diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1ffaf1d..34e8014 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.17.1 - 2024-06-14
+
+-   Fixed `'tuple' object has no attribute 'week'` error on Python <= 3.8
+
 ## v0.17.0 - 2024-04-21
 
 -   added arguments `--min-version` and `--squash-patches` for more control over `--git-tags` mode
diff --git a/src/poxy/project.py b/src/poxy/project.py
index 53996c3..53ed9eb 100644
--- a/src/poxy/project.py
+++ b/src/poxy/project.py
@@ -7,6 +7,7 @@
 Everything relating to the 'project context' object that describes the project for which the documentation is being generated.
 """
 
+import sys
 import copy
 import os
 
@@ -1222,7 +1223,10 @@ def __init__(
             html_exclude = re.compile(str(html_exclude))
         self.html_exclude = html_exclude
 
-        self.now = datetime.datetime.utcnow().replace(microsecond=0, tzinfo=datetime.timezone.utc)
+        if (sys.version_info[0], sys.version_info[1]) >= (3, 11):
+            self.now = datetime.datetime.now(datetime.UTC).replace(microsecond=0)
+        else:
+            self.now = datetime.datetime.utcnow().replace(microsecond=0, tzinfo=datetime.timezone.utc)
 
         self.verbose_value(r'dirs.PACKAGE', paths.PACKAGE)
         self.verbose_value(r'dirs.CSS', paths.CSS)
@@ -1657,7 +1661,7 @@ def add_internal_asset(p) -> str:
                 if source and dest:
                     if is_uri(source):
                         file = Path(
-                            paths.TEMP, rf'tagfile_{sha1(source)}_{self.now.year}_{self.now.isocalendar().week}.xml'
+                            paths.TEMP, rf'tagfile_{sha1(source)}_{self.now.year}_{self.now.isocalendar()[1]}.xml'
                         )
                         self.tagfiles[source] = (file, dest)
                         self.unresolved_tagfiles = True
diff --git a/src/poxy/version.txt b/src/poxy/version.txt
index c5523bd..7cca771 100644
--- a/src/poxy/version.txt
+++ b/src/poxy/version.txt
@@ -1 +1 @@
-0.17.0
+0.17.1