The game is occasionally updated by Nicalis (the developers). These pages will attempt to track all of the changes, which are often undocumented. You can find the official manifests for Afterbirth+ on SteamDB.info.
Afterbirth+
Afterbirth
Rebirth
Version History
Rebirth
v0.9 , v1.0 , v1.01 , v1.02 , v1.031 , v1.032 , v1.04 , v1.041 , v1.05 (Hotfix )
Afterbirth
v1.06 (Hotfix ), v1.06.0051 , v1.06.0052 , v1.06.0059 , v1.06.0060 , v1.06.0067 , v1.06.0076 , v1.06.0109
Afterbirth †
v1.06.0180 , v1.06.0181 , v1.06.0182 , v1.06.0183 , v1.06.0185 , v1.06.0187 , v1.06.0188 , v1.06.0190 , v1.06.0192 (Re-release ), v1.06.0193 , v1.06.0211
Booster Pack #1
v1.06.J34 , v1.06.J39
Booster Pack #2
v1.06.J75 , v1.06.J85
Booster Pack #3
v1.06.J99 , v1.06.J103 , v1.06.J104
Booster Pack #4
v1.06.J113 , v1.06.J114 , v1.06.J119 , v1.06.J127
Booster Pack #5
v1.06.J149 , v1.06.J150 , v1.06.J168
Repentance
v1.06.J787 , v1.06.J791 , v1.06.J796 , v1.06.J813 , v1.06.J818 , v1.06.J820 , v1.7.5 , v1.7.6 , v1.7.7 , v1.7.7a , v1.7.8 , v1.7.8a , v1.7.9 , v1.7.9a , Online , V1.9.2 (Beta) , V1.9.3 (Beta) , V1.9.4 (Beta) , V1.9.5 (Beta) , V1.9.6 (Beta) , V1.9.7 (Beta) , V1.9.7.1 (Beta)