diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 006290f934..fc97d2b7f7 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -4758,14 +4758,14 @@ without using the configuration machinery.")
 (define-public python-jupyter-core
   (package
     (name "python-jupyter-core")
-    (version "4.2.0")
+    (version "4.2.1")
     (source
      (origin
        (method url-fetch)
        (uri (string-append (pypi-uri "jupyter_core" version)))
        (sha256
         (base32
-         "177d9csqldzhsh6xs1p4nf6lzvhzyg6gklqjf69lxgxyadx87v24"))))
+         "1cy7inv218dgh4m1fbzbsiqpz733ylgjrj62jxqpfzs3r2cm7ic9"))))
     (build-system python-build-system)
     ;; FIXME: not sure how to run the tests
     (arguments `(#:tests? #f))