diff --git a/requirements-dev.txt b/requirements-dev.txt
index a960986..46e4c2b 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -19,6 +19,7 @@ mypy==0.910
 pep8-naming==0.12.1
 safety==1.10.3
 types-requests==2.25.11
+types-simplejson==3.17.1
 
 # Code formatting tools
 autopep8==1.6.0