PCI DSS 3.1 updates requirements 2.2.3, 2.3 and 4.1 to remove SSL and early TLS as examples of strong cryptography. The National Institute of Standards and Technology (NIST) identified SSL (a cryptographic protocol designed to provide secure communications over a computer network) as not being acceptable for the protection of data due to inherent weaknesses within the protocol.
Read PCI Council full press release here - https://www.pcisecuritystandards.org/pdfs/15_04_15%20PCI%20DSS%203%201%20Press%20Release.pdf