diff --git a/Cargo.lock b/Cargo.lock
index ca5c677..069dce3 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -66,9 +66,9 @@ checksum = "d7ce14664caf5b27f5656ff727defd68ae1eb75ef3c4d95259361df1eb376bef"
 
 [[package]]
 name = "regex"
-version = "1.5.4"
+version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d07a8629359eb56f1e2fb1652bb04212c072a87ba68546a04065d525673ac461"
+checksum = "4c4eb3267174b8c6c2f654116623910a0fef09c4753f8dd83db29c48a0df988b"
 dependencies = [
  "aho-corasick",
  "memchr",
@@ -77,9 +77,9 @@ dependencies = [
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.25"
+version = "0.6.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
+checksum = "a3f87b73ce11b1619a3c6332f45341e0047173771e8b8b73f87bfeefb7b56244"
 
 [[package]]
 name = "rustc-serialize"
@@ -95,6 +95,6 @@ checksum = "558dc50e1a5a5fa7112ca2ce4effcb321b0300c0d4ccf0776a9f60cd89031171"
 
 [[package]]
 name = "unicode-segmentation"
-version = "1.8.0"
+version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8895849a949e7845e06bd6dc1aa51731a103c42707010a5b591c0038fb73385b"
+checksum = "7e8820f5d777f6224dc4be3632222971ac30164d4a258d595640799554ebfd99"
diff --git a/Cargo.toml b/Cargo.toml
index a04f1c9..9797e9e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -3,7 +3,7 @@ name = "cpc"
 version = "1.8.0"
 description = "evaluates math expressions, with support for units and conversion between units"
 authors = ["Kasper Henningsen"]
-edition = "2018"
+edition = "2021"
 readme = "README.md"
 license = "MIT"
 homepage = "https://github.com/probablykasper/cpc#readme"
@@ -13,8 +13,8 @@ keywords = ["math", "expression", "evaluate", "units", "convert"]
 categories = ["mathematics", "science", "parsing", "text-processing", "value-formatting"]
 
 [dependencies]
-decimal = "2.1.0"
-unicode-segmentation = "1.8.0"
+decimal = "2.1"
+unicode-segmentation = "1.9"
 
 [dev-dependencies]
-regex = "1.5.4"
+regex = "1.6"