diff --git a/setup.py b/setup.py
index 1b6a832d..6d4e13aa 100644
--- a/setup.py
+++ b/setup.py
@@ -17,7 +17,7 @@
 ]
 
 DEV_REQUIRES = [
-    "pyro-ppl=1.8.5",
+    "pyro-ppl==1.8.5",
     "torch",
     "plotly.express",
     "scipy",