From b4232bdc7c7eb96bfaeaa02777aa6f6a0f57d7d5 Mon Sep 17 00:00:00 2001
From: Ruslan Kuprieiev <kupruser@gmail.com>
Date: Mon, 8 Mar 2021 17:00:40 +0200
Subject: [PATCH] state: use pickle v4 (#5571)

Kudos @skshetry for the discovery, research and fix.

Fixes #5563
---
 dvc/state.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/dvc/state.py b/dvc/state.py
index 3d7b4a307..219c4ca7d 100644
--- a/dvc/state.py
+++ b/dvc/state.py
@@ -76,7 +76,10 @@ class State(StateBase):  # pylint: disable=too-many-instance-attributes
         if not tmp_dir:
             return
 
-        config = {"eviction_policy": "least-recently-used"}
+        config = {
+            "eviction_policy": "least-recently-used",
+            "disk_pickle_protocol": 4,
+        }
         self.links = Cache(directory=os.path.join(tmp_dir, "links"), **config)
         self.md5s = Cache(directory=os.path.join(tmp_dir, "md5s"), **config)