diff --git a/lib/compute-at-edge-abi/compute-at-edge.witx b/lib/compute-at-edge-abi/compute-at-edge.witx
index 83c2b3e5..226d2486 100644
--- a/lib/compute-at-edge-abi/compute-at-edge.witx
+++ b/lib/compute-at-edge-abi/compute-at-edge.witx
@@ -127,6 +127,12 @@
         (result $err (expected (error $fastly_status)))
     )
 
+    (@interface func (export "downstream_tls_ja3_md5")
+        ;; must be a 16-byte array
+        (param $cja3_md5_out (@witx pointer (@witx char8)))
+        (result $err (expected $num_bytes (error $fastly_status)))
+    )
+
     (@interface func (export "new")
         (result $err (expected $request_handle (error $fastly_status)))
     )
@@ -304,6 +310,11 @@
         (result $err (expected (error $fastly_status)))
     )
 
+    (@interface func (export "upgrade_websocket")
+        (param $backend_name string)
+        (result $err (expected (error $fastly_status)))
+    )
+
     ;;; Adjust how this requests's framing headers are determined.
     (@interface func (export "framing_headers_mode_set")
         (param $h $request_handle)
diff --git a/lib/src/wiggle_abi/req_impl.rs b/lib/src/wiggle_abi/req_impl.rs
index ceb1ba77..92cabda7 100644
--- a/lib/src/wiggle_abi/req_impl.rs
+++ b/lib/src/wiggle_abi/req_impl.rs
@@ -94,6 +94,11 @@ impl FastlyHttpReq for Session {
         Err(Error::NotAvailable("Client TLS data"))
     }
 
+    #[allow(unused_variables)] // FIXME ACF 2022-05-03: Remove this directive once implemented.
+    fn upgrade_websocket(&mut self, backend_name: &GuestPtr<str>) -> Result<(), Error> {
+        Err(Error::NotAvailable("WebSocket upgrade"))
+    }
+
     #[allow(unused_variables)] // FIXME KTM 2020-06-25: Remove this directive once implemented.
     fn downstream_tls_protocol<'a>(
         &mut self,
@@ -114,6 +119,11 @@ impl FastlyHttpReq for Session {
         Err(Error::NotAvailable("Client TLS data"))
     }
 
+    #[allow(unused_variables)] // FIXME ACF 2022-05-03: Remove this directive once implemented.
+    fn downstream_tls_ja3_md5(&mut self, ja3_md5_out: &GuestPtr<u8>) -> Result<u32, Error> {
+        Err(Error::NotAvailable("Client TLS JA3 hash"))
+    }
+
     fn framing_headers_mode_set(
         &mut self,
         _h: RequestHandle,