diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index 1ce83beec4..152baf0c87 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -18945,14 +18945,14 @@ the combination of non-negative and non-positive constraints.")
 (define-public r-iso
   (package
     (name "r-iso")
-    (version "0.0-18.1")
+    (version "0.0-21")
     (source
      (origin
        (method url-fetch)
        (uri (cran-uri "Iso" version))
        (sha256
         (base32
-         "0vy6jdyvp751430sf2f690yhasjr70cpk3p3lnaaxjq3fs5gg99g"))))
+         "19lgwbfbca30mh3hhnarzab5cvnrwnr0pxam6fvfnadnqzhjm15n"))))
     (properties `((upstream-name . "Iso")))
     (build-system r-build-system)
     (native-inputs (list gfortran))