diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index d09416f3..943eaf15 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -31,8 +31,6 @@ jobs:
 
       - name: Install Foundry
         uses: foundry-rs/foundry-toolchain@v1
-        with:
-          version: "nightly-3e962e2efe17396886fcb1fd141ccf4204cd3a21"
 
       - name: Test backend
         env:
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index eec1ddec..9f4c7d35 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -13,7 +13,7 @@ futures = "0.3.28"
 num-bigint = "0.4.3"
 serde = { version = "1.0.166", features = ["derive"] }
 snark-verifier-sdk = { git = "https://github.com/privacy-scaling-explorations/snark-verifier", version = "0.1.1" }
-ethers = { version = "2.0.7", default-features = false, features = ["ethers-solc"] }
+ethers = { version = "2.0.7", default-features = false, features = ["ethers-solc", "legacy"] }
 reqwest = { version = "0.11", features = ["json"] }
 serde_json = "1.0.64"
 tokio = { version = "1.7.1", features = ["full"] }
@@ -21,4 +21,4 @@ base64 = "0.13"
 bincode = "1.3.3"
 
 [build-dependencies]
-ethers = { version = "2.0.7", default-features = false, features = ["ethers-solc"] }
+ethers = { version = "2.0.7", default-features = false, features = ["ethers-solc", "legacy"] }