diff --git a/concurrency_vs_parallelism/requirements.txt b/concurrency_vs_parallelism/requirements.txt
index 32f6a37..769027f 100644
--- a/concurrency_vs_parallelism/requirements.txt
+++ b/concurrency_vs_parallelism/requirements.txt
@@ -6,5 +6,5 @@ chardet==3.0.4
 idna==2.6
 multidict==3.2.0
 requests==2.18.4
-urllib3==1.22
+urllib3==1.24.2
 yarl==0.12.0