diff --git a/artiq-fast/conda/artiq-deps.nix b/artiq-fast/conda/artiq-deps.nix
index fe0fec1..f387ff2 100644
--- a/artiq-fast/conda/artiq-deps.nix
+++ b/artiq-fast/conda/artiq-deps.nix
@@ -1,16 +1,16 @@
 [
-  "python >=3.5.3"
+  "python"
   "llvmlite-artiq"
-  "binutils-or1k-linux >=2.27"
-  "pythonparser >=1.1"
+  "binutils-or1k-linux"
+  "pythonparser"
   "scipy"
   "numpy"
   "prettytable"
   "h5py"
   "python-dateutil"
-  "pyqt >=5.5"
+  "pyqt"
   "quamash"
-  "pyqtgraph 0.10.0"
+  "pyqtgraph"
   "pygit2"
   "python-levenshtein"
   "sipyco"