diff --git a/simulations/unity_poisson_sim/requirements.txt b/simulations/unity_poisson_sim/requirements.txt
index b4367e5..55a0c3c 100644
--- a/simulations/unity_poisson_sim/requirements.txt
+++ b/simulations/unity_poisson_sim/requirements.txt
@@ -8,7 +8,7 @@ decorator==4.3.0
 ed25519==1.4
 idna==2.8
 ipykernel==5.1.0
-ipython==7.2.0
+ipython==7.16.3
 ipython-genutils==0.2.0
 jedi==0.13.2
 jupyter-client==5.2.4