diff --git a/guix/build-system/r.scm b/guix/build-system/r.scm
index 664515d0ee..e7214155be 100644
--- a/guix/build-system/r.scm
+++ b/guix/build-system/r.scm
@@ -53,7 +53,7 @@ release corresponding to NAME and VERSION."
   (list (string-append "https://bioconductor.org/packages/release/bioc/src/contrib/"
                        name "_" version ".tar.gz")
         ;; TODO: use %bioconductor-version from (guix import cran)
-        (string-append "https://bioconductor.org/packages/3.8/bioc/src/contrib/Archive/"
+        (string-append "https://bioconductor.org/packages/3.9/bioc/src/contrib/Archive/"
                        name "_" version ".tar.gz")))
 
 (define %r-build-system-modules
diff --git a/guix/import/cran.scm b/guix/import/cran.scm
index b287be6941..f08ff61990 100644
--- a/guix/import/cran.scm
+++ b/guix/import/cran.scm
@@ -128,9 +128,9 @@ package definition."
 (define %cran-url "https://cran.r-project.org/web/packages/")
 (define %bioconductor-url "https://bioconductor.org/packages/")
 
-;; The latest Bioconductor release is 3.8.  Bioconductor packages should be
+;; The latest Bioconductor release is 3.9.  Bioconductor packages should be
 ;; updated together.
-(define %bioconductor-version "3.8")
+(define %bioconductor-version "3.9")
 
 (define %bioconductor-packages-list-url
   (string-append "https://bioconductor.org/packages/"