diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 00f80bafb..f17f62cbb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,31 +24,23 @@ jobs:
     name: Rustfmt
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
         with:
             toolchain: nightly
             components: rustfmt
-            override: true
-      - uses: actions-rs/cargo@v1
-        with:
-          command: fmt
-          args: --all -- --check
+      - name: Run fmt
+        run: cargo +nightly fmt --all -- --check
 
   clippy:
     name: Clippy
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-            toolchain: stable
-            components: clippy
-            override: true
-      - uses: actions-rs/clippy-check@v1
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          args: --all-features --all-targets --manifest-path Cargo.toml -- -D warnings
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Run clippy
+        run: |
+          cargo clippy --locked --all-features --all-targets --manifest-path Cargo.toml -- -D warnings
 
   crates:
     name: Rust Tests
diff --git a/crates/cli/src/command/ctags/recursive_tags.rs b/crates/cli/src/command/ctags/recursive_tags.rs
index 91905a836..108092285 100644
--- a/crates/cli/src/command/ctags/recursive_tags.rs
+++ b/crates/cli/src/command/ctags/recursive_tags.rs
@@ -6,10 +6,9 @@ use clap::Parser;
 use filter::{FilterContext, SequentialSource};
 use itertools::Itertools;
 use maple_core::process::ShellCommand;
-use maple_core::tools::ctags::{ProjectCtagsCommand, CTAGS_HAS_JSON_FEATURE};
+use maple_core::tools::ctags::{ProjectCtagsCommand, CTAGS_BIN};
 use matcher::{MatchScope, MatcherBuilder};
 use rayon::prelude::*;
-use std::ops::Deref;
 use std::sync::Arc;
 use types::ClapItem;
 
@@ -65,11 +64,7 @@ impl RecursiveTags {
             ..
         }: Args,
     ) -> Result<()> {
-        if !CTAGS_HAS_JSON_FEATURE.deref() {
-            return Err(anyhow::anyhow!(
-                "ctags executable is not compiled with +json feature, please recompile it."
-            ));
-        }
+        CTAGS_BIN.ensure_json_feature()?;
 
         let mut ctags_cmd = self.project_ctags_cmd()?;
 
diff --git a/crates/code_tools/src/linting/linters/typos.rs b/crates/code_tools/src/linting/linters/typos.rs
index f5140eded..48151d32b 100644
--- a/crates/code_tools/src/linting/linters/typos.rs
+++ b/crates/code_tools/src/linting/linters/typos.rs
@@ -76,7 +76,7 @@ enum Message<'m> {
     Typo(Typo<'m>),
 }
 
-impl<'m> Message<'m> {
+impl Message<'_> {
     fn try_into_diagnostic(self) -> Option<Diagnostic> {
         match self {
             Self::Typo(typo) => {
diff --git a/crates/code_tools/src/linting/mod.rs b/crates/code_tools/src/linting/mod.rs
index 6d438a036..488618e82 100644
--- a/crates/code_tools/src/linting/mod.rs
+++ b/crates/code_tools/src/linting/mod.rs
@@ -119,7 +119,7 @@ enum WorkspaceMarker {
 }
 
 impl WorkspaceMarker {
-    fn find_workspace<'a>(&'a self, source_file: &'a Path) -> Option<&Path> {
+    fn find_workspace<'a>(&self, source_file: &'a Path) -> Option<&'a Path> {
         match self {
             Self::RootMarkers(root_markers) => paths::find_project_root(source_file, root_markers),
             Self::ParentOfSourceFile => Some(source_file.parent().unwrap_or(source_file)),
diff --git a/crates/maple_core/src/stdio_server/diagnostics_worker.rs b/crates/maple_core/src/stdio_server/diagnostics_worker.rs
index b42091088..5ba024828 100644
--- a/crates/maple_core/src/stdio_server/diagnostics_worker.rs
+++ b/crates/maple_core/src/stdio_server/diagnostics_worker.rs
@@ -191,6 +191,16 @@ fn update_buffer_diagnostics(
         .compare_exchange(false, true, Ordering::SeqCst, Ordering::SeqCst)
         .is_ok();
 
