According to the website of the Council of the European Union, Lithuania has completed its ratification formalities on 24 August 2017. This is the 14th ratification following that of Estonia which joined the unitary patent system on 1 August 2017.
To be complete, the unitary patent system requires 13 ratifications, including France, Germany and the United Kingdom. France is already part of the system since 14 March 2014. However, according to the Preparatory Committee, the United Kingdom and Germany still have some hurdles to overcome before the unitary patent system enters into force (you can see our previous posts on the situation in the UK and Germany)
Still, the Preparatory Committee is confident that the UPC will come into force around January 2018.