diff --git a/Cargo.toml b/Cargo.toml
index 0c169d9a91..9ef3860d9f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,7 +15,8 @@ resolver = "2"
 all-features = true
 
 [dependencies]
-bitflags = "1"
+# bitflags 1.3 requires Rust-1.46
+bitflags = "~1.2"
 bit-set = "0.5"
 codespan-reporting = { version = "0.11.0", optional = true }
 fxhash = "0.2"