diff --git a/Cargo.lock b/Cargo.lock
index 2628c9a9d1..14f1d9d08b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1008,18 +1008,6 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
-[[package]]
-name = "lsp-server"
-version = "0.7.7"
-dependencies = [
- "crossbeam-channel",
- "ctrlc",
- "log",
- "lsp-types",
- "serde",
- "serde_json",
-]
-
 [[package]]
 name = "lsp-server"
 version = "0.7.7"
@@ -1032,6 +1020,19 @@ dependencies = [
  "serde_json",
 ]
 
+[[package]]
+name = "lsp-server"
+version = "0.7.8"
+dependencies = [
+ "crossbeam-channel",
+ "ctrlc",
+ "log",
+ "lsp-types",
+ "serde",
+ "serde_derive",
+ "serde_json",
+]
+
 [[package]]
 name = "lsp-types"
 version = "0.95.0"
@@ -1289,7 +1290,6 @@ name = "paths"
 version = "0.0.0"
 dependencies = [
  "camino",
- "serde",
 ]
 
 [[package]]
@@ -1357,6 +1357,7 @@ dependencies = [
  "paths",
  "rustc-hash 2.0.0",
  "serde",
+ "serde_derive",
  "serde_json",
  "span",
  "stdx",
@@ -1446,6 +1447,7 @@ dependencies = [
  "rustc-hash 2.0.0",
  "semver",
  "serde",
+ "serde_derive",
  "serde_json",
  "span",
  "stdx",
@@ -1674,7 +1676,7 @@ dependencies = [
  "intern",
  "itertools",
  "load-cargo",
- "lsp-server 0.7.7 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lsp-server 0.7.7",
  "lsp-types",
  "memchr",
  "mimalloc",
@@ -1693,6 +1695,7 @@ dependencies = [
  "scip",
  "semver",
  "serde",
+ "serde_derive",
  "serde_json",
  "stdx",
  "syntax",
@@ -1820,18 +1823,18 @@ dependencies = [
 
 [[package]]
 name = "serde"
-version = "1.0.206"
+version = "1.0.216"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b3e4cd94123dd520a128bcd11e34d9e9e423e7e3e50425cb1b4b1e3549d0284"
+checksum = "0b9781016e935a97e8beecf0c933758c97a5520d32930e460142b4cd80c6338e"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.206"
+version = "1.0.216"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fabfb6138d2383ea8208cf98ccf69cdfb1aff4088460681d84189aa259762f97"
+checksum = "46f859dbbf73865c6627ed570e78961cd3ac92407a2d117204c49232485da55e"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -1922,12 +1925,6 @@ version = "0.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3b9b39299b249ad65f3b7e96443bad61c02ca5cd3589f46cb6d610a0fd6c0d6a"
 
-[[package]]
-name = "stable_deref_trait"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"
-
 [[package]]
 name = "stdx"
 version = "0.0.0"
@@ -1944,9 +1941,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.74"
+version = "2.0.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1fceb41e3d546d0bd83421d3409b1460cc7444cd389341a4c880fe7a042cb3d7"
+checksum = "25aa4ce346d03a6dcd68dd8b4010bcb74e54e62c90c573f394c46eae99aba32d"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -2262,13 +2259,9 @@ dependencies = [
 
 [[package]]
 name = "triomphe"
-version = "0.1.13"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e6631e42e10b40c0690bf92f404ebcfe6e1fdb480391d15f17cc8e96eeed5369"
-dependencies = [
- "serde",
- "stable_deref_trait",
-]
+checksum = "ef8f7726da4807b58ea5c96fdc122f80702030edc33b35aff9190a51148ccc85"
 
 [[package]]
 name = "tt"
diff --git a/Cargo.toml b/Cargo.toml
index 8086569a78..1e5577554e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -138,7 +138,8 @@ pulldown-cmark = { version = "0.9.0", default-features = false }
 rayon = "1.8.0"
 rustc-hash = "2.0.0"
 semver = "1.0.14"
-serde = { version = "1.0.192", features = ["derive"] }
+serde = { version = "1.0.192" }
+serde_derive = { version = "1.0.192" }
 serde_json = "1.0.108"
 smallvec = { version = "1.10.0", features = [
   "const_new",
@@ -157,7 +158,7 @@ tracing-subscriber = { version = "0.3.18", default-features = false, features =
   "time",
   "tracing-log",
 ] }
-triomphe = { version = "0.1.10", default-features = false, features = ["std"] }
+triomphe = { version = "0.1.14", default-features = false, features = ["std"] }
 url = "2.3.1"
 xshell = "0.2.5"
 
diff --git a/crates/paths/Cargo.toml b/crates/paths/Cargo.toml
index d4b0a54ed6..f0dafab70c 100644
--- a/crates/paths/Cargo.toml
+++ b/crates/paths/Cargo.toml
@@ -14,10 +14,9 @@ doctest = false
 
