diff --git a/requirements_dev.txt b/requirements_dev.txt
index 162213a314d779e4ae19fa2cc4cb5aec9ac0624a..e9790a9002383d642e6a60f05f0921e4cf867d4e 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,4 +1,4 @@
-python=3.9
+python==3.9
 matplotlib
 pandas
 pip