diff --git a/lang/Cargo.toml b/lang/Cargo.toml
index 1b99a0000..5e77a7667 100644
--- a/lang/Cargo.toml
+++ b/lang/Cargo.toml
@@ -25,7 +25,7 @@ glsl-lang-types = "0.5.0"
 rserde = { version = "1.0", optional = true, features = ["derive"], package = "serde" }
 
 [build-dependencies]
-lalrpop = "0.19.9"
+lalrpop = "0.20.0"
 
 [dev-dependencies]
 lang-util-dev = "0.5.0"