 [dependencies]
 camino.workspace = true
-serde = { workspace = true, optional = true }
 
 [features]
-serde1 = ["camino/serde1", "dep:serde"]
+serde1 = ["camino/serde1"]
 
 [lints]
 workspace = true
diff --git a/crates/proc-macro-api/Cargo.toml b/crates/proc-macro-api/Cargo.toml
index 911301e22b..dac8e09435 100644
--- a/crates/proc-macro-api/Cargo.toml
+++ b/crates/proc-macro-api/Cargo.toml
@@ -14,6 +14,7 @@ doctest = false
 
 [dependencies]
 serde.workspace = true
+serde_derive.workspace = true
 serde_json = { workspace = true, features = ["unbounded_depth"] }
 tracing.workspace = true
 rustc-hash.workspace = true
diff --git a/crates/proc-macro-api/src/msg.rs b/crates/proc-macro-api/src/msg.rs
index 883528558d..bbd9f582df 100644
--- a/crates/proc-macro-api/src/msg.rs
+++ b/crates/proc-macro-api/src/msg.rs
@@ -4,7 +4,8 @@ pub(crate) mod flat;
 use std::io::{self, BufRead, Write};
 
 use paths::Utf8PathBuf;
-use serde::{de::DeserializeOwned, Deserialize, Serialize};
+use serde::de::DeserializeOwned;
+use serde_derive::{Deserialize, Serialize};
 
 use crate::ProcMacroKind;
 
@@ -123,7 +124,7 @@ impl ExpnGlobals {
     }
 }
 
-pub trait Message: Serialize + DeserializeOwned {
+pub trait Message: serde::Serialize + DeserializeOwned {
     fn read<R: BufRead>(
         from_proto: ProtocolRead<R>,
         inp: &mut R,
diff --git a/crates/proc-macro-api/src/msg/flat.rs b/crates/proc-macro-api/src/msg/flat.rs
index af3412e90e..5de1e59f28 100644
--- a/crates/proc-macro-api/src/msg/flat.rs
+++ b/crates/proc-macro-api/src/msg/flat.rs
@@ -39,7 +39,7 @@ use std::collections::VecDeque;
 
 use intern::Symbol;
 use rustc_hash::FxHashMap;
-use serde::{Deserialize, Serialize};
+use serde_derive::{Deserialize, Serialize};
 use span::{EditionedFileId, ErasedFileAstId, Span, SpanAnchor, SyntaxContextId, TextRange};
 
 use crate::msg::EXTENDED_LEAF_DATA;
diff --git a/crates/project-model/Cargo.toml b/crates/project-model/Cargo.toml
index 68e0e1ba55..ed647950e6 100644
--- a/crates/project-model/Cargo.toml
+++ b/crates/project-model/Cargo.toml
@@ -19,6 +19,7 @@ rustc-hash.workspace = true
 semver.workspace = true
 serde_json.workspace = true
 serde.workspace = true
+serde_derive.workspace = true
 tracing.workspace = true
 triomphe.workspace = true
 la-arena.workspace = true
diff --git a/crates/project-model/src/build_dependencies.rs b/crates/project-model/src/build_dependencies.rs
index dc71b13eee..524323b973 100644
--- a/crates/project-model/src/build_dependencies.rs
+++ b/crates/project-model/src/build_dependencies.rs
@@ -15,7 +15,7 @@ use itertools::Itertools;
 use la_arena::ArenaMap;
 use paths::{AbsPath, AbsPathBuf, Utf8PathBuf};
 use rustc_hash::{FxHashMap, FxHashSet};
-use serde::Deserialize;
+use serde::Deserialize as _;
 use toolchain::Tool;
 
