diff --git a/gnu/packages/time.scm b/gnu/packages/time.scm
index bd211edf57..46e78c7ab7 100644
--- a/gnu/packages/time.scm
+++ b/gnu/packages/time.scm
@@ -348,7 +348,7 @@ business day calculation.")
 (define-public python-ciso8601
   (package
     (name "python-ciso8601")
-    (version "2.1.3")
+    (version "2.3.2")
     (source
      (origin
        (method git-fetch)
@@ -358,19 +358,17 @@ business day calculation.")
              (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
-        (base32
-         "0g1aiyc1ayh0rnibyy416m5mmck38ksgdm3jsy0z3rxgmgb24951"))))
-    (build-system python-build-system)
-    ;; Pytz should only be required for Python 2, but the test suite fails
-    ;; without it.
+        (base32 "189adk14ygs1cx3ncm1wqqfh18r72gl299zkllncynp1y79d0nd1"))))
+    (build-system pyproject-build-system)
     (native-inputs
-     (list python-pytz))
+     (list python-pytest
+           python-setuptools
+           python-wheel))
     (home-page "https://github.com/closeio/ciso8601")
-    (synopsis
-     "Fast ISO8601 date time parser")
+    (synopsis "Fast ISO8601 date time parser")
     (description
-     "The package ciso8601 converts ISO 8601 or RFC 3339 date time strings into
-Python datetime objects.")
+     "The package ciso8601 converts ISO 8601 or RFC 3339 date time strings
+into Python datetime objects.")
     (license expat)))
 
 (define-public python-relativetimebuilder