diff --git a/extra/firefox-esr/checksums b/extra/firefox-esr/checksums
index 9aa1c460..cbc6c1c9 100644
--- a/extra/firefox-esr/checksums
+++ b/extra/firefox-esr/checksums
@@ -1,4 +1,4 @@
-1978eedd975b1cf95bd4a04b2381560d1ad9a4223032717f23fac26e3458a760
+51f54ff608aa09de07b304307581ae89112781597322b8999b3099cfabf48290
 f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e
 3dce6601b495f5b3d45b59f7d2492a340ee7e84b5beca17e48f862502bd5603f
 9b4c5c6bd57198abc4c846a1000603007f17e85577d861fd67ee11762a7c1c1b
diff --git a/extra/firefox-esr/sources b/extra/firefox-esr/sources
index 8893ee96..5ef5eeb2 100644
--- a/extra/firefox-esr/sources
+++ b/extra/firefox-esr/sources
@@ -1,4 +1,4 @@
-https://ftp.mozilla.org/pub/firefox/releases/78.4.1esr/source/firefox-78.4.1esr.source.tar.xz
+https://ftp.mozilla.org/pub/firefox/releases/78.5.0esr/source/firefox-78.5.0esr.source.tar.xz
 https://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz autoconf2.13/
 https://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz yasm/
 patches/no-dbus.patch
diff --git a/extra/firefox-esr/version b/extra/firefox-esr/version
index 50f93b6c..cc62a33e 100644
--- a/extra/firefox-esr/version
+++ b/extra/firefox-esr/version
@@ -1 +1 @@
-78.4.1esr 1
+78.5.0esr 1