 use crate::{
diff --git a/crates/project-model/src/cargo_workspace.rs b/crates/project-model/src/cargo_workspace.rs
index 4ae3426ed9..ba4946bf0b 100644
--- a/crates/project-model/src/cargo_workspace.rs
+++ b/crates/project-model/src/cargo_workspace.rs
@@ -8,7 +8,7 @@ use cargo_metadata::{CargoOpt, MetadataCommand};
 use la_arena::{Arena, Idx};
 use paths::{AbsPath, AbsPathBuf, Utf8PathBuf};
 use rustc_hash::{FxHashMap, FxHashSet};
-use serde::Deserialize;
+use serde_derive::Deserialize;
 use serde_json::from_value;
 use span::Edition;
 use toolchain::Tool;
diff --git a/crates/ra-salsa/Cargo.toml b/crates/ra-salsa/Cargo.toml
index f8a3156fe4..57a20be0ca 100644
--- a/crates/ra-salsa/Cargo.toml
+++ b/crates/ra-salsa/Cargo.toml
@@ -20,7 +20,7 @@ parking_lot = "0.12.1"
 rustc-hash = "2.0.0"
 smallvec = "1.0.0"
 oorandom = "11"
-triomphe = "0.1.11"
+triomphe.workspace = true
 itertools.workspace = true
 
 ra-salsa-macros = { version = "0.0.0", path = "ra-salsa-macros", package = "salsa-macros" }
diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index 7c8610280b..fa9ff6b56d 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -36,6 +36,7 @@ rayon.workspace = true
 rustc-hash.workspace = true
 serde_json = { workspace = true, features = ["preserve_order"] }
 serde.workspace = true
+serde_derive.workspace = true
 tenthash = "0.4.0"
 num_cpus = "1.15.0"
 mimalloc = { version = "0.1.30", default-features = false, optional = true }
diff --git a/crates/rust-analyzer/src/flycheck.rs b/crates/rust-analyzer/src/flycheck.rs
index b035d779a7..f2ad4f081c 100644
--- a/crates/rust-analyzer/src/flycheck.rs
+++ b/crates/rust-analyzer/src/flycheck.rs
@@ -6,7 +6,8 @@ use std::{fmt, io, process::Command, time::Duration};
 use crossbeam_channel::{select_biased, unbounded, Receiver, Sender};
 use paths::{AbsPath, AbsPathBuf, Utf8PathBuf};
 use rustc_hash::FxHashMap;
-use serde::Deserialize;
+use serde::Deserialize as _;
+use serde_derive::Deserialize;
 
 pub(crate) use cargo_metadata::diagnostic::{
     Applicability, Diagnostic, DiagnosticCode, DiagnosticLevel, DiagnosticSpan,
diff --git a/crates/rust-analyzer/src/test_runner.rs b/crates/rust-analyzer/src/test_runner.rs
index 5e43a3c60d..2fd5254733 100644
--- a/crates/rust-analyzer/src/test_runner.rs
+++ b/crates/rust-analyzer/src/test_runner.rs
@@ -5,7 +5,8 @@ use std::process::Command;
 
 use crossbeam_channel::Sender;
 use paths::AbsPath;
-use serde::Deserialize;
+use serde::Deserialize as _;
+use serde_derive::Deserialize;
 use toolchain::Tool;
 
 use crate::{
diff --git a/crates/rust-analyzer/src/tracing/json.rs b/crates/rust-analyzer/src/tracing/json.rs
index f540a33b45..9e35990a5b 100644
--- a/crates/rust-analyzer/src/tracing/json.rs
+++ b/crates/rust-analyzer/src/tracing/json.rs
@@ -54,7 +54,7 @@ where
     fn on_event(&self, _event: &Event<'_>, _ctx: Context<'_, S>) {}
 
     fn on_close(&self, id: Id, ctx: Context<'_, S>) {
-        #[derive(serde::Serialize)]
+        #[derive(serde_derive::Serialize)]
         struct JsonDataInner {
             name: &'static str,
             elapsed_ms: u128,
diff --git a/crates/span/src/lib.rs b/crates/span/src/lib.rs
index e12575b9b1..20c3b087af 100644
--- a/crates/span/src/lib.rs
+++ b/crates/span/src/lib.rs
@@ -262,8 +262,9 @@ pub struct MacroFileId {
 /// `MacroCallId` identifies a particular macro invocation, like
 /// `println!("Hello, {}", world)`.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
-pub struct MacroCallId(ra_salsa::InternId);
+pub struct MacroCallId(InternId);
 
