diff --git a/pkgs/applications/office/libreoffice/default.nix b/pkgs/applications/office/libreoffice/default.nix
index 8b063ad6c70e..d5d48219beb7 100644
--- a/pkgs/applications/office/libreoffice/default.nix
+++ b/pkgs/applications/office/libreoffice/default.nix
@@ -200,9 +200,8 @@ let
       }) // {
         inherit (x) md5name md5;
       }) srcsAttributes.deps;
-  } // optionalAttrs (variant != "collabora") {
-    translations = fetchurl srcsAttributes.translations;
-    help = fetchurl srcsAttributes.help;
+    translations = srcsAttributes.translations { inherit fetchurl fetchgit; };
+    help = srcsAttributes.help { inherit fetchurl fetchgit; };
   };
 
   qtMajor = lib.versions.major qtbase.version;
@@ -235,14 +234,17 @@ in stdenv.mkDerivation (finalAttrs: {
       ln -sfv ${f} $sourceRoot/${tarballPath}/${f.md5name}
       ln -sfv ${f} $sourceRoot/${tarballPath}/${f.name}
     '')}
-  '' + optionalString (variant != "collabora") ''
 
+  '' + (if (variant != "collabora") then ''
     ln -sv ${srcs.help} $sourceRoot/${tarballPath}/${srcs.help.name}
     ln -svf ${srcs.translations} $sourceRoot/${tarballPath}/${srcs.translations.name}
 
     tar -xf ${srcs.help}
     tar -xf ${srcs.translations}
-  '';
+  '' else ''
+    cp -r --no-preserve=mode ${srcs.help}/. $sourceRoot/helpcontent2/
+    cp -r --no-preserve=mode ${srcs.translations}/. $sourceRoot/translations/
+  '');
 
