diff --git a/dvc/dvcfile.py b/dvc/dvcfile.py
index 37144805b..377f54035 100644
--- a/dvc/dvcfile.py
+++ b/dvc/dvcfile.py
@@ -110,7 +110,7 @@ class FileMixin:
         if not self.repo.tree.isfile(self.path):
             raise StageFileIsNotDvcFileError(self.path)
 
-        with self.repo.tree.open(self.path) as fd:
+        with self.repo.tree.open(self.path, encoding="utf-8") as fd:
             stage_text = fd.read()
         d = parse_yaml(stage_text, self.path)
         self.validate(d, self.relpath)
@@ -254,7 +254,7 @@ class PipelineFile(FileMixin):
         if not self.exists():
             return
 
-        with open(self.path, "r") as f:
+        with open(self.path, "r", encoding="utf-8") as f:
             d = parse_yaml_for_update(f.read(), self.path)
 
         self.validate(d, self.path)
@@ -310,7 +310,7 @@ class Lockfile(FileMixin):
         if not self.exists():
             return
 
-        with open(self.path) as f:
+        with open(self.path, encoding="utf-8") as f:
             d = parse_yaml_for_update(f.read(), self.path)
         self.validate(d, self.path)