diff --git a/secp256k1-zkp-sys/depend/secp256k1/src/scratch_impl.h b/secp256k1-zkp-sys/depend/secp256k1/src/scratch_impl.h
index f71a20b..5389571 100644
--- a/secp256k1-zkp-sys/depend/secp256k1/src/scratch_impl.h
+++ b/secp256k1-zkp-sys/depend/secp256k1/src/scratch_impl.h
@@ -10,31 +10,6 @@
 #include "util.h"
 #include "scratch.h"
 
-static secp256k1_scratch* secp256k1_scratch_create(const secp256k1_callback* error_callback, size_t size) {
-    const size_t base_alloc = ROUND_TO_ALIGN(sizeof(secp256k1_scratch));
-    void *alloc = checked_malloc(error_callback, base_alloc + size);
-    secp256k1_scratch* ret = (secp256k1_scratch *)alloc;
-    if (ret != NULL) {
-        memset(ret, 0, sizeof(*ret));
-        memcpy(ret->magic, "scratch", 8);
-        ret->data = (void *) ((char *) alloc + base_alloc);
-        ret->max_size = size;
-    }
-    return ret;
-}
-
-static void secp256k1_scratch_destroy(const secp256k1_callback* error_callback, secp256k1_scratch* scratch) {
-    if (scratch != NULL) {
-        if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
-            secp256k1_callback_call(error_callback, "invalid scratch space");
-            return;
-        }
-        VERIFY_CHECK(scratch->alloc_size == 0); /* all checkpoints should be applied */
-        memset(scratch->magic, 0, sizeof(scratch->magic));
-        free(scratch);
-    }
-}
-
 static size_t secp256k1_scratch_checkpoint(const secp256k1_callback* error_callback, const secp256k1_scratch* scratch) {
     if (secp256k1_memcmp_var(scratch->magic, "scratch", 8) != 0) {
         secp256k1_callback_call(error_callback, "invalid scratch space");