diff --git a/.envs/testenv-linux.yml b/.envs/testenv-linux.yml
index 1d1d1cf06..faa4402c3 100644
--- a/.envs/testenv-linux.yml
+++ b/.envs/testenv-linux.yml
@@ -28,5 +28,5 @@ dependencies:
       - Py-BOBYQA  # dev, tests
       - fides==0.7.4  # dev, tests
       - kaleido  # dev, tests
-      - simoptlib==1.0.2  # dev, tests
+      - simoptlib==1.0.0  # dev, tests
       - -e ../
diff --git a/.envs/testenv-others.yml b/.envs/testenv-others.yml
index c27d89c98..27ea7d173 100644
--- a/.envs/testenv-others.yml
+++ b/.envs/testenv-others.yml
@@ -27,5 +27,5 @@ dependencies:
       - Py-BOBYQA  # dev, tests
       - fides==0.7.4  # dev, tests
       - kaleido  # dev, tests
-      - simoptlib==1.0.2  # dev, tests
+      - simoptlib==1.0.0  # dev, tests
       - -e ../
diff --git a/environment.yml b/environment.yml
index 8d81a5cee..ab11497d8 100644
--- a/environment.yml
+++ b/environment.yml
@@ -45,5 +45,5 @@ dependencies:
       - gif[matplotlib]  # dev
       - kaleido  # dev, tests
       - pre-commit  # dev
-      - simoptlib==1.0.2  # dev, tests
+      - simoptlib==1.0.0  # dev, tests
       - -e .  # dev