diff --git a/gnu/packages/bioinformatics.scm b/gnu/packages/bioinformatics.scm
index deee9efac3..5444f0a2a1 100644
--- a/gnu/packages/bioinformatics.scm
+++ b/gnu/packages/bioinformatics.scm
@@ -6947,7 +6947,7 @@ (define-public r-org-dm-eg-db
 (define-public r-org-mm-eg-db
   (package
     (name "r-org-mm-eg-db")
-    (version "3.3.0")
+    (version "3.4.0")
     (source (origin
               (method url-fetch)
               ;; We cannot use bioconductor-uri here because this tarball is
@@ -6957,7 +6957,7 @@ (define-public r-org-mm-eg-db
                                   "org.Mm.eg.db_" version ".tar.gz"))
               (sha256
                (base32
-                "0r939vfmsqqdwfimix1nv0bkhnixawy9c6avbclrncfanw3kgjax"))))
+                "1lykjqjaf01fmgg3cvfcvwd5xjq6zc5vbxnm5r4l32fzvl89q50c"))))
     (properties
      `((upstream-name . "org.Mm.eg.db")))
     (build-system r-build-system)