diff --git a/.circleci/config.yml b/.circleci/config.yml
index b6060176..e1107d3f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -232,7 +232,7 @@ workflows:
       - test-linux:
           matrix:
             parameters:
-              python-version: &python-versions ["3.9.19", "3.10.14", "3.11.9", "3.12.3", "3.13.0"]
+              python-version: &python-versions ["3.9.21", "3.10.16", "3.11.11", "3.12.8", "3.13.1"]
       - test-macos:
           matrix:
             parameters:
@@ -240,7 +240,8 @@ workflows:
       - test-windows:
           matrix:
             parameters:
-              python-version: *python-versions
+              # note: limit to versions available via nuget
+              python-version: &python-versions-windows ["3.9.13", "3.10.11", "3.11.9", "3.12.8", "3.13.1"]
       # - test-individual-pkgs
       - test-doctest
 
@@ -268,5 +269,5 @@ workflows:
       - test-windows:
           matrix:
             parameters:
-              python-version: *python-versions
+              python-version: *python-versions-windows
       - test-doctest