If you install from repository you might getting 4.4.Something.

if you want the latest you have to do some manual work:

cd /software;
mkdir libreoffice;
cd libreoffice;

# download
wget https://ftp.fau.de/tdf/libreoffice/stable/5.2.2/deb/x86/LibreOffice_5.2.2_Linux_x86_deb.tar.gz; # for English
wget https://ftp.fau.de/tdf/libreoffice/stable/5.1.5/deb/x86/LibreOffice_5.1.5_Linux_x86_deb.tar.gz; # for Germans

tar fxvz LibreOffice_5.1.5_Linux_x86_deb.tar.gz; # unpack

# you will have a large amounts of *.deb now

cd DEBS;

ll;

-rw-r--r-- 1 root root 1.7M Jul 29 19:31 libobasis5.1-base_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 8.8M Jul 29 19:31 libobasis5.1-calc_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 130M Jul 29 19:31 libobasis5.1-core_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 4.2K Jul 29 19:31 libobasis5.1-draw_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  86K Jul 29 19:31 libobasis5.1-en-us_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  23K Jul 29 19:31 libobasis5.1-en-us-base_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  51K Jul 29 19:32 libobasis5.1-en-us-calc_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  16K Jul 29 19:28 libobasis5.1-en-us-math_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 183K Jul 29 19:32 libobasis5.1-en-us-res_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 1.1K Jul 29 19:31 libobasis5.1-en-us-writer_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 373K Jul 29 19:31 libobasis5.1-extension-beanshell-script-provider_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 595K Jul 29 19:31 libobasis5.1-extension-javascript-script-provider_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 2.3M Jul 29 19:28 libobasis5.1-extension-mediawiki-publisher_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 999K Jul 29 19:31 libobasis5.1-extension-nlpsolver_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 2.4M Jul 29 19:31 libobasis5.1-extension-pdf-import_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 3.2M Jul 29 19:32 libobasis5.1-extension-report-builder_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  47K Jul 29 19:28 libobasis5.1-filter-data_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 467K Jul 29 19:31 libobasis5.1-gnome-integration_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 4.0M Jul 29 19:32 libobasis5.1-graphicfilter_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 6.2M Jul 29 19:32 libobasis5.1-images_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 661K Jul 29 19:31 libobasis5.1-impress_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 102K Jul 29 19:31 libobasis5.1-kde-integration_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 121K Jul 29 19:31 libobasis5.1-librelogo_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 513K Jul 29 19:31 libobasis5.1-math_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  93K Jul 29 19:31 libobasis5.1-ogltrans_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 145K Jul 29 19:28 libobasis5.1-onlineupdate_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  18M Jul 29 19:31 libobasis5.1-ooofonts_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 1.1K Jul 29 19:31 libobasis5.1-ooolinguistic_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 1.6M Jul 29 19:28 libobasis5.1-postgresql-sdbc_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  11K Jul 29 19:31 libobasis5.1-python-script-provider_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  11M Jul 29 19:32 libobasis5.1-pyuno_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 4.3M Jul 29 19:32 libobasis5.1-writer_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 432K Jul 29 19:31 libobasis5.1-xsltfilter_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 1.7M Jul 29 19:31 libreoffice5.1_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  774 Jul 29 19:31 libreoffice5.1-base_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  774 Jul 29 19:28 libreoffice5.1-calc_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 6.2M Jul 29 08:18 libreoffice5.1-debian-menus_5.1.5-2_all.deb
-rw-r--r-- 1 root root 6.3M Jul 29 19:31 libreoffice5.1-dict-en_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 1.4M Jul 29 19:31 libreoffice5.1-dict-es_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 2.2M Jul 29 19:32 libreoffice5.1-dict-fr_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  776 Jul 29 19:31 libreoffice5.1-draw_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 5.9K Jul 29 19:31 libreoffice5.1-en-us_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  782 Jul 29 19:31 libreoffice5.1-impress_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  776 Jul 29 19:31 libreoffice5.1-math_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root 3.6M Jul 29 19:32 libreoffice5.1-ure_5.1.5.2-2_i386.deb
-rw-r--r-- 1 root root  780 Jul 29 19:31 libreoffice5.1-writer_5.1.5.2-2_i386.deb

dpkg -i *; # install them all
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