diff --git a/constraints/minimum.txt b/constraints/minimum.txt
index 5126cc5..68ee9ab 100644
--- a/constraints/minimum.txt
+++ b/constraints/minimum.txt
@@ -14,5 +14,5 @@ pytz==2023.3
 packaging==21.0
 
 # data-yahoo / data-cn transitives: keep a working TLS stack.
-pyOpenSSL==25.0.0
+pyOpenSSL==26.4.0
 cryptography==45.0.0