diff --git a/Cargo.toml b/Cargo.toml
index 02b4ddea8e..72f385f9c7 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,7 @@ both threadsafe and memory safe and allows both reading and writing git
 repositories.
 """
 categories = ["api-bindings"]
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 url = "2.5.4"
diff --git a/git2-curl/Cargo.toml b/git2-curl/Cargo.toml
index 3ce384f3d3..2c5ca141e0 100644
--- a/git2-curl/Cargo.toml
+++ b/git2-curl/Cargo.toml
@@ -10,7 +10,7 @@ Backend for an HTTP transport in libgit2 powered by libcurl.
 
 Intended to be used with the git2 crate.
 """
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 curl = "0.4.33"
diff --git a/libgit2-sys/Cargo.toml b/libgit2-sys/Cargo.toml
index 2bbbd5338c..b2df3ca828 100644
--- a/libgit2-sys/Cargo.toml
+++ b/libgit2-sys/Cargo.toml
@@ -14,7 +14,7 @@ exclude = [
     "libgit2/fuzzers/*",
     "libgit2/tests/*",
 ]
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "libgit2_sys"
diff --git a/systest/Cargo.toml b/systest/Cargo.toml
index fe5cabcf23..708cda4303 100644
--- a/systest/Cargo.toml
+++ b/systest/Cargo.toml
@@ -3,7 +3,7 @@ name = "systest"
 version = "0.1.0"
 authors = ["Alex Crichton <alex@alexcrichton.com>"]
 build = "build.rs"
-edition = "2018"
+edition = "2021"
 
 [dependencies]
 libgit2-sys = { path = "../libgit2-sys", features = ['https', 'ssh'] }