diff --git a/nongnu/packages/mozilla.scm b/nongnu/packages/mozilla.scm
index 4a18ed9..b9384d8 100644
--- a/nongnu/packages/mozilla.scm
+++ b/nongnu/packages/mozilla.scm
@@ -249,19 +249,19 @@ according to Unicode Standard Annex #31")
 
 ;; Update this id with every firefox update to it's release date.
 ;; It's used for cache validation and therefor can lead to strange bugs.
-(define %firefox-esr-build-id "20230214000000")
+(define %firefox-esr-build-id "20230313000000")
 
 (define-public firefox-esr
   (package
     (name "firefox-esr")
-    (version "102.8.0esr")
+    (version "102.9.0esr")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://archive.mozilla.org/pub/firefox/releases/"
                            version "/source/firefox-" version ".source.tar.xz"))
        (sha256
-        (base32 "0j6afrgfsmd0adbbmffw4p1f2hznpck9d36z3bsjx36f7cjgdy27"))))
+        (base32 "1l8xlbba8sa9dg132k96ch8mz97i5lyhpvkxi8d85jh97xi79c1i"))))
     (build-system gnu-build-system)
     (arguments
      (list