When applying patches, such as PSUs or one-offs, you may need to update OPatch to meet the minimum OPatch version.  It is also recommended to update OPatch when applying any patch.

To see your current OPatch version:

[oracle@v1ex1dbadm01 ~]$ export ORACLE_HOME=/u01/app/oracle/product/12.1.0.2/dbhome_1
[oracle@v1ex1dbadm01 ~]$ $ORACLE_HOME/OPatch/opatch version
OPatch Version: 12.1.0.1.3

OPatch succeeded.
[oracle@v1ex1dbadm01 ~]$

Backup existing OPatch:

[oracle@v1ex1dbadm01 ~]$ cd $ORACLE_HOME
[oracle@v1ex1dbadm01 dbhome_1]$ tar -cvf OPatch_backup.tar OPatch/*
OPatch/datapatch
OPatch/datapatch.bat
OPatch/docs/
...
OPatch/oplan/README.txt
OPatch/oplan/README.html
OPatch/oplan/oplan
[oracle@v1ex1dbadm01 dbhome_1]$

Check the backup of OPatch:

[oracle@v1ex1dbadm01 dbhome_1]$ ls -lh | grep OPatch_backup.tar
-rw-rw-r--. 1 oracle oracle 6.7M Aug 29 11:51 OPatch_backup.tar
[oracle@v1ex1dbadm01 dbhome_1]$

Remove the existing OPatch:

[oracle@v1ex1dbadm01 dbhome_1]$ rm -rf OPatch

Unzip the latest OPatch:

[oracle@v1ex1dbadm01 dbhome_1]$ unzip -d $ORACLE_HOME ~/sw/p6880880_122010_Linux-x86-64.zip
Archive: /home/oracle/sw/p6880880_122010_Linux-x86-64.zip
creating: /u01/app/oracle/product/12.1.0/dbhome_1/OPatch/
inflating: /u01/app/oracle/product/12.1.0/dbhome_1/OPatch/datapatch
...
inflating: /u01/app/oracle/product/12.1.0/dbhome_1/OPatch/docs/cversion.txt
inflating: /u01/app/oracle/product/12.1.0/dbhome_1/OPatch/docs/FAQ
inflating: /u01/app/oracle/product/12.1.0/dbhome_1/OPatch/opatch.bat
[oracle@v1ex1dbadm01 dbhome_1]$

Which can be found here:
OPatch – Where Can I Find the Latest Version of OPatch(6880880)? [Video] (Doc ID 224346.1)
OPATCH PLACEHOLDER Patch 6880880

To see your newOPatch version:

[oracle@v1ex1dbadm01 dbhome_1]$ $ORACLE_HOME/OPatch/opatch version
OPatch Version: 12.2.0.1.9

OPatch succeeded.
[oracle@v1ex1dbadm01 dbhome_1]$

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Thanks

Zed DBA (Zahid Anwar)