diff --git a/requirements-dev.txt b/requirements-dev.txt
index 49dca92e6..0408ab9db 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -526,9 +526,9 @@ pytest-django==4.8.0 \
     --hash=sha256:5d054fe011c56f3b10f978f41a8efb2e5adfc7e680ef36fb571ada1f24779d90 \
     --hash=sha256:ca1ddd1e0e4c227cf9e3e40a6afc6d106b3e70868fd2ac5798a22501271cd0c7
     # via -r requirements/dev.in
-python-dateutil==2.8.2 \
-    --hash=sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86 \
-    --hash=sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9
+python-dateutil==2.9.0.post0 \
+    --hash=sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3 \
+    --hash=sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427
     # via
     #   botocore
     #   faker
diff --git a/requirements.txt b/requirements.txt
index f75ca74f7..8a6039afe 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -518,9 +518,9 @@ pyproj==3.6.1 \
     # via
     #   -r requirements/base.in
     #   geopandas
-python-dateutil==2.8.2 \
-    --hash=sha256:0123cacc1627ae19ddf3c27a5de5bd67ee4586fbdd6440d9748f8abb483d3e86 \
-    --hash=sha256:961d03dc3453ebbc59dbdea9e4e11c5651520a876d0f4db161e8674aae935da9
+python-dateutil==2.9.0.post0 \
+    --hash=sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3 \
+    --hash=sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427
     # via
     #   botocore
     #   pandas