diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index 8c84f0971..1a1cced74 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -41,10 +41,10 @@ jobs:
         uses: Swatinem/rust-cache@v2
       
       - name: Run tests
-        run: "LLVM_SYS_180_PREFIX=$LLVM_PATH cargo test --all --verbose"
+        run: "LLVM_SYS_181f_PREFIX=$LLVM_PATH cargo test --all --verbose"
 
       - name: Run clippy
-        run: "LLVM_SYS_180_PREFIX=$LLVM_PATH cargo clippy --all -- -D warnings"
+        run: "LLVM_SYS_181_PREFIX=$LLVM_PATH cargo clippy --all -- -D warnings"
 
       - name: Check formatting
         run: "cargo fmt --all -- --check"
diff --git a/compiler/hash-codegen-llvm/Cargo.toml b/compiler/hash-codegen-llvm/Cargo.toml
index 522f2780f..f006eb406 100644
--- a/compiler/hash-codegen-llvm/Cargo.toml
+++ b/compiler/hash-codegen-llvm/Cargo.toml
@@ -8,8 +8,8 @@ edition = "2021"
 doctest = false
 
 [dependencies]
-llvm-sys = "180.0.0"
-inkwell = { git = "https://github.com/hash-org/inkwell.git", branch="master", features = ["llvm18-0"] }
+llvm-sys = "181.1.0"
+inkwell = { git = "https://github.com/hash-org/inkwell.git", branch="llvm-18.1", features = ["llvm18-1"] }
 
 hash-attrs = { path = "../hash-attrs" }
 hash-codegen = {path = "../hash-codegen" }