diff --git a/Cargo.toml b/Cargo.toml
index 9c854d1227c26e..058db6551abe70 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -134,7 +134,10 @@ lsp-server = { version = "0.10.0" }
 lsp-types = { package = "gen-lsp-types", version = "0.11.0", features = ["url"] }
 matchit = { version = "0.9.0" }
 memchr = { version = "2.7.1" }
-mimalloc = { version = "0.1.52" }
+# mimalloc v3.3.2 crashes on Windows CPUs that do not support POPCNT.
+# Fixed in mimalloc v3.4.0: https://github.com/microsoft/mimalloc/issues/1291
+# Keep v2 until an updated Rust crate includes the fix.
+mimalloc = { version = "0.1.52", features = ["v2"] }
 natord = { version = "1.0.9" }
 notify = { version = "8.0.0" }
 ordermap = { version = "1.0.0" }