diff --git a/interpreter/Cargo.toml b/interpreter/Cargo.toml
index 26b23e4..aec83bd 100644
--- a/interpreter/Cargo.toml
+++ b/interpreter/Cargo.toml
@@ -4,7 +4,7 @@ description = "An interpreter for the Common Expression Language (CEL)"
 repository = "https://github.com/clarkmcc/cel-rust"
 version = "0.8.0"
 authors = ["Tom Forbes <tom@tomforb.es>", "Clark McCauley <me@clarkmccauley.com>"]
-edition = "2018"
+edition = "2021"
 license = "MIT"
 categories = ["compilers"]
 
diff --git a/parser/Cargo.toml b/parser/Cargo.toml
index 6e552b5..a00af29 100644
--- a/parser/Cargo.toml
+++ b/parser/Cargo.toml
@@ -4,7 +4,7 @@ description = "A parser for the Common Expression Language (CEL)"
 repository = "https://github.com/clarkmcc/cel-rust"
 version = "0.7.0"
 authors = ["Tom Forbes <tom@tomforb.es>", "Clark McCauley <me@clarkmccauley.com>"]
-edition = "2018"
+edition = "2021"
 license = "MIT"
 categories = ["parsing"]