diff --git a/flake.nix b/flake.nix
index edcee7540..859a0b0b7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -124,7 +124,7 @@
 
         nativeBuildInputs = [ pkgs.qt5.wrapQtAppsHook ];
         # keep llvm_x and lld_x in sync with llvmlite
-        propagatedBuildInputs = [ pkgs.llvm_11 pkgs.lld_14 sipyco.packages.x86_64-linux.sipyco pythonparser pkgs.qt5.qtsvg artiq-comtools.packages.x86_64-linux.artiq-comtools ]
+        propagatedBuildInputs = [ pkgs.llvm_14 pkgs.lld_14 sipyco.packages.x86_64-linux.sipyco pythonparser pkgs.qt5.qtsvg artiq-comtools.packages.x86_64-linux.artiq-comtools ]
           ++ (with pkgs.python3Packages; [ llvmlite pyqtgraph pygit2 numpy dateutil scipy prettytable pyserial levenshtein h5py pyqt5 qasync tqdm lmdb jsonschema ]);
 
         dontWrapQtApps = true;
@@ -147,10 +147,10 @@
           "--set FONTCONFIG_FILE ${pkgs.fontconfig.out}/etc/fonts/fonts.conf"
         ];
 
-        # FIXME: automatically propagate lld_14 llvm_11 dependencies
+        # FIXME: automatically propagate lld_14 llvm_14 dependencies
         # cacert is required in the check stage only, as certificates are to be
         # obtained from system elsewhere
-        nativeCheckInputs = [ pkgs.lld_14 pkgs.llvm_11 libartiq-support pkgs.lit outputcheck pkgs.cacert ];
+        nativeCheckInputs = [ pkgs.lld_14 pkgs.llvm_14 libartiq-support pkgs.lit outputcheck pkgs.cacert ];
         checkPhase = ''
           python -m unittest discover -v artiq.test
 
@@ -228,7 +228,7 @@
             rust
             pkgs.cargo-xbuild
             pkgs.llvmPackages_11.clang-unwrapped
-            pkgs.llvm_11
+            pkgs.llvm_14
             pkgs.lld_14
             vivado
             rustPlatform.cargoSetupHook
@@ -391,7 +391,7 @@
           rust
           pkgs.cargo-xbuild
           pkgs.llvmPackages_11.clang-unwrapped
-          pkgs.llvm_11
+          pkgs.llvm_14
           pkgs.lld_14
           # To manually run compiler tests:
           pkgs.lit
@@ -419,7 +419,7 @@
           rust
           pkgs.cargo-xbuild
           pkgs.llvmPackages_11.clang-unwrapped
-          pkgs.llvm_11
+          pkgs.llvm_14
           pkgs.lld_14
           packages.x86_64-linux.vivado
           packages.x86_64-linux.openocd-bscanspi
@@ -453,7 +453,7 @@
 
           buildInputs = [
             (pkgs.python3.withPackages(ps: with packages.x86_64-linux; [ artiq ps.paramiko ]))
-            pkgs.llvm_11
+            pkgs.llvm_14
             pkgs.lld_14
             pkgs.openssh
             packages.x86_64-linux.openocd-bscanspi  # for the bscanspi bitstreams