diff --git a/Cargo.toml b/Cargo.toml
index 3a78dcc..9feb293 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,7 +27,8 @@ tts = { version = "0.25.0", optional = true }
 wgpu = { version = "29" }
 spin_sleep = "1.1.1"
 arie = "0.3.0"
-fast3d = { git = "https://github.com/retrofoundry/fast3d-rs", default-features = false }
+# Pinned: fast3d may change its API between commits; bump this deliberately and fix up the render path with it.
+fast3d = { git = "https://github.com/retrofoundry/fast3d-rs", rev = "3b58119d86e07773ecf7682cc6c1ef6e04dd9aa7", default-features = false }
 rustc-hash = "1.1.0"
 
 # For local development, uncomment to build against local checkouts of fast3d and