diff --git a/support.toml b/support.toml
new file mode 100644
index 00000000..1faaa8be
--- /dev/null
+++ b/support.toml
@@ -0,0 +1,3 @@
+# Minimum supported version of the `rustsec` crate
+[rustsec]
+version = ">= 0.12"