diff --git a/gnu/packages/astronomy.scm b/gnu/packages/astronomy.scm
index efd70f5500..d6bda35700 100644
--- a/gnu/packages/astronomy.scm
+++ b/gnu/packages/astronomy.scm
@@ -4567,13 +4567,13 @@ install an implementation package such as gwcs.")
 (define-public python-gwcs
   (package
     (name "python-gwcs")
-    (version "0.20.0")
+    (version "0.21.0")
     (source
      (origin
        (method url-fetch)
        (uri (pypi-uri "gwcs" version))
        (sha256
-        (base32 "1vhvs0mcwrw0128q9pd9v21wl173lspj5rvygqr19ljncralbx73"))))
+        (base32 "1fn5l4v236bl7xqi1is40c2q57dji8by98iwqcndfnmjwqf7zllc"))))
     (build-system pyproject-build-system)
     (native-inputs
      (list python-jsonschema