diff --git a/.gitignore b/.gitignore
index cd85c5f..d23fc2c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -154,3 +154,5 @@ cython_debug/
 
 **/.DS_Store
 
+.idea/workspace.xml
+.idea/BlockchainEngineering.iml
diff --git a/requirements.txt b/requirements.txt
index 0cc6a61..2080cf8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ pygraphviz==1.6
 PyYAML==5.4
 scipy==1.5.2
 seaborn==0.10.1
-simpy==4.0.1
+p2psimpy==0.1.0
 statsmodels==0.11.1
 tqdm==4.48.2
 widgetsnbextension==3.5.1