Yes.
Instagram has updated its post size guidelines in 2025, shifting from the square 1:1 aspect ratio to a more vertical 4:5 aspect ratio. The recommended size for portrait-oriented posts is now 1080 x 1350 pixels. While 1:1 (square) and 1.91:1 (landscape) images are still supported, the 4:5 ratio is now the preferred format for feed posts.