diff --git a/gnu/packages/gnuzilla.scm b/gnu/packages/gnuzilla.scm
index 4a9bf3ba04..1ffec770fa 100644
--- a/gnu/packages/gnuzilla.scm
+++ b/gnu/packages/gnuzilla.scm
@@ -523,9 +523,9 @@ variable defined below.  It requires guile-json to be installed."
 ;; XXXX: Workaround 'snippet' limitations.
 (define computed-origin-method (@@ (guix packages) computed-origin-method))
 
-(define %icecat-base-version "115.9.1")
+(define %icecat-base-version "115.10.0")
 (define %icecat-version (string-append %icecat-base-version "-guix0-preview1"))
-(define %icecat-build-id "20240323000000") ;must be of the form YYYYMMDDhhmmss
+(define %icecat-build-id "20240416000000") ;must be of the form YYYYMMDDhhmmss
 
 ;; 'icecat-source' is a "computed" origin that generates an IceCat tarball
 ;; from the corresponding upstream Firefox ESR tarball, using the 'makeicecat'
@@ -545,12 +545,12 @@ variable defined below.  It requires guile-json to be installed."
                   "firefox-" upstream-firefox-version ".source.tar.xz"))
             (sha256
              (base32
-              "0agr8s42lpbq5gixsgj5kpcvimbnyx6msr4il4rvmf7gpw47hr93"))))
+              "1wpf4vcrvnvhnfzqavbkzqbn51bds1l9f6ld4mzh9xwm7mrkrz8a"))))
 
          ;; The upstream-icecat-base-version may be older than the
          ;; %icecat-base-version.
-         (upstream-icecat-base-version "115.9.1")
-         (gnuzilla-commit "a59b8a2c2e4c8b8de47b3ae4d10032154a47a01e")
+         (upstream-icecat-base-version "115.10.0")
+         (gnuzilla-commit "40e114e5e8fd0b4d3621d6c8aebf0c78100578f2")
          (gnuzilla-source
           (origin
             (method git-fetch)
@@ -562,7 +562,7 @@ variable defined below.  It requires guile-json to be installed."
                                       (string-take gnuzilla-commit 8)))
             (sha256
              (base32
-              "0l07x59c0bmj72n0pdhb4mlphw9nmd88i9jg39xvxcw0cv7bw6qm"))))
+              "1x6miiafhv9ncddm7xxjz88amq9bpv6sqnw5k0yz6fy1ghw9ckw0"))))
 
          ;; 'search-patch' returns either a valid file name or #f, so wrap it
          ;; in 'assume-valid-file-name' to avoid 'local-file' warnings.