diff --git a/dev-requirements/dev.txt b/dev-requirements/dev.txt
index 33e0de94..901169d3 100644
--- a/dev-requirements/dev.txt
+++ b/dev-requirements/dev.txt
@@ -2,7 +2,7 @@
 alabaster==0.7.16
 babel==2.17.0
 cellmlmanip==0.3.7
-certifi==2025.1.31
+certifi==2026.10.19
 charset-normalizer==3.4.1
 coverage==7.6.11
 decorator==5.1.1