diff --git a/crates/squawk_ide/src/completion.rs b/crates/squawk_ide/src/completion.rs
index c50aecb1..ca591e1c 100644
--- a/crates/squawk_ide/src/completion.rs
+++ b/crates/squawk_ide/src/completion.rs
@@ -963,7 +963,7 @@ mod tests {
     fn completions(sql: &str) -> String {
         let (offset, sql) = fixture(sql);
         let db = Database::default();
-        let file = File::new(&db, sql, 0);
+        let file = File::new(&db, sql.into());
         let items = completion(&db, file, offset);
         assert!(
             !items.is_empty(),
@@ -975,7 +975,7 @@ mod tests {
     fn completions_not_found(sql: &str) {
         let (offset, sql) = fixture(sql);
         let db = Database::default();
-        let file = File::new(&db, sql, 0);
+        let file = File::new(&db, sql.into());
         let items = completion(&db, file, offset);
         assert_eq!(
             items,
diff --git a/crates/squawk_ide/src/db.rs b/crates/squawk_ide/src/db.rs
index a5fb8d0f..d3af2b01 100644
--- a/crates/squawk_ide/src/db.rs
+++ b/crates/squawk_ide/src/db.rs
@@ -2,6 +2,7 @@ use ::line_index::LineIndex;
 use salsa::Database as Db;
 use salsa::Storage;
 use squawk_syntax::{Parse, SourceFile};
+use std::sync::Arc;
 
 use crate::binder;
 use crate::binder::Binder;
@@ -9,8 +10,7 @@ use crate::binder::Binder;
 #[salsa::input]
 pub struct File {
     #[returns(ref)]
-    pub content: String,
-    pub version: i32,
+    pub content: Arc<str>,
 }
 
 #[salsa::tracked]
diff --git a/crates/squawk_ide/src/document_symbols.rs b/crates/squawk_ide/src/document_symbols.rs
index fd09880a..341642fd 100644
--- a/crates/squawk_ide/src/document_symbols.rs
+++ b/crates/squawk_ide/src/document_symbols.rs
@@ -854,7 +854,7 @@ mod tests {
 
     fn symbols_not_found(sql: &str) {
         let db = Database::default();
-        let file = File::new(&db, sql.to_string(), 0);
+        let file = File::new(&db, sql.to_string().into());
         let symbols = document_symbols(&db, file);
         if !symbols.is_empty() {
             panic!("Symbols found. If this is expected, use `symbols` instead.")
@@ -863,7 +863,7 @@ mod tests {
 
     fn symbols(sql: &str) -> String {
         let db = Database::default();
-        let file = File::new(&db, sql.to_string(), 0);
+        let file = File::new(&db, sql.to_string().into());
         let symbols = document_symbols(&db, file);
         if symbols.is_empty() {
             panic!("No symbols found. If this is expected, use `symbols_not_found` instead.")
diff --git a/crates/squawk_ide/src/find_references.rs b/crates/squawk_ide/src/find_references.rs
index 8847a938..d4772cb5 100644
--- a/crates/squawk_ide/src/find_references.rs
+++ b/crates/squawk_ide/src/find_references.rs
@@ -130,7 +130,7 @@ mod test {
         let (mut offset, sql) = fixture(sql);
         offset = offset.checked_sub(1.into()).unwrap_or_default();
         let db = Database::default();
-        let file = File::new(&db, sql.clone(), 0);
+        let file = File::new(&db, sql.clone().into());
         assert_eq!(crate::db::parse(&db, file).errors(), vec![]);
 
         let references = find_references(&db, file, offset);
diff --git a/crates/squawk_ide/src/folding_ranges.rs b/crates/squawk_ide/src/folding_ranges.rs
index 7bfb6019..79d43bed 100644
--- a/crates/squawk_ide/src/folding_ranges.rs
+++ b/crates/squawk_ide/src/folding_ranges.rs
@@ -235,7 +235,7 @@ mod tests {
 
     fn check(sql: &str) -> String {
         let db = Database::default();
-        let file = File::new(&db, sql.to_string(), 0);
+        let file = File::new(&db, sql.to_string().into());
         let folds = folding_ranges(&db, file);
 
