diff --git a/requirements.txt b/requirements.txt
index b5f06fe9..b77dcb34 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,5 +14,5 @@ pyyaml==6.0.1
     # via dials-data (pyproject.toml)
 requests==2.31.0
     # via dials-data (pyproject.toml)
-urllib3==2.2.3
+urllib3==2.6.3
     # via requests
diff --git a/requirements_dev.txt b/requirements_dev.txt
index ff4db0af..4d07d28f 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -24,5 +24,5 @@ pyyaml==6.0.1
     # via dials-data (pyproject.toml)
 requests==2.31.0
     # via dials-data (pyproject.toml)
-urllib3==2.2.3
+urllib3==2.6.3
     # via requests
diff --git a/requirements_doc.txt b/requirements_doc.txt
index 69084635..6e4d69c8 100644
--- a/requirements_doc.txt
+++ b/requirements_doc.txt
@@ -57,5 +57,5 @@ sphinxcontrib-qthelp==2.0.0
     # via sphinx
 sphinxcontrib-serializinghtml==2.0.0
     # via sphinx
-urllib3==2.2.3
+urllib3==2.6.3
     # via requests