diff --git a/Cargo.lock b/Cargo.lock
index 1dedf977210..d7ec266c0b3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1135,7 +1135,7 @@ dependencies = [
  "ra_syntax 0.1.0",
  "ra_tt 0.1.0",
  "rustc-hash 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "test_utils 0.1.0",
 ]
 
@@ -1603,6 +1603,11 @@ dependencies = [
  "maybe-uninit 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "smallvec"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "smol_str"
 version = "0.1.15"
@@ -2007,6 +2012,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum serde_yaml 0.8.11 (registry+https://github.com/rust-lang/crates.io-index)" = "691b17f19fc1ec9d94ec0b5864859290dff279dbd7b03f017afda54eb36c3c35"
 "checksum slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 "checksum smallvec 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)" = "f7b0758c52e15a8b5e3691eae6cc559f08eee9406e548a4477ba4e67770a82b6"
+"checksum smallvec 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4ecf3b85f68e8abaa7555aa5abdb1153079387e60b718283d732f03897fcfc86"
 "checksum smol_str 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "34836c9a295c62c2ce3514471117c5cb269891e8421b2aafdd910050576c4d8b"
 "checksum stacker 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "d96fc4f13a0ac088e9a3cd9af1cc8c5cc1ab5deb2145cef661267dfc9c542f8a"
 "checksum superslice 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ab16ced94dbd8a46c82fd81e3ed9a8727dac2977ea869d217bcc4ea1f122e81f"
diff --git a/crates/ra_mbe/Cargo.toml b/crates/ra_mbe/Cargo.toml
index e8ef2457bb9..b02e45ee39d 100644
--- a/crates/ra_mbe/Cargo.toml
+++ b/crates/ra_mbe/Cargo.toml
@@ -9,7 +9,7 @@ ra_syntax = { path = "../ra_syntax" }
 ra_parser = { path = "../ra_parser" }
 tt = { path = "../ra_tt", package = "ra_tt" }
 rustc-hash = "1.0.0"
-smallvec = "0.6.9"
+smallvec = "1.0.0"
 log = "0.4.5"
 
 [dev-dependencies]