diff --git a/package_versions.txt b/package_versions.txt
index cc38165..4e76aa6 100644
--- a/package_versions.txt
+++ b/package_versions.txt
@@ -190,7 +190,7 @@ file-uri-to-path                                                              1.
 filelist                                                                      1.0.4                                               npm                         
 finalhandler                                                                  1.2.0                                               npm                         
 findutils                                                                     4.9.0-4                                             deb                         
-firefox-esr                                                                   115.8.0esr-1~deb12u1                                deb                         
+firefox-esr                                                                   115.9.0esr-1~deb12u1                                deb                         
 fontconfig                                                                    2.14.1-4                                            deb                         
 fontconfig-config                                                             2.14.1-4                                            deb                         
 fonts-dejavu-core                                                             2.37-6                                              deb