diff --git a/circomcompatffi.nim b/circomcompatffi.nim
index df5e9b6..87c40a7 100644
--- a/circomcompatffi.nim
+++ b/circomcompatffi.nim
@@ -74,6 +74,9 @@ proc init_circom_config*(r1cs_path: pointer,
 proc init_circom_compat*(cfg_ptr: ptr CircomBn254Cfg,
                          ctx_ptr: ptr ptr CircomCompatCtx): int32 {.importc: "init_circom_compat".}
 
+proc duplicate_circom_config*(cfg_ptr: ptr CircomBn254Cfg,
+                              ctx_ptr: ptr ptr CircomCompatCtx): int32 {.importc: "duplicate_circom_config".}
+
 proc release_circom_compat*(ctx_ptr: ptr ptr CircomCompatCtx): void {.importc: "release_circom_compat".}
 
 proc release_cfg*(cfg_ptr: ptr ptr CircomBn254Cfg): void {.importc: "release_cfg".}
diff --git a/vendor/circom-compat-ffi b/vendor/circom-compat-ffi
index ed6dfc6..bb8ef86 160000
--- a/vendor/circom-compat-ffi
+++ b/vendor/circom-compat-ffi
@@ -1 +1 @@
-Subproject commit ed6dfc60e7876a6bfb46b696f517048dc2dff704
+Subproject commit bb8ef86fefabc15a3af778e49a0264a8ed745de2