diff --git a/document_diagnostic.go b/document_diagnostic.go
index cecd39f..5f3a1f7 100644
--- a/document_diagnostic.go
+++ b/document_diagnostic.go
@@ -6,8 +6,7 @@ import (
 )
 
 const (
-	MethodTextDocumentDiagnostic         = "textDocument/diagnostic"
-	MethodTextDocumentPublishDiagnostics = "textDocument/publishDiagnostics"
+	MethodTextDocumentDiagnostic = "textDocument/diagnostic"
 )
 
 // DocumentDiagnosticParams - Parameters of the document diagnostic request.
@@ -30,24 +29,6 @@ type DocumentDiagnosticParams struct {
 	PreviousResultID string `json:"previousResultId,omitempty"`
 }
 
-// PublishDiagnosticsParams - The parameters of a publish diagnostics notification.
-//
-// @since 3.0.0
-//
-// See https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#publishDiagnosticsParams
-type PublishDiagnosticsParams struct {
-	// The URI for which diagnostic information is reported.
-	URI DocumentURI `json:"uri"`
-
-	// Optional the version number of the document the diagnostics are published for.
-	//
-	// @since 3.15.0
-	Version int `json:"version,omitempty"`
-
-	// An array of diagnostic information items.
-	Diagnostics []Diagnostic `json:"diagnostics"`
-}
-
 // DocumentDiagnosticReport is either a full or an unchanged diagnostic report.
 //
 // @since 3.17.0
diff --git a/document_diagnostic_test.go b/document_diagnostic_test.go
index 1e2c140..e6fb2b5 100644
--- a/document_diagnostic_test.go
+++ b/document_diagnostic_test.go
@@ -24,26 +24,3 @@ func Test_DocumentDiagnostic_StructsUnmarshalValidJSON(t *testing.T) {
 		t.Fatalf("unexpected DocumentDiagnosticReport: %+v", report)
 	}
 }
-
-func Test_PublishDiagnosticsParams_UnmarshalValidJSON(t *testing.T) {
-	var params protocol.PublishDiagnosticsParams
-	if err := json.Unmarshal([]byte(`{
-		"uri":"file:///tmp/main.go",
-		"version":2,
-		"diagnostics":[{"range":{"start":{"line":1,"character":1},"end":{"line":1,"character":3}},"message":"example diagnostic"}]
-	}`), &params); err != nil {
-		t.Fatalf("unmarshal PublishDiagnosticsParams failed: %v", err)
-	}
-
-	if params.URI != "file:///tmp/main.go" {
-		t.Fatalf("unexpected URI: %q", params.URI)
-	}
-
-	if params.Version != 2 {
-		t.Fatalf("unexpected Version: %d", params.Version)
-	}
-
-	if len(params.Diagnostics) != 1 || params.Diagnostics[0].Message != "example diagnostic" {
-		t.Fatalf("unexpected Diagnostics: %+v", params.Diagnostics)
-	}
-}