         if folds.is_empty() {
diff --git a/crates/squawk_ide/src/goto_definition.rs b/crates/squawk_ide/src/goto_definition.rs
index 97b3bd2d..f20ed8d7 100644
--- a/crates/squawk_ide/src/goto_definition.rs
+++ b/crates/squawk_ide/src/goto_definition.rs
@@ -188,7 +188,7 @@ mod test {
         // marker after the item we're trying to go to def on.
         offset = offset.checked_sub(1.into()).unwrap_or_default();
         let db = Database::default();
-        let file = File::new(&db, sql.clone(), 0);
+        let file = File::new(&db, sql.clone().into());
         assert_eq!(crate::db::parse(&db, file).errors(), vec![]);
         let results = goto_definition(&db, file, offset);
         if !results.is_empty() {
diff --git a/crates/squawk_ide/src/hover.rs b/crates/squawk_ide/src/hover.rs
index 301978f9..a10c5e47 100644
--- a/crates/squawk_ide/src/hover.rs
+++ b/crates/squawk_ide/src/hover.rs
@@ -1687,7 +1687,7 @@ mod test {
         let db = Database::default();
         let (mut offset, sql) = fixture(sql);
         offset = offset.checked_sub(1.into()).unwrap_or_default();
-        let file = File::new(&db, sql.clone(), 0);
+        let file = File::new(&db, sql.clone().into());
         assert_eq!(crate::db::parse(&db, file).errors(), vec![]);
 
         if let Some(type_info) = hover(&db, file, offset) {
diff --git a/crates/squawk_ide/src/inlay_hints.rs b/crates/squawk_ide/src/inlay_hints.rs
index 8c7004fd..da604534 100644
--- a/crates/squawk_ide/src/inlay_hints.rs
+++ b/crates/squawk_ide/src/inlay_hints.rs
@@ -239,7 +239,7 @@ mod test {
     #[track_caller]
     fn check_inlay_hints(sql: &str) -> String {
         let db = Database::default();
-        let file = File::new(&db, sql.to_string(), 0);
+        let file = File::new(&db, sql.to_string().into());
 
         assert_eq!(crate::db::parse(&db, file).errors(), vec![]);
 
diff --git a/crates/squawk_server/src/handlers.rs b/crates/squawk_server/src/handlers.rs
index 2e53b9f9..22397e45 100644
--- a/crates/squawk_server/src/handlers.rs
+++ b/crates/squawk_server/src/handlers.rs
@@ -1,5 +1,6 @@
 mod code_action;
 mod completion;
+mod diagnostic;
 mod document_symbol;
 mod folding_range;
 mod goto_definition;
@@ -13,6 +14,7 @@ mod tokens;
 
 pub(crate) use code_action::handle_code_action;
 pub(crate) use completion::handle_completion;
+pub(crate) use diagnostic::handle_document_diagnostic;
 pub(crate) use document_symbol::handle_document_symbol;
 pub(crate) use folding_range::handle_folding_range;
 pub(crate) use goto_definition::handle_goto_definition;
diff --git a/crates/squawk_server/src/handlers/diagnostic.rs b/crates/squawk_server/src/handlers/diagnostic.rs
new file mode 100644
index 00000000..51b5ac28
--- /dev/null
+++ b/crates/squawk_server/src/handlers/diagnostic.rs
@@ -0,0 +1,29 @@
+use anyhow::Result;
+use lsp_types::{
+    DocumentDiagnosticParams, DocumentDiagnosticReport, DocumentDiagnosticReportResult,
+    FullDocumentDiagnosticReport, RelatedFullDocumentDiagnosticReport,
+};
+
+use crate::system::System;
+
+pub(crate) fn handle_document_diagnostic(
+    system: &dyn System,
+    params: DocumentDiagnosticParams,
+) -> Result<DocumentDiagnosticReportResult> {
+    let uri = params.text_document.uri;
+
+    let diagnostics = system
+        .file(&uri)
+        .map(|file| crate::lint::lint(system.db(), file))
+        .unwrap_or_default();
+
+    Ok(DocumentDiagnosticReportResult::Report(
+        DocumentDiagnosticReport::Full(RelatedFullDocumentDiagnosticReport {
+            related_documents: None,
+            full_document_diagnostic_report: FullDocumentDiagnosticReport {
+                result_id: None,
+                items: diagnostics,
+            },
+        }),
+    ))
+}
diff --git a/crates/squawk_server/src/handlers/notifications.rs b/crates/squawk_server/src/handlers/notifications.rs
index 9253afa9..59bff095 100644
--- a/crates/squawk_server/src/handlers/notifications.rs
+++ b/crates/squawk_server/src/handlers/notifications.rs
@@ -1,64 +1,33 @@
 use anyhow::Result;
 use lsp_server::{Connection, Message, Notification};
 use lsp_types::{
-    Diagnostic, DidChangeTextDocumentParams, DidCloseTextDocumentParams, DidOpenTextDocumentParams,
-    PublishDiagnosticsParams, Url,
+    DidChangeTextDocumentParams, DidCloseTextDocumentParams, DidOpenTextDocumentParams,
+    PublishDiagnosticsParams,
     notification::{Notification as _, PublishDiagnostics},
 };
 
 use crate::lsp_utils;
 use crate::system::{Document, System};
 
