diff --git a/.github/workflows/ci-contracts-upload-binaries.yml b/.github/workflows/ci-contracts-upload-binaries.yml
index d2d3c52a40..0e474112d5 100644
--- a/.github/workflows/ci-contracts-upload-binaries.yml
+++ b/.github/workflows/ci-contracts-upload-binaries.yml
@@ -31,7 +31,7 @@ jobs:
       - name: Install Rust stable
         uses: actions-rs/toolchain@v1
         with:
-          toolchain: 1.86
+          toolchain: 1.77
           target: wasm32-unknown-unknown
           override: true