   patches = [
     # Skip some broken tests:
diff --git a/pkgs/applications/office/libreoffice/src-collabora/help.nix b/pkgs/applications/office/libreoffice/src-collabora/help.nix
new file mode 100644
index 000000000000..fc5d4a3fa2a0
--- /dev/null
+++ b/pkgs/applications/office/libreoffice/src-collabora/help.nix
@@ -0,0 +1,6 @@
+{ fetchgit, ... }:
+fetchgit {
+  url = "https://gerrit.libreoffice.org/help";
+  rev = "27f62cdb52fe23f6090a3249fcd1433777b2598d";
+  hash = "sha256-lyBuj7FI1jwVLLBkB6JJcmQVtm1FKExYWvRUoGqRbJ0=";
+}
diff --git a/pkgs/applications/office/libreoffice/src-collabora/main.nix b/pkgs/applications/office/libreoffice/src-collabora/main.nix
index 7e4bf5f4fdd0..ef4d5d77bfc1 100644
--- a/pkgs/applications/office/libreoffice/src-collabora/main.nix
+++ b/pkgs/applications/office/libreoffice/src-collabora/main.nix
@@ -2,6 +2,6 @@
 fetchgit {
   url = "https://gerrit.libreoffice.org/core";
   rev = "refs/tags/cp-24.04.5-4";
-  hash = "sha256-27uLK1u8XWNigxZUCUu8nNZP3p5eFUsS2gCcfSYJK2k=";
-  fetchSubmodules = true;
+  hash = "sha256-OJ3R8qs8/R8QnXGCRgn/ZJK7Nn8cWwYbZxjEWg0VpBc=";
+  fetchSubmodules = false;
 }
diff --git a/pkgs/applications/office/libreoffice/src-collabora/translations.nix b/pkgs/applications/office/libreoffice/src-collabora/translations.nix
new file mode 100644
index 000000000000..06f5fe5a3624
--- /dev/null
+++ b/pkgs/applications/office/libreoffice/src-collabora/translations.nix
@@ -0,0 +1,6 @@
+{ fetchgit, ... }:
+fetchgit {
+  url = "https://gerrit.libreoffice.org/translations";
+  rev = "5fd34a953e6861cb8e392363c0a3500059ed6b01";
+  hash = "sha256-1j0kTvPbytsCWszXz+xFE+n53zPkR8gNgVaawn+rjfI=";
+}
diff --git a/pkgs/applications/office/libreoffice/src-fresh/help.nix b/pkgs/applications/office/libreoffice/src-fresh/help.nix
index 164121f06165..0f9f54905270 100644
--- a/pkgs/applications/office/libreoffice/src-fresh/help.nix
+++ b/pkgs/applications/office/libreoffice/src-fresh/help.nix
@@ -1,4 +1,5 @@
-{
+{ fetchurl, ... }:
+fetchurl {
   sha256 = "090pi8dnj5izpvng94hgmjid14n7xvy3rlqqvang3pqdn35xnpsl";
   url = "https://download.documentfoundation.org/libreoffice/src/24.2.5/libreoffice-help-24.2.5.2.tar.xz";
 }
diff --git a/pkgs/applications/office/libreoffice/src-fresh/translations.nix b/pkgs/applications/office/libreoffice/src-fresh/translations.nix
index 82291fab8326..b96943060182 100644
--- a/pkgs/applications/office/libreoffice/src-fresh/translations.nix
+++ b/pkgs/applications/office/libreoffice/src-fresh/translations.nix
@@ -1,4 +1,5 @@
-{
+{ fetchurl, ... }:
+fetchurl {
   sha256 = "0fri41y59zhm8lq0kh6hvf5rpdjdqx0lg1sl40mhh1d6lf1izc1w";
   url = "https://download.documentfoundation.org/libreoffice/src/24.2.5/libreoffice-translations-24.2.5.2.tar.xz";
 }
diff --git a/pkgs/applications/office/libreoffice/src-still/help.nix b/pkgs/applications/office/libreoffice/src-still/help.nix
index f9e71ea79936..8bdc4617e148 100644
--- a/pkgs/applications/office/libreoffice/src-still/help.nix
+++ b/pkgs/applications/office/libreoffice/src-still/help.nix
@@ -1,4 +1,5 @@
-{
+{ fetchurl, ... }:
+fetchurl {
   sha256 = "1l543k603mbr3rnwlnv9j52mblmvkgj9y49w4v7w3xm8b15331rs";
   url = "https://download.documentfoundation.org/libreoffice/src/7.6.7/libreoffice-help-7.6.7.2.tar.xz";
 }
diff --git a/pkgs/applications/office/libreoffice/src-still/translations.nix b/pkgs/applications/office/libreoffice/src-still/translations.nix
index 9604ad622e21..fffb89108f09 100644
--- a/pkgs/applications/office/libreoffice/src-still/translations.nix
+++ b/pkgs/applications/office/libreoffice/src-still/translations.nix
@@ -1,4 +1,5 @@
-{
+{ fetchurl, ... }:
+fetchurl {
   sha256 = "1bzmpa04bv8afhl3p68dlicamh0zyckmbdgqb3v72fjmx2h8i64a";
   url = "https://download.documentfoundation.org/libreoffice/src/7.6.7/libreoffice-translations-7.6.7.2.tar.xz";
 }
diff --git a/pkgs/applications/office/libreoffice/update.sh b/pkgs/applications/office/libreoffice/update.sh
index 6f9612dd7090..9f7a580ad56e 100755
--- a/pkgs/applications/office/libreoffice/update.sh
+++ b/pkgs/applications/office/libreoffice/update.sh
@@ -47,7 +47,8 @@ case $variant in
     echo \"$full_version\" > version.nix
 
