diff --git a/ccp4.xml b/ccp4.xml
index 897317a9af5ff98786346045e0d73e41e1d511f9..589fb3d5b862b118848fe4c58764a84199c2cbbe 100644
--- a/ccp4.xml
+++ b/ccp4.xml
@@ -2647,10 +2647,10 @@ install intltool libfontconfig1-dev libxrender-dev
       </if>
     </if>
     <branch repo="github-zip"
-            version="1.3.14"
+            version="1.4.0"
             module="MartinMalyMM/pairef/archive/refs/tags/${version}.zip"
             checkoutdir="pairef-${version}"
-            hash="sha256:327ac64083567c67af33bdbb737ef30079e48617bb3de6def2a0717a8d32227d">
+            hash="sha256:c2dd461f6a376bbdf5b86688a4bcf9ede9ea1a208d28f476c88255ccf70dfd22">
     </branch>
     <dependencies>
       <dep package="matplotlib"/>