diff --git a/Cargo.lock b/Cargo.lock
index 071bd90..8ac6248 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,99 +1,39 @@
-[[package]]
-name = "aho-corasick"
-version = "0.6.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "cfg-if"
-version = "0.1.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
 [[package]]
 name = "lazy_static"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca488b89a5657b0a2ecd45b95609b3e848cf1755da332a0da46e2b2b1cb371a7"
 dependencies = [
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "libc"
-version = "0.2.43"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "memchr"
-version = "2.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)",
- "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "version_check",
 ]
 
 [[package]]
 name = "regex"
-version = "1.0.5"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8963b85b8ce3074fecffde43b4b0dded83ce2f367dc8d363afc56679f3ee820b"
 dependencies = [
- "aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)",
- "memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex-syntax",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.2"
+version = "0.6.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
-]
+checksum = "8cab7a364d15cde1e505267766a2d3c4e22a843e1a601f0fa7564c0f82ced11c"
 
 [[package]]
 name = "sanitize-filename"
-version = "0.2.0"
-dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "thread_local"
-version = "0.3.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
+version = "0.2.1"
 dependencies = [
- "lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static",
+ "regex",
 ]
 
-[[package]]
-name = "ucd-util"
-version = "0.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "utf8-ranges"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "version_check"
 version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[metadata]
-"checksum aho-corasick 0.6.8 (registry+https://github.com/rust-lang/crates.io-index)" = "68f56c7353e5a9547cbd76ed90f7bb5ffc3ba09d4ea9bd1d8c06c8b1142eeb5a"
-"checksum cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "082bb9b28e00d3c9d39cc03e64ce4cea0f1bb9b3fde493f0cbc008472d22bdf4"
-"checksum lazy_static 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ca488b89a5657b0a2ecd45b95609b3e848cf1755da332a0da46e2b2b1cb371a7"
-"checksum libc 0.2.43 (registry+https://github.com/rust-lang/crates.io-index)" = "76e3a3ef172f1a0b9a9ff0dd1491ae5e6c948b94479a3021819ba7d860c8645d"
-"checksum memchr 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "4b3629fe9fdbff6daa6c33b90f7c08355c1aca05a3d01fa8063b822fcf185f3b"
-"checksum regex 1.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "2069749032ea3ec200ca51e4a31df41759190a88edca0d2d86ee8bedf7073341"
-"checksum regex-syntax 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)" = "747ba3b235651f6e2f67dfa8bcdcd073ddb7c243cb21c442fc12395dfcac212d"
-"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
-"checksum ucd-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd2be2d6639d0f8fe6cdda291ad456e23629558d466e2789d2c3e9892bda285d"
-"checksum utf8-ranges 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "fd70f467df6810094968e2fce0ee1bd0e87157aceb026a8c083bcf5e25b9efe4"
-"checksum version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
+checksum = "914b1a6776c4c929a602fafd8bc742e06365d4bcbe48c30f9cca5824f70dc9dd"
diff --git a/Cargo.toml b/Cargo.toml
index 09821c5..a5d135a 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,4 +10,4 @@ description = "A simple filename sanitizer, based on Node's sanitize-filename"
 
 [dependencies]
 lazy_static = "1.1.0"
-regex = "1.0.5"
+regex = { version = "1.4.1", default-features = false, features = ["std", "unicode-case"] }