diff --git a/go.mod b/go.mod
index fd23d14..687cc2c 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/kitagry/regols
 
-go 1.19
+go 1.22
 
 require (
 	github.com/google/go-cmp v0.6.0
diff --git a/langserver/completion.go b/langserver/completion.go
index 1d2cc8b..f46aa1f 100644
--- a/langserver/completion.go
+++ b/langserver/completion.go
@@ -11,7 +11,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentCompletion(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentCompletion(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
diff --git a/langserver/definition.go b/langserver/definition.go
index 988c2fd..ddca5e0 100644
--- a/langserver/definition.go
+++ b/langserver/definition.go
@@ -10,7 +10,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentDefinition(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentDefinition(ctx context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -23,7 +23,7 @@ func (h *handler) handleTextDocumentDefinition(ctx context.Context, conn *jsonrp
 	return h.lookupIdent(ctx, params.TextDocument.URI, params.Position)
 }
 
-func (h *handler) lookupIdent(ctx context.Context, uri lsp.DocumentURI, position lsp.Position) ([]lsp.Location, error) {
+func (h *handler) lookupIdent(_ context.Context, uri lsp.DocumentURI, position lsp.Position) ([]lsp.Location, error) {
 	loc := h.toOPALocation(position, uri)
 	lookupResults, err := h.project.LookupDefinition(loc)
 	if err != nil {
diff --git a/langserver/diagnostic.go b/langserver/diagnostic.go
index c94c576..be84b6d 100644
--- a/langserver/diagnostic.go
+++ b/langserver/diagnostic.go
@@ -10,12 +10,7 @@ import (
 func (h *handler) diagnostic() {
 	running := make(map[lsp.DocumentURI]context.CancelFunc)
 
-	for {
-		uri, ok := <-h.diagnosticRequest
-		if !ok {
-			break
-		}
-
+	for uri := range h.diagnosticRequest {
 		cancel, ok := running[uri]
 		if ok {
 			cancel()
@@ -25,7 +20,7 @@ func (h *handler) diagnostic() {
 		running[uri] = cancel
 
 		go func() {
-			diagnostics, err := h.diagnose(ctx, uri)
+			diagnostics, err := h.diagnose(uri)
 			if err != nil {
 				h.logger.Println(err)
 				return
@@ -41,7 +36,7 @@ func (h *handler) diagnostic() {
 	}
 }
 
-func (h *handler) diagnose(ctx context.Context, uri lsp.DocumentURI) (map[lsp.DocumentURI][]lsp.Diagnostic, error) {
+func (h *handler) diagnose(uri lsp.DocumentURI) (map[lsp.DocumentURI][]lsp.Diagnostic, error) {
 	result := make(map[lsp.DocumentURI][]lsp.Diagnostic)
 
 	pathToErrs := h.project.GetErrors(documentURIToURI(uri))
diff --git a/langserver/format.go b/langserver/format.go
index c1fb1bb..332444b 100644
--- a/langserver/format.go
+++ b/langserver/format.go
@@ -11,7 +11,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentFormatting(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentFormatting(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
diff --git a/langserver/hover.go b/langserver/hover.go
index 2aea136..7fee95a 100644
--- a/langserver/hover.go
+++ b/langserver/hover.go
@@ -8,7 +8,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentHover(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentHover(ctx context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -21,7 +21,7 @@ func (h *handler) handleTextDocumentHover(ctx context.Context, conn *jsonrpc2.Co
 	return h.documentIdent(ctx, params.TextDocument.URI, params.Position)
 }
 
-func (h *handler) documentIdent(ctx context.Context, uri lsp.DocumentURI, position lsp.Position) (lsp.Hover, error) {
+func (h *handler) documentIdent(_ context.Context, uri lsp.DocumentURI, position lsp.Position) (lsp.Hover, error) {
 	loc := h.toOPALocation(position, uri)
 	documentResults, err := h.project.TermDocument(loc)
 	if err != nil {
diff --git a/langserver/initialize.go b/langserver/initialize.go
index 8cfc60d..43701b3 100644
--- a/langserver/initialize.go
+++ b/langserver/initialize.go
@@ -9,7 +9,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleInitialize(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleInitialize(_ context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -31,7 +31,7 @@ func (h *handler) handleInitialize(ctx context.Context, conn *jsonrpc2.Conn, req
 	return lsp.InitializeResult{
 		Capabilities: lsp.ServerCapabilities{
 			TextDocumentSync: &lsp.TextDocumentSyncOptionsOrKind{
-				Kind: tdskToPTr(lsp.TDSKFull),
+				Kind: toPtr(lsp.TDSKFull),
 			},
 			DocumentFormattingProvider: true,
 			DefinitionProvider:         true,
@@ -45,6 +45,6 @@ func (h *handler) handleInitialize(ctx context.Context, conn *jsonrpc2.Conn, req
 	}, nil
 }
 
