diff --git a/arrow-open-variant/Cargo.toml b/arrow-open-variant/Cargo.toml
index 6315470..674470c 100644
--- a/arrow-open-variant/Cargo.toml
+++ b/arrow-open-variant/Cargo.toml
@@ -8,6 +8,7 @@ license = "Apache-2.0"
 keywords = [""]
 categories = []
 repository = "https://github.com/datafusion-contrib/datafusion-functions-variant"
+rust-version = "1.60"
 
 [dependencies]
 arrow-array.workspace = true
diff --git a/open-variant/Cargo.toml b/open-variant/Cargo.toml
index de203c0..0c3a409 100644
--- a/open-variant/Cargo.toml
+++ b/open-variant/Cargo.toml
@@ -8,3 +8,4 @@ license = "Apache-2.0"
 keywords = [""]
 categories = []
 repository = "https://github.com/datafusion-contrib/datafusion-functions-variant"
+rust-version = "1.60"