diff --git a/src/openmc_data/generate/generate_jeff33.py b/src/openmc_data/generate/generate_jeff33.py
index e618227..43c4e8a 100755
--- a/src/openmc_data/generate/generate_jeff33.py
+++ b/src/openmc_data/generate/generate_jeff33.py
@@ -79,9 +79,11 @@ def main():
         (base_endf, 'ENDF-B-VIII.0_atomic_relax.zip', 'e04d50098cb2a7e4fe404ec4071611cc'),
     ]
 
+    # TODO: these individual TENDL neutron file endpoints return 404 on the
+    # new tendl.imperial.ac.uk site. Re-enable once the files are available.
     tendl_files = [
-        'https://tendl.web.psi.ch/tendl_2019/neutron_file/C/C013/lib/endf/n-C013.tendl',
-        'https://tendl.web.psi.ch/tendl_2019/neutron_file/O/O017/lib/endf/n-O017.tendl',
+        # 'https://tendl.imperial.ac.uk/tendl_2019/neutron_file/C/C013/lib/endf/n-C013.tendl',
+        # 'https://tendl.imperial.ac.uk/tendl_2019/neutron_file/O/O017/lib/endf/n-O017.tendl',
     ]
 
     neutron_dir = Path('endf6')
diff --git a/src/openmc_data/other/convert_tendl_rand.py b/src/openmc_data/other/convert_tendl_rand.py
index d68531c..57ffd7e 100755
--- a/src/openmc_data/other/convert_tendl_rand.py
+++ b/src/openmc_data/other/convert_tendl_rand.py
@@ -124,15 +124,15 @@ def main():
 
     release_details = {
         "ENDF2017": {
-            "base_url": "https://tendl.web.psi.ch/tendl_2017/tar_files/",
+            "base_url": "https://tendl.imperial.ac.uk/tendl_2017/tar_files/",
             "ending": ".random.tgz",
         },
         "ENDF2015": {
-            "base_url": "https://tendl.web.psi.ch/tendl_2015/tar_files/",
+            "base_url": "https://tendl.imperial.ac.uk/tendl_2015/tar_files/",
             "ending": ".random.tgz",
         },
         "ACE2015": {
-            "base_url": "https://tendl.web.psi.ch/tendl_2015/tar_files/",
+            "base_url": "https://tendl.imperial.ac.uk/tendl_2015/tar_files/",
             "ending": ".10.2016.tgz",
         },
     }
diff --git a/src/openmc_data/urls.py b/src/openmc_data/urls.py
index f6d19cd..660f9ce 100644
--- a/src/openmc_data/urls.py
+++ b/src/openmc_data/urls.py
@@ -3,7 +3,7 @@
         "2015": {
             "neutron": {
                 "ace": {
-                    "base_url": "https://tendl.web.psi.ch/tendl_2015/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2015/tar_files/",
                     "compressed_files": ["ACE-n.tgz"],
                     "neutron_files": "neutron_file/*/*/lib/endf/*-n.ace",
                     "metastables": "neutron_file/*/*/lib/endf/*m-n.ace",
@@ -15,7 +15,7 @@
         "2017": {
             "neutron": {
                 "ace":{
-                    "base_url": "https://tendl.web.psi.ch/tendl_2017/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2017/tar_files/",
                     "compressed_files": ["tendl17c.tar.bz2"],
                     "neutron_files": "ace-17/*",
                     "metastables": "ace-17/*m",
@@ -27,7 +27,7 @@
         "2019": {
             "neutron": {
                 "ace": {
-                    "base_url": "https://tendl.web.psi.ch/tendl_2019/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2019/tar_files/",
                     "compressed_files": ["tendl19c.tar.bz2"],
                     "neutron_files": "tendl19c/*",
                     "metastables": "tendl19c/*m",
@@ -39,7 +39,7 @@
         "2021": {
             "neutron": {
                 "ace": {
-                    "base_url": "https://tendl.web.psi.ch/tendl_2021/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2021/tar_files/",
                     "compressed_files": ["tendl21c.tar.bz2"],
                     "neutron_files": "tendl21c/*",
                     "metastables": "tendl21c/*m",
@@ -51,7 +51,7 @@
         "2023": {
             "neutron": {
                 "endf": {
-                    "base_url": "https://tendl.web.psi.ch/tendl_2023/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2023/tar_files/",
                     "compressed_files": ["TENDL-n.2024new.tgz"],
                     "endf_files": "n-*.tendl",
                     "metastables": "n-*m.tendl",
@@ -63,7 +63,7 @@
         "2025": {
             "neutron": {
                 "endf": {
-                    "base_url": "https://tendl.web.psi.ch/tendl_2025/tar_files/",
+                    "base_url": "https://tendl.imperial.ac.uk/tendl_2025/tar_files/",
                     "compressed_files": ["TENDL-n.tgz"],
                     "endf_files": "n-*.tendl",
                     "metastables": "n-*m.tendl",
diff --git a/src/openmc_data/urls_chain.py b/src/openmc_data/urls_chain.py
index b54056c..5dba0c1 100644
--- a/src/openmc_data/urls_chain.py
+++ b/src/openmc_data/urls_chain.py
@@ -48,25 +48,25 @@
     'tendl': {
         '2015': {
             'neutron':{
-                'base_url': 'https://tendl.web.psi.ch/tendl_2015/tar_files/',
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2015/tar_files/',
                 'compressed_files': ['TENDL-n.tgz'],
             }
         },
         '2017': {
             'neutron':{
-                'base_url': 'https://tendl.web.psi.ch/tendl_2017/tar_files/',
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2017/tar_files/',
                 'compressed_files': ['TENDL-n.tgz'],
             }
         },
         '2019': {
             'neutron':{
-                'base_url': 'https://tendl.web.psi.ch/tendl_2019/tar_files/',
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2019/tar_files/',
                 'compressed_files': ['TENDL-n.tgz'],
             }
         },
         '2021': {
             'neutron':{
-                'base_url': 'https://tendl.web.psi.ch/tendl_2021/tar_files/',
+                'base_url': 'https://tendl.imperial.ac.uk/tendl_2021/tar_files/',
                 'compressed_files': ['TENDL-n.tgz'],
             }
         }
diff --git a/src/openmc_data/urls_h5.py b/src/openmc_data/urls_h5.py
index 6d2c02e..f88054b 100644
--- a/src/openmc_data/urls_h5.py
+++ b/src/openmc_data/urls_h5.py
@@ -20,7 +20,7 @@
     "tendl": {
         "2019": {
             "neutron": {
-                "base_url": "https://tendl.web.psi.ch/tendl_2019/tar_files/",
+                "base_url": "https://tendl.imperial.ac.uk/tendl_2019/tar_files/",
                 "compressed_files": ["tendl19_hdf5.tar.bz2"],
                 "compressed_file_size": 1.3,
                 "uncompressed_file_size": 2.5,
@@ -28,7 +28,7 @@
         },
         "2021": {
             "neutron": {
-                "base_url": "https://tendl.web.psi.ch/tendl_2021/tar_files/",
+                "base_url": "https://tendl.imperial.ac.uk/tendl_2021/tar_files/",
                 "compressed_files": ["tendl21_hdf5.tar.bz2"],
                 "compressed_file_size": 1.3,
                 "uncompressed_file_size": 2.5,