diff --git a/requirements/dev.in b/requirements/dev.in
index f8cb874b7b..443d05d9ca 100644
--- a/requirements/dev.in
+++ b/requirements/dev.in
@@ -8,7 +8,7 @@
 moto==1.3.3
 
 # Needed for running tools/run-dev.py
-Twisted==17.9.0
+Twisted==18.4.0
 
 # Needed for documentation links test
 Scrapy==1.5.0
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 7d6f040976..695399af39 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -167,7 +167,7 @@ tornado==4.5.3
 traitlets==4.3.2          # via ipython
 transifex-client==0.12.5
 twilio==6.13.0
-twisted==17.9.0
+twisted==18.4.0
 typed-ast==1.1.0          # via mypy
 typing==3.6.4
 uritemplate==3.0.0