+    tracing::info!(
+        ?bufnr,
+        ?is_first_result,
+        "[update_buffer_diagnostics] buffer_diagnostics: {buffer_diagnostics:?}"
+    );
+    tracing::info!(
+        ?bufnr,
+        "[update_buffer_diagnostics] new_diagnostics: {new_diagnostics:?}"
+    );
+
     let new_stats = if is_first_result {
         let _ = vim.exec(
             "clap#plugin#diagnostics#refresh_highlights",
@@ -206,12 +216,12 @@ fn update_buffer_diagnostics(
             .filter(|d| !existing.contains(d))
             .collect::<Vec<_>>();
 
-        followup_diagnostics.dedup();
-
         // Must drop the lock otherwise the deadlock occurs as
         // the write lock will be acquired later.
         drop(existing);
 
+        followup_diagnostics.dedup();
+
         if !followup_diagnostics.is_empty() {
             let _ = vim.exec(
                 "clap#plugin#diagnostics#add_highlights",
diff --git a/crates/maple_core/src/stdio_server/mod.rs b/crates/maple_core/src/stdio_server/mod.rs
index 35cadc445..84edd32e7 100644
--- a/crates/maple_core/src/stdio_server/mod.rs
+++ b/crates/maple_core/src/stdio_server/mod.rs
@@ -165,7 +165,11 @@ fn initialize_service(vim: Vim) -> InitializedService {
     }
 
     if plugin_config.ctags.enable {
-        register_plugin(Box::new(CtagsPlugin::new(vim.clone())), None);
+        if crate::tools::ctags::CTAGS_BIN.is_available() {
+            register_plugin(Box::new(CtagsPlugin::new(vim.clone())), None);
+        } else {
+            tracing::warn!("Failed to register ctags plugin as ctags executable not found");
+        }
     }
 
     if plugin_config.markdown.enable {
diff --git a/crates/maple_core/src/stdio_server/plugin/system.rs b/crates/maple_core/src/stdio_server/plugin/system.rs
index 0211be733..662e9aa2a 100644
--- a/crates/maple_core/src/stdio_server/plugin/system.rs
+++ b/crates/maple_core/src/stdio_server/plugin/system.rs
@@ -78,16 +78,21 @@ fn parse_vim_which_key_map(config_file: &str) -> HashMap<char, HashMap<char, Str
 }
 
 fn note_recent_file(file_path: String) {
-    tracing::debug!(?file_path, "Received a recent file notification");
-
     let Ok(path) = std::fs::canonicalize(&file_path) else {
+        tracing::debug!(?file_path, "Ignored a recent file notification");
         return;
     };
 
     if !path.exists() || !path.is_file() {
+        tracing::debug!(
+            ?file_path,
+            "Ignored a recent file notification: not a valid file"
+        );
         return;
     }
 
+    tracing::debug!("Received a recent file notification: {}", path.display());
+
     let mut recent_files = RECENT_FILES_IN_MEMORY.write();
     recent_files.upsert(file_path);
 }
diff --git a/crates/maple_core/src/stdio_server/provider/impls/dumb_jump/mod.rs b/crates/maple_core/src/stdio_server/provider/impls/dumb_jump/mod.rs
index f56054a1b..53601c5a9 100644
--- a/crates/maple_core/src/stdio_server/provider/impls/dumb_jump/mod.rs
+++ b/crates/maple_core/src/stdio_server/provider/impls/dumb_jump/mod.rs
@@ -8,7 +8,7 @@ use crate::stdio_server::provider::{
     BaseArgs, ClapProvider, Context, ProviderError, ProviderResult,
 };
 use crate::stdio_server::vim::VimResult;
-use crate::tools::ctags::{get_language, TagsGenerator, CTAGS_EXISTS};
+use crate::tools::ctags::{get_language, TagsGenerator, CTAGS_BIN};
 use crate::tools::gtags::GTAGS_EXISTS;
 use filter::Query;
 use futures::Future;
@@ -214,7 +214,7 @@ impl DumbJumpProvider {
                 });
             }
 