-func tdskToPTr(s lsp.TextDocumentSyncKind) *lsp.TextDocumentSyncKind {
-	return &s
+func toPtr[T any](t T) *T {
+	return &t
 }
diff --git a/langserver/internal/lsp/service.go b/langserver/internal/lsp/service.go
index 4709029..c57ff82 100644
--- a/langserver/internal/lsp/service.go
+++ b/langserver/internal/lsp/service.go
@@ -24,7 +24,7 @@ type InitializeParams struct {
 	RootURI               DocumentURI        `json:"rootUri,omitempty"`
 	ClientInfo            ClientInfo         `json:"clientInfo,omitempty"`
 	Trace                 Trace              `json:"trace,omitempty"`
-	InitializationOptions interface{}        `json:"initializationOptions,omitempty"`
+	InitializationOptions any                `json:"initializationOptions,omitempty"`
 	Capabilities          ClientCapabilities `json:"capabilities"`
 
 	WorkDoneToken string `json:"workDoneToken,omitempty"`
@@ -54,7 +54,7 @@ type ClientCapabilities struct {
 	Workspace    WorkspaceClientCapabilities    `json:"workspace,omitempty"`
 	TextDocument TextDocumentClientCapabilities `json:"textDocument,omitempty"`
 	Window       WindowClientCapabilities       `json:"window,omitempty"`
-	Experimental interface{}                    `json:"experimental,omitempty"`
+	Experimental any                            `json:"experimental,omitempty"`
 
 	// Below are Sourcegraph extensions. They do not live in lspext since
 	// they are extending the field InitializeParams.Capabilities
@@ -196,7 +196,7 @@ type TextDocumentClientCapabilities struct {
 	FoldingRange *struct {
 		DynamicRegistration bool `json:"dynamicRegistration,omitempty"`
 
-		RangeLimit interface{} `json:"rangeLimit,omitempty"`
+		RangeLimit any `json:"rangeLimit,omitempty"`
 
 		LineFoldingOnly bool `json:"lineFoldingOnly,omitempty"`
 	} `json:"foldingRange,omitempty"`
@@ -334,7 +334,7 @@ type ServerCapabilities struct {
 	// is a Sourcegraph extension.
 	XWorkspaceSymbolByProperties bool `json:"xworkspaceSymbolByProperties,omitempty"`
 
-	Experimental interface{} `json:"experimental,omitempty"`
+	Experimental any `json:"experimental,omitempty"`
 }
 
 type CompletionOptions struct {
@@ -360,8 +360,8 @@ type ExecuteCommandOptions struct {
 }
 
 type ExecuteCommandParams struct {
-	Command   string        `json:"command"`
-	Arguments []interface{} `json:"arguments,omitempty"`
+	Command   string `json:"command"`
+	Arguments []any  `json:"arguments,omitempty"`
 }
 
 type SemanticHighlightingOptions struct {
@@ -442,7 +442,7 @@ type CompletionItem struct {
 	InsertTextFormat    InsertTextFormat   `json:"insertTextFormat,omitempty"`
 	TextEdit            *TextEdit          `json:"textEdit,omitempty"`
 	AdditionalTextEdits []TextEdit         `json:"additionalTextEdits,omitempty"`
-	Data                interface{}        `json:"data,omitempty"`
+	Data                any                `json:"data,omitempty"`
 }
 
 type CompletionList struct {
@@ -480,7 +480,7 @@ type InsertTextFormat int
 
 const (
 	ITFPlainText InsertTextFormat = 1
-	ITFSnippet                    = 2
+	ITFSnippet   InsertTextFormat = 2
 )
 
 type CompletionContext struct {
@@ -680,7 +680,7 @@ type ConfigurationItem struct {
 	Section  string `json:"section,omitempty"`
 }
 