+#[cfg(feature = "ra-salsa")]
 impl ra_salsa::InternKey for MacroCallId {
     fn from_intern_id(v: ra_salsa::InternId) -> Self {
         MacroCallId(v)
@@ -362,6 +363,7 @@ mod intern_id_proxy {
     use std::fmt;
     use std::num::NonZeroU32;
 
+    #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
     pub(super) struct InternId {
         value: NonZeroU32,
     }
diff --git a/lib/lsp-server/Cargo.toml b/lib/lsp-server/Cargo.toml
index cce007ae54..2fa3272e65 100644
--- a/lib/lsp-server/Cargo.toml
+++ b/lib/lsp-server/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "lsp-server"
-version = "0.7.7"
+version = "0.7.8"
 description = "Generic LSP server scaffold."
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/rust-lang/rust-analyzer/tree/master/lib/lsp-server"
@@ -9,7 +9,8 @@ edition = "2021"
 [dependencies]
 log = "0.4.17"
 serde_json = "1.0.108"
-serde = { version = "1.0.192", features = ["derive"] }
+serde = { version = "1.0.216" }
+serde_derive = { version = "1.0.216" }
 crossbeam-channel.workspace = true
 
 [dev-dependencies]
diff --git a/lib/lsp-server/src/msg.rs b/lib/lsp-server/src/msg.rs
index 53c64796f2..11f98f5079 100644
--- a/lib/lsp-server/src/msg.rs
+++ b/lib/lsp-server/src/msg.rs
@@ -3,7 +3,8 @@ use std::{
     io::{self, BufRead, Write},
 };
 
-use serde::{de::DeserializeOwned, Deserialize, Serialize};
+use serde::de::DeserializeOwned;
+use serde_derive::{Deserialize, Serialize};
 
 use crate::error::ExtractError;
 
@@ -196,7 +197,7 @@ impl Message {
 }
 
 impl Response {
-    pub fn new_ok<R: Serialize>(id: RequestId, result: R) -> Response {
+    pub fn new_ok<R: serde::Serialize>(id: RequestId, result: R) -> Response {
         Response { id, result: Some(serde_json::to_value(result).unwrap()), error: None }
     }
     pub fn new_err(id: RequestId, code: i32, message: String) -> Response {
@@ -206,7 +207,7 @@ impl Response {
 }
 
 impl Request {
-    pub fn new<P: Serialize>(id: RequestId, method: String, params: P) -> Request {
+    pub fn new<P: serde::Serialize>(id: RequestId, method: String, params: P) -> Request {
         Request { id, method, params: serde_json::to_value(params).unwrap() }
     }
     pub fn extract<P: DeserializeOwned>(
@@ -231,7 +232,7 @@ impl Request {
 }
 
 impl Notification {
-    pub fn new(method: String, params: impl Serialize) -> Notification {
+    pub fn new(method: String, params: impl serde::Serialize) -> Notification {
         Notification { method, params: serde_json::to_value(params).unwrap() }
     }
     pub fn extract<P: DeserializeOwned>(
diff --git a/lib/lsp-server/src/req_queue.rs b/lib/lsp-server/src/req_queue.rs
index 347a9fb6fb..c216864bee 100644
--- a/lib/lsp-server/src/req_queue.rs
+++ b/lib/lsp-server/src/req_queue.rs
@@ -1,7 +1,5 @@
 use std::collections::HashMap;
 
-use serde::Serialize;
-
 use crate::{ErrorCode, Request, RequestId, Response, ResponseError};
 
 /// Manages the set of pending requests, both incoming and outgoing.
@@ -56,7 +54,7 @@ impl<I> Incoming<I> {
 }
 
 impl<O> Outgoing<O> {
-    pub fn register<P: Serialize>(&mut self, method: String, params: P, data: O) -> Request {
+    pub fn register<P: serde::Serialize>(&mut self, method: String, params: P, data: O) -> Request {
         let id = RequestId::from(self.next_id);
         self.pending.insert(id.clone(), data);
         self.next_id += 1;
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 01ad333631..b505ee835b 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -16,7 +16,8 @@ xflags = "0.3.0"
 time = { version = "0.3", default-features = false }
 zip = { version = "0.6", default-features = false, features = ["deflate", "time"] }
 stdx.workspace = true
-proc-macro2 = "1.0.47"
+# https://github.com/dtolnay/proc-macro2/issues/475
+proc-macro2 = "=1.0.86"
 quote = "1.0.20"
 ungrammar = "1.16.1"
 either.workspace = true