diff --git a/python-stdlib/unittest/manifest.py b/python-stdlib/unittest/manifest.py
index a01bbb8e6..fea2a87f2 100644
--- a/python-stdlib/unittest/manifest.py
+++ b/python-stdlib/unittest/manifest.py
@@ -1,3 +1,3 @@
-metadata(version="0.10.4")
+metadata(version="0.10.5")
 
 package("unittest")
diff --git a/python-stdlib/unittest/unittest/__init__.py b/python-stdlib/unittest/unittest/__init__.py
index 61b315788..8014e2828 100644
--- a/python-stdlib/unittest/unittest/__init__.py
+++ b/python-stdlib/unittest/unittest/__init__.py
@@ -1,5 +1,4 @@
 import io
-import os
 import sys
 
 try:
@@ -49,10 +48,10 @@ def __exit__(self, *exc_info):
             global __test_result__, __current_test__
             test_details = __current_test__
             if self.msg:
-                test_details += (f" [{self.msg}]",)
+                test_details += (" [%s]" % self.msg,)
             if self.params:
-                detail = ", ".join(f"{k}={v}" for k, v in self.params.items())
-                test_details += (f" ({detail})",)
+                detail = ", ".join("%s=%s" % k_v for k_v in self.params.items())
+                test_details += (" (%s)" % detail,)
 
             _handle_test_exception(test_details, __test_result__, exc_info, False)
         # Suppress the exception as we've captured it above
@@ -310,7 +309,7 @@ def printErrorList(self, lst):
         for c, e in lst:
             detail = " ".join((str(i) for i in c))
             print("======================================================================")
-            print(f"FAIL: {detail}")
+            print("FAIL:", detail)
             print(sep)
             print(e)
 
@@ -391,7 +390,7 @@ def run_one(test_function):
         print("%s (%s) ..." % (name, suite_name), end="")
         set_up()
         __test_result__ = test_result
-        test_container = f"({suite_name})"
+        test_container = "(%s)" % suite_name
         __current_test__ = (name, test_container)
         try:
             test_result._newFailures = 0