diff --git a/nongnu/packages/mozilla.scm b/nongnu/packages/mozilla.scm
index 09f050e..5de742b 100644
--- a/nongnu/packages/mozilla.scm
+++ b/nongnu/packages/mozilla.scm
@@ -248,19 +248,19 @@ 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 "20221115000000")
+(define %firefox-esr-build-id "20221213000000")
 
 (define-public firefox-esr
   (package
     (name "firefox-esr")
-    (version "102.5.0esr")
+    (version "102.6.0esr")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://archive.mozilla.org/pub/firefox/releases/"
                            version "/source/firefox-" version ".source.tar.xz"))
        (sha256
-        (base32 "1n2pq165fxmvgcr5mv3hhaid2vn7lh3jg03lf13kz4c5295x8z81"))))
+        (base32 "1zhggzrk7lgip8jm37idh22qks76kmjy4yqy2qi63mvnv2j58cfj"))))
     (build-system gnu-build-system)
     (arguments
      (list