diff --git a/api/requirements/local.txt b/api/requirements/local.txt
index de3fdfb7a..f1525516e 100644
--- a/api/requirements/local.txt
+++ b/api/requirements/local.txt
@@ -10,7 +10,7 @@ django-debug-toolbar~=2.2
 # improved REPL
 ipdb~=0.11
 prompt_toolkit~=2.0
-black
+black==19.10b0
 #profiling
 
 asynctest~=0.12