diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa24ff6..30d0051 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,12 @@ Note that the log for version before v0.1.1 may not be in the mentioned format.
 
 ## [Unreleased]
 
+## v0.1.2a4 - 2024-10-01
+
+### Changed
+
+- Force `sys.stdout` for `MinimalistTestRunner.stream` to prevent stdout and stderr weaving output on GitHub Actions.
+
 ## v0.1.2a3 - 2024-10-01
 
 ### Changed
diff --git a/grading_lib/VERSION b/grading_lib/VERSION
index b7d9b23..2b66ed8 100644
--- a/grading_lib/VERSION
+++ b/grading_lib/VERSION
@@ -1 +1 @@
-0.1.2a3
\ No newline at end of file
+0.1.2a4
\ No newline at end of file
diff --git a/grading_lib/cli/__init__.py b/grading_lib/cli/__init__.py
index 38427a1..8437410 100644
--- a/grading_lib/cli/__init__.py
+++ b/grading_lib/cli/__init__.py
@@ -8,8 +8,7 @@
 import click
 
 from ..common import MinimalistTestResult, MinimalistTestRunner
-from ..util import (FindProblemList, get_problem_total_points,
-                    load_problems_metadata)
+from ..util import FindProblemList, get_problem_total_points, load_problems_metadata
 from .dev import dev
 from .internal import internal
 
@@ -107,7 +106,7 @@ def grade_command(path: str | Path) -> None:
             importlib.invalidate_caches()
             mod = importlib.import_module("scripts.grade")
 
-            runner = MinimalistTestRunner(resultclass=MinimalistTestResult)
+            runner = MinimalistTestRunner(stream=sys.stdout, resultclass=MinimalistTestResult)
             test_program = unittest.main(
                 mod, testRunner=runner, argv=[sys.argv[0]], exit=False
             )