-fn publish_diagnostics(
-    connection: &Connection,
-    uri: Url,
-    version: i32,
-    diagnostics: Vec<Diagnostic>,
-) -> Result<()> {
-    let publish_params = PublishDiagnosticsParams {
-        uri,
-        diagnostics,
-        version: Some(version),
-    };
-
-    let notification = Notification {
-        method: PublishDiagnostics::METHOD.to_owned(),
-        params: serde_json::to_value(publish_params)?,
-    };
-
-    connection
-        .sender
-        .send(Message::Notification(notification))?;
-    Ok(())
-}
-
 pub(crate) fn handle_did_open(
-    connection: &Connection,
+    _connection: &Connection,
     params: DidOpenTextDocumentParams,
     system: &mut dyn System,
 ) -> Result<()> {
     let uri = params.text_document.uri;
     let content = params.text_document.text;
-    let version = params.text_document.version;
-
-    system.set(uri.clone(), Document { content, version });
-    let db = system.db();
-    let file = system.file(&uri).unwrap();
-    let diagnostics = crate::lint::lint(db, file);
 
-    // TODO: we need a better setup for "run func when input changed"
-    publish_diagnostics(connection, uri, version, diagnostics)?;
+    system.set(uri, Document { content });
 
     Ok(())
 }
 
 pub(crate) fn handle_did_change(
-    connection: &Connection,
+    _connection: &Connection,
     params: DidChangeTextDocumentParams,
     system: &mut dyn System,
 ) -> Result<()> {
     let uri = params.text_document.uri;
-    let version = params.text_document.version;
 
     let db = system.db();
     let file = system.file(&uri).unwrap();
@@ -67,16 +36,11 @@ pub(crate) fn handle_did_change(
     let updated_content = lsp_utils::apply_incremental_changes(content, params.content_changes);
 
     system.set(
-        uri.clone(),
+        uri,
         Document {
             content: updated_content,
-            version,
         },
     );
-    let db = system.db();
-    let file = system.file(&uri).unwrap();
-    let diagnostics = crate::lint::lint(db, file);
-    publish_diagnostics(connection, uri, version, diagnostics)?;
 
     Ok(())
 }
diff --git a/crates/squawk_server/src/ignore.rs b/crates/squawk_server/src/ignore.rs
index e4651a70..1d0dc9ba 100644
--- a/crates/squawk_server/src/ignore.rs
+++ b/crates/squawk_server/src/ignore.rs
@@ -202,7 +202,7 @@ create table c (
 
     fn lint_sql(sql: &str) -> Vec<lsp_types::Diagnostic> {
         let db = Database::default();
-        let file = File::new(&db, sql.to_owned(), 0);
+        let file = File::new(&db, sql.to_owned().into());
         lint(&db, file)
     }
 }
diff --git a/crates/squawk_server/src/server.rs b/crates/squawk_server/src/server.rs
index 350163b3..d69a86d1 100644
--- a/crates/squawk_server/src/server.rs
+++ b/crates/squawk_server/src/server.rs
@@ -3,22 +3,23 @@ use log::info;
 use lsp_server::{Connection, Message};
 use lsp_types::{
     CodeActionKind, CodeActionOptions, CodeActionProviderCapability, CompletionOptions,
-    FoldingRangeProviderCapability, HoverProviderCapability, InitializeParams, OneOf,
-    SelectionRangeProviderCapability, ServerCapabilities, TextDocumentSyncCapability,
-    TextDocumentSyncKind, WorkDoneProgressOptions,
+    DiagnosticOptions, DiagnosticServerCapabilities, FoldingRangeProviderCapability,
+    HoverProviderCapability, InitializeParams, OneOf, SelectionRangeProviderCapability,
+    ServerCapabilities, TextDocumentSyncCapability, TextDocumentSyncKind, WorkDoneProgressOptions,
     notification::{DidChangeTextDocument, DidCloseTextDocument, DidOpenTextDocument},
     request::{
-        CodeActionRequest, Completion, DocumentSymbolRequest, FoldingRangeRequest, GotoDefinition,
-        HoverRequest, InlayHintRequest, References, SelectionRangeRequest,
+        CodeActionRequest, Completion, DocumentDiagnosticRequest, DocumentSymbolRequest,
+        FoldingRangeRequest, GotoDefinition, HoverRequest, InlayHintRequest, References,
+        SelectionRangeRequest,
     },
 };
 
