--- a/setup.py
+++ b/setup.py
@@ -45,12 +45,6 @@
                 "_rust",
                 "src/rust/Cargo.toml",
                 py_limited_api=True,
-                # Enable abi3 mode if we're not using PyPy.
-                features=(
-                    []
-                    if platform.python_implementation() == "PyPy"
-                    else ["pyo3/abi3-py36"]
-                ),
                 rust_version=">=1.41.0",
             )
         ],