diff --git a/environment-dev.yml b/environment-dev.yml
index e46e3b35b..0286bbb67 100644
--- a/environment-dev.yml
+++ b/environment-dev.yml
@@ -9,7 +9,7 @@ dependencies:
   - unyt<=2.9.2
   - boltons
   - lxml
-  - pydantic>1.8,<2.0
+  - pydantic=1.10.11
   - networkx
   - pytest
   - mbuild>=0.11.0
diff --git a/environment.yml b/environment.yml
index 0046582ea..c7ef337f2 100644
--- a/environment.yml
+++ b/environment.yml
@@ -9,7 +9,7 @@ dependencies:
   - unyt<=2.9.2
   - boltons
   - lxml
-  - pydantic>1.8,<2.0
+  - pydantic=1.10.11
   - networkx
   - ele>=0.2.0
   - foyer>=0.11.3