Response review

As of today (July 2026), Chip Roy (R) is still your sitting U.S. Representative for TX-21 — he's held the seat since January 2019. However, a couple of things worth knowing:

Roy is retiring from the seat to run for Texas Attorney General in 2026, so he won't be running for reelection. 
Wikipedia
In the March 3, 2026 primary, Kristin Hook won the Democratic nomination, and Mark Teixeira (the former MLB player) won the Republican nomination for the open TX-21 seat. The general election is scheduled for November 3, 2026, so Roy remains your representative until a successor is sworn in next January. 
Ballotpedia
Ballotpedia
There's also been redistricting turmoil: Texas passed a new congressional map in 2025 amid a mid-decade redistricting push, which was challenged in court, blocked by a federal panel, then reinstated by the Supreme Court for use in 2026. Depending on your exact address, your district lines may have shifted somewhat under the new map, with the district now including areas like Fredericksburg, Boerne, Kerrville, Bandera, New Braunfels, most of Hays County, and northwest San Antonio. 
Wikipedia
Ballotpedia

If you want to double check you're actually in TX-21 under the new map (versus possibly being redrawn into a neighboring district), I'd suggest plugging your address into a district lookup tool like the one on house.gov or Ballotpedia.

Cited sources

• https://en.wikipedia.org/wiki/2026_United_States_House_of_Representatives_elections_in_Texas
• https://ballotpedia.org/Texas'_21st_Congressional_District_election,_2026
• https://ballotpedia.org/Texas'_21st_Congressional_District