-type ConfigurationResult []interface{}
+type ConfigurationResult []any
 
 type CodeActionContext struct {
 	Diagnostics []Diagnostic `json:"diagnostics"`
@@ -697,9 +697,9 @@ type CodeLensParams struct {
 }
 
 type CodeLens struct {
-	Range   Range       `json:"range"`
-	Command Command     `json:"command,omitempty"`
-	Data    interface{} `json:"data,omitempty"`
+	Range   Range   `json:"range"`
+	Command Command `json:"command,omitempty"`
+	Data    any     `json:"data,omitempty"`
 }
 
 type DocumentFormattingParams struct {
@@ -772,7 +772,7 @@ type LogMessageParams struct {
 }
 
 type DidChangeConfigurationParams struct {
-	Settings interface{} `json:"settings"`
+	Settings any `json:"settings"`
 }
 
 type FileChangeType int
diff --git a/langserver/internal/lsp/structure.go b/langserver/internal/lsp/structure.go
index fa82feb..1f7a33f 100644
--- a/langserver/internal/lsp/structure.go
+++ b/langserver/internal/lsp/structure.go
@@ -95,7 +95,7 @@ type Command struct {
 	 * Arguments that the command handler should be
 	 * invoked with.
 	 */
-	Arguments []interface{} `json:"arguments"`
+	Arguments []any `json:"arguments"`
 }
 
 type TextEdit struct {
diff --git a/langserver/langserver.go b/langserver/langserver.go
index 9734dae..c488877 100644
--- a/langserver/langserver.go
+++ b/langserver/langserver.go
@@ -30,7 +30,7 @@ func NewHandler() jsonrpc2.Handler {
 	return jsonrpc2.HandlerWithError(handler.handle)
 }
 
-func (h *handler) handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handle(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	switch req.Method {
 	case "initialize":
 		return h.handleInitialize(ctx, conn, req)
diff --git a/langserver/reference.go b/langserver/reference.go
index b8286ed..754b70c 100644
--- a/langserver/reference.go
+++ b/langserver/reference.go
@@ -8,7 +8,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentReferences(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentReferences(ctx context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -21,7 +21,7 @@ func (h *handler) handleTextDocumentReferences(ctx context.Context, conn *jsonrp
 	return h.lookupReferences(ctx, params.TextDocument.URI, params.Position)
 }
 
-func (h *handler) lookupReferences(ctx context.Context, uri lsp.DocumentURI, position lsp.Position) ([]lsp.Location, error) {
+func (h *handler) lookupReferences(_ context.Context, uri lsp.DocumentURI, position lsp.Position) ([]lsp.Location, error) {
 	loc := h.toOPALocation(position, uri)
 	locations, err := h.project.LookupReferences(loc)
 	if err != nil {
diff --git a/langserver/text_document.go b/langserver/text_document.go
index db00130..4555fdf 100644
--- a/langserver/text_document.go
+++ b/langserver/text_document.go
@@ -8,7 +8,7 @@ import (
 	"github.com/sourcegraph/jsonrpc2"
 )
 
-func (h *handler) handleTextDocumentDidOpen(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentDidOpen(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -23,7 +23,7 @@ func (h *handler) handleTextDocumentDidOpen(ctx context.Context, conn *jsonrpc2.
 	return nil, nil
 }
 
-func (h *handler) handleTextDocumentDidChange(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentDidChange(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -38,7 +38,7 @@ func (h *handler) handleTextDocumentDidChange(ctx context.Context, conn *jsonrpc
 	return nil, nil
 }
 
-func (h *handler) handleTextDocumentDidClose(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentDidClose(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}
@@ -53,7 +53,7 @@ func (h *handler) handleTextDocumentDidClose(ctx context.Context, conn *jsonrpc2
 	return nil, nil
 }
 
-func (h *handler) handleTextDocumentDidSave(ctx context.Context, conn *jsonrpc2.Conn, req *jsonrpc2.Request) (result interface{}, err error) {
+func (h *handler) handleTextDocumentDidSave(_ context.Context, _ *jsonrpc2.Conn, req *jsonrpc2.Request) (result any, err error) {
 	if req.Params == nil {
 		return nil, &jsonrpc2.Error{Code: jsonrpc2.CodeInvalidParams}
 	}