diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index 3a48e4f..8d398ca 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -42,7 +42,7 @@ jobs:
     name: Test
     strategy:
       matrix:
-        go-version: [ 1.16.x, 1.17.x, 1.18.x ]
+        go-version: [ 1.18.x, 1.19.x ]
         platform: [ ubuntu-latest, macos-latest, windows-latest ]
     runs-on: ${{ matrix.platform }}
     steps:
diff --git a/README.md b/README.md
index 1e63817..dd19c2e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ It is the successor of the [Macaron](https://github.com/go-macaron/macaron), and
 
 ## Installation
 
-The minimum requirement of Go is **1.16**.
+The minimum requirement of Go is **1.18**.
 
 	go get github.com/flamego/flamego
 
diff --git a/go.mod b/go.mod
index addd18e..fb18883 100644
--- a/go.mod
+++ b/go.mod
@@ -1,10 +1,19 @@
 module github.com/flamego/flamego
 
-go 1.16
+go 1.18
 
 require (
-	github.com/alecthomas/participle/v2 v2.0.0-alpha10
+	github.com/alecthomas/participle/v2 v2.0.0-beta.5
 	github.com/fatih/color v1.13.0
 	github.com/pkg/errors v0.9.1
 	github.com/stretchr/testify v1.8.0
 )
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/mattn/go-colorable v0.1.9 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+)
diff --git a/go.sum b/go.sum
index 31f8720..5dd8b67 100644
--- a/go.sum
+++ b/go.sum
@@ -1,16 +1,13 @@
 github.com/alecthomas/assert/v2 v2.0.3 h1:WKqJODfOiQG0nEJKFKzDIG3E29CN2/4zR9XGJzKIkbg=
-github.com/alecthomas/assert/v2 v2.0.3/go.mod h1:b/+1DI2Q6NckYi+3mXyH3wFb8qG37K/DuK80n7WefXA=
-github.com/alecthomas/participle/v2 v2.0.0-alpha10 h1:uv/xz/d4SZAiZ22umWu31JT384k7nsyOpi9eiVBVfxA=
-github.com/alecthomas/participle/v2 v2.0.0-alpha10/go.mod h1:RC764t6n4L8D8ITAJv0qdokritYSNR3wV5cVwmIEaMM=
+github.com/alecthomas/participle/v2 v2.0.0-beta.5 h1:y6dsSYVb1G5eK6mgmy+BgI3Mw35a3WghArZ/Hbebrjo=
+github.com/alecthomas/participle/v2 v2.0.0-beta.5/go.mod h1:RC764t6n4L8D8ITAJv0qdokritYSNR3wV5cVwmIEaMM=
 github.com/alecthomas/repr v0.1.0 h1:ENn2e1+J3k09gyj2shc0dHr/yjaWSHRlrJ4DPMevDqE=
-github.com/alecthomas/repr v0.1.0/go.mod h1:2kn6fqh/zIyPLmm3ugklbEi5hg5wS435eygvNfaDQL8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.13.0 h1:8LOYc1KYPPmyKMuN8QV2DNRWNbLo6LZ0iLs8+mlH53w=
 github.com/fatih/color v1.13.0/go.mod h1:kLAiJbzzSOZDVNGyDpeOxJ47H46qBXwg5ILebYFFOfk=
 github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
-github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
 github.com/mattn/go-colorable v0.1.9 h1:sqDoxXbdeALODt0DAeJCVp38ps9ZogZEAXjus69YV3U=
 github.com/mattn/go-colorable v0.1.9/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
diff --git a/internal/route/parser.go b/internal/route/parser.go
index 06cdc71..2f66a09 100644
--- a/internal/route/parser.go
+++ b/internal/route/parser.go
@@ -12,13 +12,12 @@ import (
 
 // Parser is a BNF-based route syntax parser using stateful lexer.
 type Parser struct {
-	parser *participle.Parser
+	parser *participle.Parser[Route]
 }
 
 // Parse parses and returns a single route.
 func (p *Parser) Parse(s string) (*Route, error) {
-	ast := &Route{}
-	return ast, p.parser.ParseString("", s, ast)
+	return p.parser.ParseString("", s)
 }
 
 // NewParser creates and returns a new Parser.
@@ -62,8 +61,7 @@ func NewParser() (*Parser, error) {
 		return nil, errors.Wrap(err, "new lexer")
 	}
 
-	parser, err := participle.Build(
-		&Route{},
+	parser, err := participle.Build[Route](
 		participle.Lexer(l),
 		participle.UseLookahead(2),
 	)