diff --git a/gnu/packages/cran.scm b/gnu/packages/cran.scm
index b95c981935774b03fec6d71817055fc2b9ca5c57..4ed6927d544266b58cc233ca1ed41b563061e446 100644
--- a/gnu/packages/cran.scm
+++ b/gnu/packages/cran.scm
@@ -10317,7 +10317,7 @@ (define-public r-tractor-base
        ("r-reportr" ,r-reportr)
        ("r-rnifti" ,r-rnifti)
        ("r-shades" ,r-shades)))
-    (home-page "http://www.tractor-mri.org.uk")
+    (home-page "https://www.tractor-mri.org.uk")
     (synopsis "Read, manipulate and visualize magnetic resonance images")
     (description
      "This package provides functions for working with magnetic resonance