diff --git a/Cargo.lock b/Cargo.lock
index c10d72aa4c..872e66118a 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1043,7 +1043,6 @@ version = "0.1.0"
 dependencies = [
  "either",
  "format-buf",
- "fst",
  "indexmap",
  "insta",
  "itertools",
@@ -1060,11 +1059,8 @@ dependencies = [
  "ra_syntax",
  "ra_text_edit",
  "rand",
- "rayon",
  "rustc-hash",
- "superslice",
  "test_utils",
- "unicase",
 ]
 
 [[package]]
diff --git a/crates/ra_ide/Cargo.toml b/crates/ra_ide/Cargo.toml
index d50cf1d20a..97dea5ffde 100644
--- a/crates/ra_ide/Cargo.toml
+++ b/crates/ra_ide/Cargo.toml
@@ -17,11 +17,7 @@ indexmap = "1.3.0"
 itertools = "0.8.0"
 join_to_string = "0.1.3"
 log = "0.4.5"
-rayon = "1.0.2"
-fst = { version = "0.3.1", default-features = false }
 rustc-hash = "1.0"
-unicase = "2.2.0"
-superslice = "1.0.0"
 rand = { version = "0.7.0", features = ["small_rng"] }
 once_cell = "1.2.0"