diff --git a/alloc_miri_test/Cargo.toml b/alloc_miri_test/Cargo.toml
index 8195800..2ec5b21 100644
--- a/alloc_miri_test/Cargo.toml
+++ b/alloc_miri_test/Cargo.toml
@@ -4,7 +4,7 @@ name = "alloc_miri_test"
 version = "0.0.0"
 autotests = false
 autobenches = false
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "alloc_miri_test"
diff --git a/core_miri_test/Cargo.toml b/core_miri_test/Cargo.toml
index e25c244..ab243d3 100644
--- a/core_miri_test/Cargo.toml
+++ b/core_miri_test/Cargo.toml
@@ -4,7 +4,7 @@ name = "core_miri_test"
 version = "0.0.0"
 autotests = false
 autobenches = false
-edition = "2018"
+edition = "2021"
 
 [lib]
 name = "core_miri_test"
diff --git a/rust-version b/rust-version
index b719abc..262e9c8 100644
--- a/rust-version
+++ b/rust-version
@@ -1 +1 @@
-nightly-2021-12-31
+nightly-2022-01-11