diff --git a/src/_cffi_src/openssl/ct.py b/src/_cffi_src/openssl/ct.py
index cdbaac0..e7550bc 100644
--- a/src/_cffi_src/openssl/ct.py
+++ b/src/_cffi_src/openssl/ct.py
@@ -26,6 +26,13 @@
     CT_LOG_ENTRY_TYPE_PRECERT
 } ct_log_entry_type_t;
 
+typedef enum {
+    SCT_SOURCE_UNKNOWN,
+    SCT_SOURCE_TLS_EXTENSION,
+    SCT_SOURCE_X509V3_EXTENSION,
+    SCT_SOURCE_OCSP_STAPLED_RESPONSE
+} sct_source_t;
+
 typedef ... SCT;
 typedef ... Cryptography_STACK_OF_SCT;
 """
@@ -42,8 +49,12 @@
 
 uint64_t SCT_get_timestamp(const SCT *);
 
+int SCT_set_source(SCT *, sct_source_t);
+
 int sk_SCT_num(const Cryptography_STACK_OF_SCT *);
 SCT *sk_SCT_value(const Cryptography_STACK_OF_SCT *, int);
+
+void SCT_LIST_free(Cryptography_STACK_OF_SCT *);
 """
 
 CUSTOMIZATIONS = """
@@ -61,6 +72,12 @@
     CT_LOG_ENTRY_TYPE_X509,
     CT_LOG_ENTRY_TYPE_PRECERT
 } ct_log_entry_type_t;
+typedef enum {
+    SCT_SOURCE_UNKNOWN,
+    SCT_SOURCE_TLS_EXTENSION,
+    SCT_SOURCE_X509V3_EXTENSION,
+    SCT_SOURCE_OCSP_STAPLED_RESPONSE
+} sct_source_t;
 typedef void SCT;
 typedef void Cryptography_STACK_OF_SCT;
 
@@ -69,7 +86,11 @@
 size_t (*SCT_get0_log_id)(const SCT *, unsigned char **) = NULL;
 uint64_t (*SCT_get_timestamp)(const SCT *) = NULL;
 
+int (*SCT_set_source)(SCT *, sct_source_t) = NULL;
+
 int (*sk_SCT_num)(const Cryptography_STACK_OF_SCT *) = NULL;
 SCT *(*sk_SCT_value)(const Cryptography_STACK_OF_SCT *, int) = NULL;
+
+void (*SCT_LIST_free)(Cryptography_STACK_OF_SCT *) = NULL;
 #endif
 """
diff --git a/src/cryptography/hazmat/bindings/openssl/_conditional.py b/src/cryptography/hazmat/bindings/openssl/_conditional.py
index 5f9bdc5..8605477 100644
--- a/src/cryptography/hazmat/bindings/openssl/_conditional.py
+++ b/src/cryptography/hazmat/bindings/openssl/_conditional.py
@@ -161,7 +161,9 @@
         "SCT_get_log_entry_type",
         "SCT_get0_log_id",
         "SCT_get_timestamp",
+        "SCT_set_source",
         "sk_SCT_num",
         "sk_SCT_value",
+        "SCT_LIST_free",
     ],
 }