diff --git a/environment.yml b/environment.yml
index 06dac566..cf6a5b35 100644
--- a/environment.yml
+++ b/environment.yml
@@ -18,7 +18,7 @@ dependencies:
   - openff-nagl-models>=0.1.2
   - openff-toolkit-base >=0.16.2
   - openff-units==0.3.1  # https://github.com/OpenFreeEnergy/openfe/pull/1374
-  - openmm ~=8.2.0  # omit 8.3.0 and 8.3.1 due to https://github.com/openmm/openmm/pull/5069, unpin once we've qualified 8.3.2
+  - openmm ~=8.4.0  # omit 8.3.0 and 8.3.1 due to https://github.com/openmm/openmm/pull/5069, unpin once we've qualified 8.3.2
   - openmmforcefields
   - openmmtools >=0.25.0
   - packaging