diff --git a/Cargo.lock b/Cargo.lock
index a52978cedc..2a8ef7ef37 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1831,9 +1831,9 @@ checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
 
 [[package]]
 name = "ungrammar"
-version = "1.12.1"
+version = "1.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e60bc224c274d24dc2b112b501bed6ec98e28cd39916b7020cd430d2ed0394ea"
+checksum = "84c629795d377049f2a1dc5f42cf505dc5ba8b28a5df0a03f4183a24480e4a6a"
 
 [[package]]
 name = "unicase"
diff --git a/xtask/Cargo.toml b/xtask/Cargo.toml
index 4e6b439fd6..b379797f98 100644
--- a/xtask/Cargo.toml
+++ b/xtask/Cargo.toml
@@ -15,7 +15,7 @@ flate2 = "1.0"
 pico-args = "0.4.0"
 proc-macro2 = "1.0.8"
 quote = "1.0.2"
-ungrammar = "1.9"
+ungrammar = "=1.11"
 walkdir = "2.3.1"
 write-json = "0.1.0"
 xshell = "0.1"