The following issues have been resolved since 1.9.5:

Bugs: #246, #261, #240, #227, #232, #245, #199, #262, #268

Security problems (low): #249

Features: #251 (SQL tab query history), #204 (optionally show long texts completely), #136 (upgrade notifications), #79 solved partly (dropping primary keys)

Code improvements: #193, #234, #244

Requirements: At least PHP 5.2.0 is required now

See commit log for details since commit af32e0ef085d6b0651e1e66f8d7385fd8c5a6662