diff --git a/letsencrypt-auto-source/letsencrypt-auto b/letsencrypt-auto-source/letsencrypt-auto
index 0ffe6c5f5..9703b3506 100755
--- a/letsencrypt-auto-source/letsencrypt-auto
+++ b/letsencrypt-auto-source/letsencrypt-auto
@@ -1212,9 +1212,9 @@ requests-toolbelt==0.8.0 \
 chardet==3.0.2 \
     --hash=sha256:4f7832e7c583348a9eddd927ee8514b3bf717c061f57b21dbe7697211454d9bb \
     --hash=sha256:6ebf56457934fdce01fb5ada5582762a84eed94cad43ed877964aebbdd8174c0
-urllib3==1.21.1 \
-    --hash=sha256:8ed6d5c1ff9d6ba84677310060d6a3a78ca3072ce0684cb3c645023009c114b1 \
-    --hash=sha256:b14486978518ca0901a76ba973d7821047409d7f726f22156b24e83fd71382a5
+urllib3==1.24.1 \
+    --hash=sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39 \
+    --hash=sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22
 certifi==2017.4.17 \
     --hash=sha256:f4318671072f030a33c7ca6acaef720ddd50ff124d1388e50c1bda4cbd6d7010 \
     --hash=sha256:f7527ebf7461582ce95f7a9e03dd141ce810d40590834f4ec20cddd54234c10a
diff --git a/letsencrypt-auto-source/pieces/dependency-requirements.txt b/letsencrypt-auto-source/pieces/dependency-requirements.txt
index 983d2bb95..eb297bc6e 100644
--- a/letsencrypt-auto-source/pieces/dependency-requirements.txt
+++ b/letsencrypt-auto-source/pieces/dependency-requirements.txt
@@ -188,9 +188,9 @@ requests-toolbelt==0.8.0 \
 chardet==3.0.2 \
     --hash=sha256:4f7832e7c583348a9eddd927ee8514b3bf717c061f57b21dbe7697211454d9bb \
     --hash=sha256:6ebf56457934fdce01fb5ada5582762a84eed94cad43ed877964aebbdd8174c0
-urllib3==1.21.1 \
-    --hash=sha256:8ed6d5c1ff9d6ba84677310060d6a3a78ca3072ce0684cb3c645023009c114b1 \
-    --hash=sha256:b14486978518ca0901a76ba973d7821047409d7f726f22156b24e83fd71382a5
+urllib3==1.24.1 \
+    --hash=sha256:61bf29cada3fc2fbefad4fdf059ea4bd1b4a86d2b6d15e1c7c0b582b9752fe39 \
+    --hash=sha256:de9529817c93f27c8ccbfead6985011db27bd0ddfcdb2d86f3f663385c6a9c22
 certifi==2017.4.17 \
     --hash=sha256:f4318671072f030a33c7ca6acaef720ddd50ff124d1388e50c1bda4cbd6d7010 \
     --hash=sha256:f7527ebf7461582ce95f7a9e03dd141ce810d40590834f4ec20cddd54234c10a