diff --git a/Cargo.lock b/Cargo.lock
index f2ec461a..3e6406d0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -439,9 +439,9 @@ checksum = "7fb9b38af92608140b86b693604b9ffcc5824240a484d1ecd4795bacb2fe88f3"
 
 [[package]]
 name = "llvm-sys"
-version = "110.0.2"
+version = "120.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b7cc88ba864d592f52132ed3a19a97118fe16c92a63961f54b0ab7279c5407f"
+checksum = "b4a810627ac62b396f5fd2214ba9bbd8748d4d6efdc4d2c1c1303ea7a75763ce"
 dependencies = [
  "cc",
  "lazy_static",
diff --git a/flake.nix b/flake.nix
index d9398262..2c2b3f3c 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,8 +13,8 @@
             name = "nac3artiq";
             src = self;
             cargoSha256 = "0cml3irmc72f42dqmka9w4l3k397b2rnns768vm132mh2zyv85lp";
-            nativeBuildInputs = [ pkgs.python3 pkgs.llvm_11 ];
-            buildInputs = [ pkgs.python3 pkgs.libffi pkgs.libxml2 pkgs.llvm_11 ];
+            nativeBuildInputs = [ pkgs.python3 pkgs.llvm_12 ];
+            buildInputs = [ pkgs.python3 pkgs.libffi pkgs.libxml2 pkgs.llvm_12 ];
             cargoBuildFlags = [ "--package" "nac3artiq" ];
             cargoTestFlags = [ "--package" "nac3core" "--package" "nac3artiq" ];
             installPhase =
@@ -30,9 +30,9 @@
       devShell.x86_64-linux = pkgs.mkShell {
         name = "nac3-dev-shell";
         buildInputs = with pkgs; [
-          llvm_11
-          clang_11
-          lld_11
+          llvm_12
+          clang_12
+          lld_12
           cargo
           rustc
           libffi
diff --git a/nac3artiq/Cargo.toml b/nac3artiq/Cargo.toml
index a814fcdd..e73bbd31 100644
--- a/nac3artiq/Cargo.toml
+++ b/nac3artiq/Cargo.toml
@@ -11,6 +11,6 @@ crate-type = ["cdylib"]
 [dependencies]
 pyo3 = { version = "0.14", features = ["extension-module"] }
 rustpython-parser = { git = "https://github.com/m-labs/RustPython", branch = "parser-mod" }
-inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm11-0"] }
+inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm12-0"] }
 parking_lot = "0.11"
 nac3core = { path = "../nac3core" }
diff --git a/nac3core/Cargo.toml b/nac3core/Cargo.toml
index 68b7325b..6f2f730f 100644
--- a/nac3core/Cargo.toml
+++ b/nac3core/Cargo.toml
@@ -7,7 +7,7 @@ edition = "2018"
 [dependencies]
 num-bigint = "0.3"
 num-traits = "0.2"
-inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm11-0"] }
+inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm12-0"] }
 rustpython-parser = { git = "https://github.com/m-labs/RustPython", branch = "parser-mod" }
 itertools = "0.10.1"
 crossbeam = "0.8.1"
diff --git a/nac3standalone/Cargo.toml b/nac3standalone/Cargo.toml
index 5542d5f6..ed3ac1f3 100644
--- a/nac3standalone/Cargo.toml
+++ b/nac3standalone/Cargo.toml
@@ -5,7 +5,7 @@ authors = ["M-Labs"]
 edition = "2018"
 
 [dependencies]
-inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm11-0"] }
+inkwell = { git = "https://github.com/TheDan64/inkwell", branch = "master", features = ["llvm12-0"] }
 rustpython-parser = { git = "https://github.com/m-labs/RustPython", branch = "parser-mod" }
 parking_lot = "0.11.1"
 nac3core = { path = "../nac3core" }