diff --git a/pyodide_lock/spec.py b/pyodide_lock/spec.py
index 9fdafa4..542fe1f 100644
--- a/pyodide_lock/spec.py
+++ b/pyodide_lock/spec.py
@@ -10,6 +10,7 @@ class InfoSpec(BaseModel):
     platform: str
     version: str
     python: str
+    abi_version: str | None = None
     model_config = ConfigDict(extra="forbid")
 
 
diff --git a/pyodide_lock/utils.py b/pyodide_lock/utils.py
index 95b53fa..b783a6a 100644
--- a/pyodide_lock/utils.py
+++ b/pyodide_lock/utils.py
@@ -103,7 +103,7 @@ def _generate_package_hash(full_path: Path) -> str:
 
 
 def _get_marker_environment(
-    platform: str, version: str, arch: str, python: str
+    platform: str, version: str, arch: str, python: str, abi_version: str | None = None
 ) -> dict[str, str]:
     """
     Get the marker environment for this pyodide-lock file. If running