diff --git a/.ci_support/environment-mpich.yml b/.ci_support/environment-mpich.yml
index db5fb80..ca14d95 100644
--- a/.ci_support/environment-mpich.yml
+++ b/.ci_support/environment-mpich.yml
@@ -2,7 +2,7 @@ channels:
   - conda-forge
 dependencies:
   - coverage
-  - lammps =2023.08.02
+  - lammps =2023.11.21
   - mpich
   - numpy =1.26.3
   - mpi4py =3.1.5
diff --git a/.ci_support/environment-openmpi.yml b/.ci_support/environment-openmpi.yml
index 1c70135..17ef4e5 100644
--- a/.ci_support/environment-openmpi.yml
+++ b/.ci_support/environment-openmpi.yml
@@ -2,7 +2,7 @@ channels:
   - conda-forge
 dependencies:
   - coverage
-  - lammps =2023.08.02
+  - lammps =2023.11.21
   - openmpi
   - numpy =1.26.3
   - mpi4py =3.1.5
diff --git a/tests/test_base.py b/tests/test_base.py
index 51869a2..a1b256a 100644
--- a/tests/test_base.py
+++ b/tests/test_base.py
@@ -98,7 +98,7 @@ def test_cmdarg_options(self):
         self.assertTrue(os.path.isfile(self.citation_file))
 
     def test_version(self):
-        self.assertTrue(self.lmp.version in [20220623, 20230802])
+        self.assertTrue(self.lmp.version in [20220623, 20230802, 20231121])
 
     def test_extract_global(self):
         self.assertEqual(
diff --git a/tests/test_concurrent.py b/tests/test_concurrent.py
index 7931f2c..bd4525f 100644
--- a/tests/test_concurrent.py
+++ b/tests/test_concurrent.py
@@ -94,7 +94,7 @@ def test_cmdarg_options(self):
         self.assertTrue(os.path.isfile(self.citation_file))
 
     def test_version(self):
-        self.assertTrue(self.lmp.version.result() in [20220623, 20230802])
+        self.assertTrue(self.lmp.version.result() in [20220623, 20230802, 20231121])
 
     def test_extract_global(self):
         self.assertEqual(