Nexus 4 end of support

Nexus devices will also receive updates for security issues documented in our Public Nexus Security Bulletins for at least the following periods:

• Three years from when the device first became available on the Google Store

  
  



• Or, 18 months after the device stopped being sold on the Google Store

  
  

Source

As Nexus 4 was released on November 13th 2012 it is outside this time frame and will likely not receive many more monthly updates.