Richard Bruton has been named as Minister for Communications, Climate Action and Environment following the resignation of Denis Naughten.
With Mr Bruton moving departments, Joe McHugh has been nominated as Minister for Education and Skills.
In other Cabinet moves, Independent TD Sean Canney has been named as Minister of State for Rural Affairs and Natural Resources.
It is understood the nomination of Mr Canney was made after an intervention from Independent Alliance TDs who expressed the view that independents should be reflected in any new appointments.
Sean Kyne has also been named as Government Chief Whip and Minister with Responsibility for the Gaeltacht.
The nominations were announced in a statement by Taoiseach Leo Varadkar this morning and are subject to Dáil approval next week.
Mr Canney's promotion shores up his support for the minority administration and gives the Government a guaranteed 55 Dáil votes, however that is still two votes shy of the required 57.
This means that Independent TDs Michael Lowry and Noel Grealish are key figures in the survival of the administration.
Mr Bruton said he is "delighted" to have been chosen to replace Mr Naughten, and said he is committed to implementing the National Broadband Plan.
In a statement he said he was "looking forward to this new challenge, working on some of the most crucial issues currently facing the country."
"I am committed to implementing the National Broadband Plan, which will deliver broadband to over 500,000 homes, schools and businesses across the country."
"I'm delighted the Taoiseach has chosen me to lead on this crucial issue and am excited to take on the challenges and opportunities the new role will bring" he said.
Additional Reporting: Justin McCarthy, Mícheál Lehane