diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 13b3abc62bd..838b1f24ebe 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -69,7 +69,7 @@ repos:
     files: \.py$
 
 - repo: https://github.com/pre-commit/mirrors-mypy
-  rev: v0.770
+  rev: v0.790
   hooks:
   - id: mypy
     exclude: docs|tests
diff --git a/src/pip/_internal/exceptions.py b/src/pip/_internal/exceptions.py
index 62bde1eeda4..56482caf77b 100644
--- a/src/pip/_internal/exceptions.py
+++ b/src/pip/_internal/exceptions.py
@@ -200,7 +200,7 @@ class HashError(InstallationError):
     """
     req = None  # type: Optional[InstallRequirement]
     head = ''
-    order = None  # type: Optional[int]
+    order = -1  # type: int
 
     def body(self):
         # type: () -> str