diff --git a/artiq-fast/conda/artiq.nix b/artiq-fast/conda/artiq.nix
index ab21777..4b07e00 100644
--- a/artiq-fast/conda/artiq.nix
+++ b/artiq-fast/conda/artiq.nix
@@ -21,6 +21,7 @@ let
       "pygit2"
       "python-levenshtein"
       "sipyco"
+      "jsonschema"
     ];
     extraYaml =
     ''
diff --git a/artiq-fast/pkgs/artiq.nix b/artiq-fast/pkgs/artiq.nix
index 78be5a0..49d0dc2 100644
--- a/artiq-fast/pkgs/artiq.nix
+++ b/artiq-fast/pkgs/artiq.nix
@@ -11,7 +11,7 @@ python3Packages.buildPythonPackage rec {
   propagatedBuildInputs = [ binutils-or1k llvm-or1k llvmlite-artiq ]
     ++ (lib.lists.optionals (lib.strings.versionAtLeast version "6.0") [ binutils-arm ])
     ++ (with pythonDeps; [ sipyco pyqtgraph-qt5 pythonparser ])
-    ++ (with python3Packages; [ pygit2 numpy dateutil scipy prettytable pyserial python-Levenshtein h5py pyqt5 ])
+    ++ (with python3Packages; [ pygit2 numpy dateutil jsonschema scipy prettytable pyserial python-Levenshtein h5py pyqt5 ])
     ++ [(if (lib.strings.versionAtLeast version "6.0") then pythonDeps.qasync else python3Packages.quamash)];
 
   dontWrapQtApps = true;