diff --git a/Cargo.lock b/Cargo.lock
index 4ad436b2c9..316dae053f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1039,7 +1039,6 @@ dependencies = [
  "itertools",
  "join_to_string",
  "log",
- "once_cell",
  "ra_assists",
  "ra_cfg",
  "ra_db",
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index adee7c493c..410d8de624 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -19,8 +19,6 @@ join_to_string = "0.1.3"
 log = "0.4.8"
 rustc-hash = "1.1.0"
 rand = { version = "0.7.3", features = ["small_rng"] }
-# TODO: check if can remove
-once_cell = "1.3.1"
 
 ra_syntax = { path = "../ra_syntax" }
 ra_text_edit = { path = "../ra_text_edit" }