diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 5e20e449d4..f2b26ced43 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.78.0"
+channel = "1.77.2"
 targets = ["wasm32-unknown-unknown"]