diff --git a/.cargo/config.toml b/.cargo/config.toml
new file mode 100644
index 0000000000000000000000000000000000000000..8af59dd8cf84353bb1ba6e731b869ef999d49c02
--- /dev/null
+++ b/.cargo/config.toml
@@ -0,0 +1,2 @@
+[env]
+RUST_TEST_THREADS = "1"