diff --git a/testing/firefox/checksums b/testing/firefox/checksums
index 6d405d07..7733798f 100644
--- a/testing/firefox/checksums
+++ b/testing/firefox/checksums
@@ -1,4 +1,4 @@
-4fc186d3dc47df0dbc9268efda290ce4f6d1280508dcc4571e147eee6c5c0685  firefox-72.0b4.source.tar.xz
+0b3fe565ca5e8e74a2a86840ff1a629d5f41c96841db189515e8659a35fb41ce  firefox-72.0b5.source.tar.xz
 f0611136bee505811e9ca11ca7ac188ef5323a8e2ef19cffd3edb3cf08fd791e  autoconf-2.13.tar.gz
 b5e70b12cc9dd18fffd7924a7d3a2e11574136fe0764359d08eba0755f1c5d4c  mozconfig
 960d82bbfdc88c95f5cb4f2e1c1bf23dae7519b3b7203914d7b3ddbff1ba4c28  stab.h
diff --git a/testing/firefox/sources b/testing/firefox/sources
index 122a44c1..5e48e52a 100644
--- a/testing/firefox/sources
+++ b/testing/firefox/sources
@@ -1,4 +1,4 @@
-https://archive.mozilla.org/pub/firefox/releases/72.0b4/source/firefox-72.0b4.source.tar.xz
+https://archive.mozilla.org/pub/firefox/releases/72.0b5/source/firefox-72.0b5.source.tar.xz
 https://ftp.gnu.org/gnu/autoconf/autoconf-2.13.tar.gz autoconf2.13/
 files/mozconfig
 files/stab.h toolkit/crashreporter/google-breakpad/src/
diff --git a/testing/firefox/version b/testing/firefox/version
index c6017cbd..0c33a986 100644
--- a/testing/firefox/version
+++ b/testing/firefox/version
@@ -1 +1 @@
-72.0b4 1
+72.0b5 1