diff --git a/Dockerfile-assets/Pipfile b/Dockerfile-assets/Pipfile
index 3341b8d..0b345ca 100644
--- a/Dockerfile-assets/Pipfile
+++ b/Dockerfile-assets/Pipfile
@@ -6,7 +6,7 @@ name = "pypi"
 [packages]
 ipython = "*"
 biosimulators-utils = {version = ">=0.1.166", extras = ["bngl", "cellml", "escher", "lems", "logging", "neuroml", "sbml", "smoldyn"]}
-numpy = "<1.22.0" # because Assiumulo requires numpy < 1.22
+numpy = "<1.23.6" # because Assiumulo requires numpy < 1.22
 # AMICI
 amici = "<=0.11.21" # avoid latest version because this requires SymPy >= 1.9 and CBMPy can't handle this because it (a) no version > 1.9 is available and (b) CBMpy can't handle versions of SymPy that don't have microversion numbers
 biosimulators-amici = ">=0.1.22"