Here is the updated color palette with the addition of yellow alongside the existing colors:

{
  "palette_name": "Earthy Warmth with a Pop",
  "colors": [
    {
      "name": "Warm Beige",
      "hex_code": "
                            
                            #E6D5C3
                        "
    },
    {
      "name": "Cocoa Brown",
      "hex_code": "
                            
                            #8B5E3C
                        "
    },
    {
      "name": "Sage Green",
      "hex_code": "
                            
                            #A6B17E
                        "
    },
    {
      "name": "Emerald Green",
      "hex_code": "
                            
                            #137A5F
                        "
    },
    {
      "name": "Berry Pink",
      "hex_code": "
                            
                            #D6396D
                        "
    },
    {
      "name": "Dusty Rose",
      "hex_code": "
                            
                            #D8A39E
                        "
    },
    {
      "name": "Vibrant Teal",
      "hex_code": "
                            
                            #008080
                        "
    },
    {
      "name": "Bright Yellow",
      "hex_code": "
                            
                            #FFD700
                        "
    }
  ]
}

This palette now includes a bright yellow, which adds a cheerful and lively touch to the warm and earthy tones. If you have any more changes or need further assistance, just let me know!