positively regulates GTPase activity regulation of GTPase activity positive regulation of GTPase activity up regulation of GTPase activity upregulation of ARF GTPase activity upregulation of GTPase activity stimulation of GTPase activity upregulation of Cdc42 GTPase activity positive regulation of Rab GTPase activity positive regulation of Rho GTPase activity up regulation of Rac GTPase activity upregulation of Rap GTPase activity stimulation of Ras GTPase activity up regulation of Ran GTPase activity up-regulation of Ran GTPase activity up regulation of Rho GTPase activity stimulation of Ran GTPase activity upregulation of Ras GTPase activity positive regulation of Ras GTPase activity positive regulation of Rap GTPase activity GO:0043089 stimulation of Rho GTPase activity stimulation of Rap GTPase activity up regulation of Rab GTPase activity stimulation of Cdc42 GTPase activity up regulation of Ral GTPase activity up-regulation of Rab GTPase activity positive regulation of Rac GTPase activity up-regulation of Cdc42 GTPase activity stimulation of ARF GTPase activity up-regulation of Rac GTPase activity stimulation of Rac GTPase activity stimulation of Ral GTPase activity up regulation of Ras GTPase activity up regulation of Rap GTPase activity biological_process upregulation of Ran GTPase activity positive regulation of Ral GTPase activity up-regulation of Ral GTPase activity GO:0032321 up regulation of Cdc42 GTPase activity GO:0032320 activation of GTPase activity upregulation of Rab GTPase activity positive regulation of ARF GTPase activity upregulation of Rho GTPase activity upregulation of Ral GTPase activity GO:0032855 stimulation of Rab GTPase activity Any process that activates or increases the activity of a GTPase. up-regulation of Ras GTPase activity upregulation of Rac GTPase activity up-regulation of Rho GTPase activity GO:0032850 up-regulation of Rap GTPase activity GO:0032853 GO:0032854 positive regulation of Cdc42 GTPase activity GO:0032851 GO:0032852 up-regulation of ARF GTPase activity up regulation of ARF GTPase activity positive regulation of Ran GTPase activity up-regulation of GTPase activity GO:0043547 positive regulation of hydrolase activity biological regulation