d 100644
--- a/test/define-custom-blocks-visitor.js
+++ b/test/define-custom-blocks-visitor.js
@@ -395,10 +395,11 @@ describe("parserServices.defineCustomBlocksVisitor tests", () => {
                     create(ctx) {
                         return {
                             Program(node) {
-                                const error = ctx.parserServices.parseCustomBlockElement(
-                                    jsonParser,
-                                    { jsonSyntax: "json" }
-                                ).error
+                                const error =
+                                    ctx.parserServices.parseCustomBlockElement(
+                                        jsonParser,
+                                        { jsonSyntax: "json" }
+                                    ).error
                                 ctx.report({
                                     node,
                                     message: JSON.stringify({