     for t in help translations; do
-        echo "{" > $t.nix
+        echo "{ fetchurl, ... }:" > $t.nix
+        echo "fetchurl {" >> $t.nix
         echo "  sha256 = "\"$(nix-prefetch-url $baseurl/libreoffice-$t-$full_version.tar.xz)'";' >> $t.nix
         echo "  url = "\"$baseurl/libreoffice-$t-$full_version.tar.xz'";' >> $t.nix
         echo "}" >> $t.nix
@@ -56,7 +57,7 @@ case $variant in
     # Out of loop nix-prefetch-url, because there is no $t, and we want the output
     # path as well, to get the download.lst file from there afterwards.
     main_path_hash=($(nix-prefetch-url --print-path $baseurl/libreoffice-$full_version.tar.xz))
-    echo "{ fetchurl, ...}:" > main.nix
+    echo "{ fetchurl, ... }:" > main.nix
     echo "fetchurl {" >> main.nix
     echo "  sha256 = "\"${main_path_hash[0]}'";' >> main.nix
     echo "  url = "\"$baseurl/libreoffice-$full_version.tar.xz'";' >> main.nix
@@ -78,27 +79,41 @@ case $variant in
     ;;
 
 (collabora)
-    full_version=$(git ls-remote --tags --sort -v:refname https://gerrit.libreoffice.org/core | grep -Pom1 'refs/tags/cp-\K\d+\.\d+\.\d+-\d+$')
+    all_tags=$(git ls-remote --tags --sort -v:refname https://gerrit.libreoffice.org/core)
+    rev=$(grep --perl-regexp --only-matching --max-count=1 \
+        '\Krefs/tags/cp-\d+\.\d+\.\d+-\d+$' <<< "$all_tags")
+    full_version=${rev#refs/tags/cp-}
     echoerr full version is $full_version
     echo \"$full_version\" > version.nix
 
-    rev="refs/tags/cp-$full_version"
+    # The full checkout including the submodules is too big for Hydra, so we fetch
+    # submodules separately.
+    declare -A dirnames=([help]=helpcontent2 [translations]=translations)
+    for t in help translations; do
+        sub_rev=$(curl --silent "https://git.libreoffice.org/core/+/$rev/${dirnames[$t]}" |\
+            pup '.gitlink-detail text{}' |\
+            sed -n 's/^Submodule link to \([0-9a-f]\{40\}\) of .*/\1/p')
+        echoerr got rev $sub_rev for $t
+        prefetch_output=$(nix-prefetch-git "https://gerrit.libreoffice.org/$t" --rev "$sub_rev")
+        echo "{ fetchgit, ... }:" > $t.nix
+        echo "fetchgit {" >> $t.nix
+        echo "  url = \"$(jq -r '.url' <<< "$prefetch_output")\";" >> $t.nix
+        echo "  rev = \"$rev\";" >> $t.nix
+        echo "  hash = \"$(jq -r '.hash' <<< "$prefetch_output")\";" >> $t.nix
+        echo "}"
+    done
 
-    prefetch_output=$(nix-prefetch-git https://gerrit.libreoffice.org/core --rev "$rev" --fetch-submodules)
-    fetched_git_path=$(echo "$prefetch_output" | jq -r '.path')
-    hash=$(echo "$prefetch_output" | jq -r '.hash')
-
-    # Generate main.nix
+    local prefetch_output=$(nix-prefetch-git "https://gerrit.libreoffice.org/core" --rev "$rev")
     echo "{ fetchgit, ... }:" > main.nix
     echo "fetchgit {" >> main.nix
-    echo "  url = \"https://gerrit.libreoffice.org/core\";" >> main.nix
+    echo "  url = \"$(jq -r '.url' <<< "$prefetch_output")\";" >> main.nix
     echo "  rev = \"$rev\";" >> main.nix
-    echo "  hash = \"$hash\";" >> main.nix
-    echo "  fetchSubmodules = true;" >> main.nix
+    echo "  hash = \"$(jq -r '.hash' <<< "$prefetch_output")\";" >> main.nix
+    echo "  fetchSubmodules = false;" >> main.nix
     echo "}" >> main.nix
 
     # Environment variable required by ../generate-libreoffice-srcs.py
-    export downloadList="$fetched_git_path/download.lst"
+    export downloadList=$(jq -r '.path' <<< "$prefetch_output")/download.lst
 esac
 
 cd ..