diff --git a/mbtrack2.yml b/mbtrack2.yml
index 059955435b085f9f8d09645d9abe96cc33353dbc..5d8716c4646eae3a9c3059312f3a9741480f98c4 100644
--- a/mbtrack2.yml
+++ b/mbtrack2.yml
@@ -8,7 +8,7 @@ dependencies:
   - mpi4py>=3.1
   - matplotlib>=3.5
   - seaborn>=0.12
-  - mpmath>=1.21
+  - mpmath>=1.2.1
   - pip
   - pip: 
     - accelerator-toolbox
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