diff --git a/poetry.lock b/poetry.lock
index d097107..d7b9bb9 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -134,14 +134,14 @@ virtualenv = ["virtualenv (>=20.0.35)"]
 
 [[package]]
 name = "certifi"
-version = "2026.4.22"
+version = "2026.5.20"
 description = "Python package for providing Mozilla's CA Bundle."
 optional = false
 python-versions = ">=3.7"
 groups = ["main", "dev"]
 files = [
-    {file = "certifi-2026.4.22-py3-none-any.whl", hash = "sha256:3cb2210c8f88ba2318d29b0388d1023c8492ff72ecdde4ebdaddbb13a31b1c4a"},
-    {file = "certifi-2026.4.22.tar.gz", hash = "sha256:8d455352a37b71bf76a79caa83a3d6c25afee4a385d632127b6afb3963f1c580"},
+    {file = "certifi-2026.5.20-py3-none-any.whl", hash = "sha256:3c52e209ba0a4ad7aebe60436a4ab349c39e1e602e8c134221e546902ad25897"},
+    {file = "certifi-2026.5.20.tar.gz", hash = "sha256:69dea482ab64caa7b9f6aba1c6bf48bb6a5448d1c0f1b17ab42ad8c763a5344d"},
 ]
 
 [[package]]
@@ -3275,4 +3275,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.1"
 python-versions = "^3.9"
-content-hash = "b3a242dec2b8531a341f5fc7dc96efacdb935594c0c6615e61f73c400f4a1f0d"
+content-hash = "0e7f066a37b74ca73c49c9cf9979a0193cd7b37271b8b79d2d54c49a50aeddfe"
diff --git a/pyproject.toml b/pyproject.toml
index 8b9f054..56f2339 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,7 +30,7 @@ include = [ "tests/data/*.csv", "src/dataanalysistoolkit/.conf/*.json"]
 [tool.poetry.dependencies]
 python = "^3.9"
 # dataanalysistoolkit = {path = "../src/dataanalysistoolkit/", develop = true}
-certifi = "2026.4.22"
+certifi = "2026.5.20"
 charset-normalizer = "3.4.7"
 click = "8.1.8"
 colorama = "0.4.6"