-            match (*CTAGS_EXISTS, *GTAGS_EXISTS) {
+            match (CTAGS_BIN.is_available(), *GTAGS_EXISTS) {
                 (true, true) => run(
                     async move {
                         futures::future::join(ctags_future, gtags_future).await;
diff --git a/crates/maple_core/src/tools/ctags/context_tag.rs b/crates/maple_core/src/tools/ctags/context_tag.rs
index 9f86370c4..338291b01 100644
--- a/crates/maple_core/src/tools/ctags/context_tag.rs
+++ b/crates/maple_core/src/tools/ctags/context_tag.rs
@@ -1,7 +1,6 @@
-use crate::tools::ctags::{BufferTag, CTAGS_HAS_JSON_FEATURE};
+use crate::tools::ctags::{BufferTag, CTAGS_BIN};
 use rayon::prelude::*;
 use std::io::Result;
-use std::ops::Deref;
 use std::path::Path;
 use std::process::Stdio;
 use std::sync::atomic::{AtomicUsize, Ordering};
@@ -94,7 +93,7 @@ fn find_context_tag(superset_tags: Vec<BufferTag>, at: usize) -> Option<BufferTa
 ///
 /// NOTE: I don't know why, but this may take forever to complete somehow, making the async runtime blocked.
 pub async fn current_context_tag_async(file: &Path, at: usize) -> Option<BufferTag> {
-    let superset_tags = if *CTAGS_HAS_JSON_FEATURE.deref() {
+    let superset_tags = if CTAGS_BIN.has_json_feature() {
         collect_superset_context_tags_async(tokio_cmd(file, true), BufferTag::from_json_line, at)
             .await
     } else {
@@ -107,7 +106,7 @@ pub async fn current_context_tag_async(file: &Path, at: usize) -> Option<BufferT
 
 /// Returns the method/function context associated with line `at`.
 pub fn current_context_tag(file: &Path, at: usize) -> Option<BufferTag> {
-    let superset_tags = if *CTAGS_HAS_JSON_FEATURE.deref() {
+    let superset_tags = if CTAGS_BIN.has_json_feature() {
         collect_superset_context_tags(subprocess_cmd(file, true), BufferTag::from_json_line, at)
     } else {
         collect_superset_context_tags(subprocess_cmd(file, false), BufferTag::from_raw_line, at)
@@ -120,7 +119,7 @@ pub fn buffer_tags_lines(
     file: impl AsRef<std::ffi::OsStr>,
     force_raw: bool,
 ) -> Result<Vec<String>> {
-    let (tags, max_name_len) = if *CTAGS_HAS_JSON_FEATURE.deref() && !force_raw {
+    let (tags, max_name_len) = if CTAGS_BIN.has_json_feature() && !force_raw {
         collect_buffer_tags(subprocess_cmd(file, true), BufferTag::from_json_line)?
     } else {
         collect_buffer_tags(subprocess_cmd(file, false), BufferTag::from_raw_line)?
@@ -133,7 +132,7 @@ pub fn buffer_tags_lines(
 }
 
 pub fn fetch_buffer_tags(file: impl AsRef<std::ffi::OsStr>) -> Result<Vec<BufferTag>> {
-    let (mut tags, _max_name_len) = if *CTAGS_HAS_JSON_FEATURE.deref() {
+    let (mut tags, _max_name_len) = if CTAGS_BIN.has_json_feature() {
         collect_buffer_tags(subprocess_cmd(file, true), BufferTag::from_json_line)?
     } else {
         collect_buffer_tags(subprocess_cmd(file, false), BufferTag::from_raw_line)?
@@ -148,7 +147,7 @@ pub fn buffer_tag_items(
     file: impl AsRef<std::ffi::OsStr>,
     force_raw: bool,
 ) -> Result<Vec<Arc<dyn ClapItem>>> {
-    let (tags, max_name_len) = if *CTAGS_HAS_JSON_FEATURE.deref() && !force_raw {
+    let (tags, max_name_len) = if CTAGS_BIN.has_json_feature() && !force_raw {
         collect_buffer_tags(subprocess_cmd(file, true), BufferTag::from_json_line)?
     } else {
         collect_buffer_tags(subprocess_cmd(file, false), BufferTag::from_raw_line)?
diff --git a/crates/maple_core/src/tools/ctags/mod.rs b/crates/maple_core/src/tools/ctags/mod.rs
index 61301073e..cb8cb6fc1 100644
--- a/crates/maple_core/src/tools/ctags/mod.rs
+++ b/crates/maple_core/src/tools/ctags/mod.rs
@@ -40,8 +40,50 @@ pub static CTAGS_TAGS_DIR: Lazy<PathBuf> = Lazy::new(|| {
     tags_dir
 });
 