 use crate::dispatch::{NotificationDispatcher, RequestDispatcher};
 use crate::handlers::{
     SyntaxTreeRequest, TokensRequest, handle_code_action, handle_completion, handle_did_change,
-    handle_did_close, handle_did_open, handle_document_symbol, handle_folding_range,
-    handle_goto_definition, handle_hover, handle_inlay_hints, handle_references,
-    handle_selection_range, handle_syntax_tree, handle_tokens,
+    handle_did_close, handle_did_open, handle_document_diagnostic, handle_document_symbol,
+    handle_folding_range, handle_goto_definition, handle_hover, handle_inlay_hints,
+    handle_references, handle_selection_range, handle_syntax_tree, handle_tokens,
 };
 use crate::system::GlobalState;
 
@@ -46,6 +47,14 @@ pub fn run() -> Result<()> {
         definition_provider: Some(OneOf::Left(true)),
         hover_provider: Some(HoverProviderCapability::Simple(true)),
         inlay_hint_provider: Some(OneOf::Left(true)),
+        diagnostic_provider: Some(DiagnosticServerCapabilities::Options(DiagnosticOptions {
+            identifier: None,
+            inter_file_dependencies: false,
+            workspace_diagnostics: false,
+            work_done_progress_options: WorkDoneProgressOptions {
+                work_done_progress: None,
+            },
+        })),
         document_symbol_provider: Some(OneOf::Left(true)),
         folding_range_provider: Some(FoldingRangeProviderCapability::Simple(true)),
         completion_provider: Some(CompletionOptions {
@@ -102,6 +111,7 @@ fn main_loop(connection: Connection, params: serde_json::Value) -> Result<()> {
                     .on::<DocumentSymbolRequest>(handle_document_symbol)?
                     .on::<FoldingRangeRequest>(handle_folding_range)?
                     .on::<Completion>(handle_completion)?
+                    .on::<DocumentDiagnosticRequest>(handle_document_diagnostic)?
                     .on::<SyntaxTreeRequest>(handle_syntax_tree)?
                     .on::<TokensRequest>(handle_tokens)?
                     .on::<References>(handle_references)?
diff --git a/crates/squawk_server/src/system.rs b/crates/squawk_server/src/system.rs
index 77f4677f..3a5e43f6 100644
--- a/crates/squawk_server/src/system.rs
+++ b/crates/squawk_server/src/system.rs
@@ -5,8 +5,6 @@ use std::collections::HashMap;
 
 pub(crate) struct Document {
     pub(crate) content: String,
-    #[allow(dead_code)]
-    pub(crate) version: i32,
 }
 
 pub(crate) trait System {
@@ -41,10 +39,9 @@ impl System for GlobalState {
 
     fn set(&mut self, uri: Url, doc: Document) {
         if let Some(file) = self.files.get(&uri).copied() {
-            file.set_content(&mut self.db).to(doc.content);
-            file.set_version(&mut self.db).to(doc.version);
+            file.set_content(&mut self.db).to(doc.content.into());
         } else {
-            let file = File::new(&self.db, doc.content, doc.version);
+            let file = File::new(&self.db, doc.content.into());
             self.files.insert(uri, file);
         }
     }
diff --git a/crates/squawk_wasm/src/lib.rs b/crates/squawk_wasm/src/lib.rs
index f57de406..468f66ac 100644
--- a/crates/squawk_wasm/src/lib.rs
+++ b/crates/squawk_wasm/src/lib.rs
@@ -45,14 +45,13 @@ impl SquawkDatabase {
     }
 
     pub fn open_file(&mut self, content: String) {
-        let file = File::new(&self.db, content, 0);
+        let file = File::new(&self.db, content.into());
         self.file = Some(file);
     }
 
-    pub fn update_file(&mut self, content: String, version: i32) {
+    pub fn update_file(&mut self, content: String) {
         if let Some(file) = self.file {
-            file.set_content(&mut self.db).to(content);
-            file.set_version(&mut self.db).to(version);
+            file.set_content(&mut self.db).to(content.into());
         }
     }