diff --git a/Cargo.lock b/Cargo.lock
index eb5247b697..d6bd2e13e4 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -170,7 +170,7 @@ dependencies = [
  "chalk-macros",
  "chalk-rust-ir",
  "ena",
- "itertools",
+ "itertools 0.8.2",
  "petgraph",
  "rustc-hash",
 ]
@@ -520,6 +520,15 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "itoa"
 version = "0.4.5"
@@ -876,7 +885,7 @@ name = "ra_assists"
 version = "0.1.0"
 dependencies = [
  "format-buf",
- "itertools",
+ "itertools 0.9.0",
  "join_to_string",
  "ra_db",
  "ra_fmt",
@@ -928,7 +937,7 @@ dependencies = [
 name = "ra_fmt"
 version = "0.1.0"
 dependencies = [
- "itertools",
+ "itertools 0.9.0",
  "ra_syntax",
 ]
 
@@ -938,7 +947,7 @@ version = "0.1.0"
 dependencies = [
  "arrayvec",
  "either",
- "itertools",
+ "itertools 0.9.0",
  "log",
  "ra_db",
  "ra_hir_def",
@@ -1015,7 +1024,7 @@ dependencies = [
  "format-buf",
  "indexmap",
  "insta",
- "itertools",
+ "itertools 0.9.0",
  "join_to_string",
  "log",
  "ra_assists",
@@ -1101,7 +1110,7 @@ name = "ra_syntax"
 version = "0.1.0"
 dependencies = [
  "arrayvec",
- "itertools",
+ "itertools 0.9.0",
  "once_cell",
  "ra_parser",
  "ra_text_edit",
@@ -1278,7 +1287,7 @@ dependencies = [
  "crossbeam-channel",
  "env_logger",
  "globset",
- "itertools",
+ "itertools 0.9.0",
  "jod-thread",
  "log",
  "lsp-server",
diff --git a/crates/ra_assists/Cargo.toml b/crates/ra_assists/Cargo.toml
index 85adddb5bb..707746ad53 100644
--- a/crates/ra_assists/Cargo.toml
+++ b/crates/ra_assists/Cargo.toml
@@ -11,7 +11,7 @@ doctest = false
 format-buf = "1.0.0"
 join_to_string = "0.1.3"
 rustc-hash = "1.1.0"
-itertools = "0.8.2"
+itertools = "0.9.0"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_text_edit = { path = "../ra_text_edit" }
diff --git a/crates/ra_fmt/Cargo.toml b/crates/ra_fmt/Cargo.toml
index ea9befeaf4..e9d057afc0 100644
--- a/crates/ra_fmt/Cargo.toml
+++ b/crates/ra_fmt/Cargo.toml
@@ -9,6 +9,6 @@ publish = false
 doctest = false
 
 [dependencies]
-itertools = "0.8.2"
+itertools = "0.9.0"
 
 ra_syntax = { path = "../ra_syntax" }
diff --git a/crates/ra_hir/Cargo.toml b/crates/ra_hir/Cargo.toml
index 42193b4929..ba7b39a193 100644
--- a/crates/ra_hir/Cargo.toml
+++ b/crates/ra_hir/Cargo.toml
@@ -13,7 +13,7 @@ rustc-hash = "1.1.0"
 either = "1.5.3"
 arrayvec = "0.5.1"
 
-itertools = "0.8.2"
+itertools = "0.9.0"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_db = { path = "../ra_db" }
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index 7235c944c9..36eec0e60a 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -14,7 +14,7 @@ wasm = []
 either = "1.5.3"
 format-buf = "1.0.0"
 indexmap = "1.3.2"
-itertools = "0.8.2"
+itertools = "0.9.0"
 join_to_string = "0.1.3"
 log = "0.4.8"
 rustc-hash = "1.1.0"
diff --git a/crates/ra_syntax/Cargo.toml b/crates/ra_syntax/Cargo.toml
index 8efc6b368a..6fccc23038 100644
--- a/crates/ra_syntax/Cargo.toml
+++ b/crates/ra_syntax/Cargo.toml
@@ -11,7 +11,7 @@ repository = "https://github.com/rust-analyzer/rust-analyzer"
 doctest = false
 
 [dependencies]
-itertools = "0.8.2"
+itertools = "0.9.0"
 rowan = "0.9.1"
 rustc_lexer = "0.1.0"
 rustc-hash = "1.1.0"
diff --git a/crates/rust-analyzer/Cargo.toml b/crates/rust-analyzer/Cargo.toml
index d44f0ef1d6..e071e9b8d1 100644
--- a/crates/rust-analyzer/Cargo.toml
+++ b/crates/rust-analyzer/Cargo.toml
@@ -17,7 +17,7 @@ anyhow = "1.0.26"
 crossbeam-channel = "0.4.0"
 env_logger = { version = "0.7.1", default-features = false }
 globset = "0.4.4"
-itertools = "0.8.2"
+itertools = "0.9.0"
 jod-thread = "0.1.0"
 log = "0.4.8"
 lsp-types = { version = "0.73.0", features = ["proposed"] }