-pub static CTAGS_EXISTS: Lazy<bool> = Lazy::new(|| {
-    std::process::Command::new("ctags")
+pub enum CtagsBinary {
+    /// ctags executable exists.
+    Available {
+        /// Whether the ctags executable supports `--output-format=json`.
+        json_feature: bool,
+    },
+    /// ctags executable does not exist.
+    NotFound,
+}
+
+impl CtagsBinary {
+    pub fn is_available(&self) -> bool {
+        matches!(self, Self::Available { .. })
+    }
+
+    pub fn has_json_feature(&self) -> bool {
+        match self {
+            Self::Available { json_feature } => *json_feature,
+            Self::NotFound => false,
+        }
+    }
+
+    pub fn ensure_json_feature(&self) -> std::io::Result<()> {
+        match self {
+            Self::Available { json_feature } => {
+                if *json_feature {
+                    Ok(())
+                } else {
+                    Err(Error::new(
+                        ErrorKind::Other,
+                        "ctags executable is not compiled with +json feature, please recompile it.",
+                    ))
+                }
+            }
+            Self::NotFound => Err(Error::new(
+                ErrorKind::NotFound,
+                "ctags executable not found",
+            )),
+        }
+    }
+}
+
+pub static CTAGS_BIN: Lazy<CtagsBinary> = Lazy::new(|| {
+    let ctags_exist = std::process::Command::new("ctags")
         .arg("--version")
         .stderr(std::process::Stdio::inherit())
         .output()
@@ -53,25 +95,24 @@ pub static CTAGS_EXISTS: Lazy<bool> = Lazy::new(|| {
                 .next()
                 .map(|line| line.starts_with("Universal Ctags"))
         })
-        .unwrap_or(false)
-});
+        .unwrap_or(false);
 
-/// If the ctags executable supports `--output-format=json`.
-pub static CTAGS_HAS_JSON_FEATURE: Lazy<bool> = Lazy::new(|| {
     fn detect_json_feature() -> std::io::Result<bool> {
         let output = std::process::Command::new("ctags")
             .arg("--list-features")
             .stderr(std::process::Stdio::inherit())
             .output()?;
         let stdout = String::from_utf8_lossy(&output.stdout);
-        if stdout.split('\n').any(|x| x.starts_with("json")) {
-            Ok(true)
-        } else {
-            Err(Error::new(ErrorKind::Other, "ctags has no +json feature"))
-        }
+        Ok(stdout.split('\n').any(|x| x.starts_with("json")))
     }
 
-    detect_json_feature().unwrap_or(false)
+    if ctags_exist {
+        CtagsBinary::Available {
+            json_feature: detect_json_feature().unwrap_or(false),
+        }
+    } else {
+        CtagsBinary::NotFound
+    }
 });
 
 /// Used to specify the language when working with `readtags`.
diff --git a/crates/rpc/src/jsonrpc.rs b/crates/rpc/src/jsonrpc.rs
index 60cae448e..b646fa312 100644
--- a/crates/rpc/src/jsonrpc.rs
+++ b/crates/rpc/src/jsonrpc.rs
@@ -40,7 +40,7 @@ impl Serialize for Version {
 
 struct VersionVisitor;
 
-impl<'v> serde::de::Visitor<'v> for VersionVisitor {
+impl serde::de::Visitor<'_> for VersionVisitor {
     type Value = Version;
 
     fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
diff --git a/crates/tree_sitter/src/utf8_char_indices.rs b/crates/tree_sitter/src/utf8_char_indices.rs
index 9168c61ec..82f1bce94 100644
--- a/crates/tree_sitter/src/utf8_char_indices.rs
+++ b/crates/tree_sitter/src/utf8_char_indices.rs
@@ -13,7 +13,7 @@ impl<'a> UncheckedUtf8CharIndices<'a> {
     }
 }
 
-impl<'a> Iterator for UncheckedUtf8CharIndices<'a> {
+impl Iterator for UncheckedUtf8CharIndices<'_> {
     type Item = (usize, char);
 
     fn next(&mut self) -> Option<Self::Item> {
@@ -49,7 +49,7 @@ impl<'a> Utf8CharIndices<'a> {
     }
 }
 
-impl<'a> Iterator for Utf8CharIndices<'a> {
+impl Iterator for Utf8CharIndices<'_> {
     type Item = (usize, char);
 
     fn next(&mut self) -> Option<Self::Item> {
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 8cca5be05..a718dc2fc 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.80"
+channel = "1.83"