diff --git a/requirements-test.txt b/requirements-test.txt
index 03abfeea7..14a6f7961 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -1269,9 +1269,9 @@ ruamel-yaml-clib==0.2.15 \
     --hash=sha256:fd4c928ddf6bce586285daa6d90680b9c291cfd045fc40aad34e445d57b1bf51 \
     --hash=sha256:fe239bdfdae2302e93bd6e8264bd9b71290218fff7084a9db250b55caaccf43f
     # via -r requirements.txt
-s3transfer==0.16.1 \
-    --hash=sha256:61bcd00ccb83b21a0fe7e91a553fff9729d46c83b4e0106e7c314a733891f7c2 \
-    --hash=sha256:8e424355754b9ccb32467bdc568edf55be82692ef2002d934b1311dbb3b9e524
+s3transfer==0.19.0 \
+    --hash=sha256:777cc2415536f1debadb5c2ef7779275d0fc0fe0e042411cdd6caebeb2685262 \
+    --hash=sha256:ce436931687addc4c1712d52d40b32f53e88315723f107ffa20ba82b05a0f685
     # via
     #   -r requirements.txt
     #   boto3
diff --git a/requirements.txt b/requirements.txt
index f48c328d4..fbbf1c0bc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1062,9 +1062,9 @@ ruamel-yaml-clib==0.2.15 \
     --hash=sha256:fd4c928ddf6bce586285daa6d90680b9c291cfd045fc40aad34e445d57b1bf51 \
     --hash=sha256:fe239bdfdae2302e93bd6e8264bd9b71290218fff7084a9db250b55caaccf43f
     # via iib (setup.py)
-s3transfer==0.16.1 \
-    --hash=sha256:61bcd00ccb83b21a0fe7e91a553fff9729d46c83b4e0106e7c314a733891f7c2 \
-    --hash=sha256:8e424355754b9ccb32467bdc568edf55be82692ef2002d934b1311dbb3b9e524
+s3transfer==0.19.0 \
+    --hash=sha256:777cc2415536f1debadb5c2ef7779275d0fc0fe0e042411cdd6caebeb2685262 \
+    --hash=sha256:ce436931687addc4c1712d52d40b32f53e88315723f107ffa20ba82b05a0f685
     # via boto3
 semver==3.0.4 \
     --hash=sha256:9c824d87ba7f7ab4a1890799cec8596f15c1241cb473404ea1cb0c55e4b04746 \