diff --git a/Cargo.lock b/Cargo.lock
index aff0178..64f80a0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3,7 +3,7 @@ name = "xxcalc"
 version = "0.2.1"
 dependencies = [
  "rustyline 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "smallvec 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "smallvec 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -54,7 +54,7 @@ dependencies = [
 
 [[package]]
 name = "smallvec"
-version = "0.2.1"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -79,7 +79,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 "checksum libc 0.2.17 (registry+https://github.com/rust-lang/crates.io-index)" = "044d1360593a78f5c8e5e710beccdc24ab71d1f01bc19a29bcacdba22e8475d8"
 "checksum nix 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "bfb3ddedaa14746434a02041940495bf11325c22f6d36125d3bdd56090d50a79"
 "checksum rustyline 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "00b06ac9c8e8e3e83b33d175d39a9f7b6c2c930c82990593719c8e48788ae2d9"
-"checksum smallvec 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "4c8cbcd6df1e117c2210e13ab5109635ad68a929fcbb8964dc965b76cb5ee013"
+"checksum smallvec 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "3a3c84984c278afe61a46e19868e8b23e2ee3be5b3cc6dea6edad4893bc6c841"
 "checksum unicode-width 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2d6722facc10989f63ee0e20a83cd4e1714a9ae11529403ac7e0afd069abc39e"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
diff --git a/Cargo.toml b/Cargo.toml
index 2ffbe4a..602b5b3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ doc = false
 
 [dependencies]
 rustyline = { version = "1.0.0", optional = true }
-smallvec = "0.2.1"
+smallvec = "0.3.1"
 
 [profile.release]
 lto = true