diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index b10e1e6..355d2f2 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -2,7 +2,7 @@ channels:
   - conda-forge
 dependencies:
   - coverage
-  - lammps =2023.03.28
+  - lammps =2023.08.02
   - mpich
   - numpy =1.26.0
   - mpi4py =3.1.4
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index 14f95bb..ff22423 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -2,7 +2,7 @@ channels:
   - conda-forge
 dependencies:
   - coverage
-  - lammps =2023.03.28
+  - lammps =2023.08.02
   - openmpi
   - numpy =1.26.0
   - mpi4py =3.1.4