diff -r 2da754532dd3 -r 69de49c4e39c contrib/python-zstandard/zstd/decompress/zstd_decompress_internal.h
--- a/contrib/python-zstandard/zstd/decompress/zstd_decompress_internal.h	Sun Sep 15 00:07:30 2019 -0400
+++ b/contrib/python-zstandard/zstd/decompress/zstd_decompress_internal.h	Sun Sep 15 20:04:00 2019 -0700
@@ -89,6 +89,12 @@
 typedef enum { zdss_init=0, zdss_loadHeader,
                zdss_read, zdss_load, zdss_flush } ZSTD_dStreamStage;
 
+typedef enum {
+    ZSTD_use_indefinitely = -1,  /* Use the dictionary indefinitely */
+    ZSTD_dont_use = 0,           /* Do not use the dictionary (if one exists free it) */
+    ZSTD_use_once = 1            /* Use the dictionary once and set to ZSTD_dont_use */
+} ZSTD_dictUses_e;
+
 struct ZSTD_DCtx_s
 {
     const ZSTD_seqSymbol* LLTptr;
@@ -123,6 +129,7 @@
     const ZSTD_DDict* ddict;     /* set by ZSTD_initDStream_usingDDict(), or ZSTD_DCtx_refDDict() */
     U32 dictID;
     int ddictIsCold;             /* if == 1 : dictionary is "new" for working context, and presumed "cold" (not in cpu cache) */
+    ZSTD_dictUses_e dictUses;
 
     /* streaming */
     ZSTD_dStreamStage streamStage;