diff --git a/requirements-dev.txt b/requirements-dev.txt
index 615d7d7..38a2a38 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -37,7 +37,7 @@ cattrs==26.2.0
     # via requests-cache
 celery==5.7.0
     # via ro-crate-validation-service (pyproject.toml)
-certifi==2026.7.22
+certifi==2026.10.18
     # via requests
 cffi==2.1.1
     # via cryptography
diff --git a/requirements.txt b/requirements.txt
index 224388d..b4a6761 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -32,7 +32,7 @@ cattrs==26.2.0
     # via requests-cache
 celery==5.7.0
     # via ro-crate-validation-service (pyproject.toml)
-certifi==2026.7.22
+certifi==2026.10.18
     # via requests
 charset-normalizer==3.5.1
     # via requests