--- a/build/moz.configure/rust.configure
+++ b/build/moz.configure/rust.configure
@@ -168,7 +168,7 @@
         rustc_min_version = Version("1.47.0")
     else:
         rustc_min_version = Version(MINIMUM_RUST_VERSION)
-    cargo_min_version = rustc_min_version
+    cargo_min_version = Version("1.46.0")
 
     version = rustc_info.version
     is_nightly = "nightly" in version.version
