diff --git a/homeassistant/components/bsblan/manifest.json b/homeassistant/components/bsblan/manifest.json
index d5866bf8b42..5abb888513d 100644
--- a/homeassistant/components/bsblan/manifest.json
+++ b/homeassistant/components/bsblan/manifest.json
@@ -7,5 +7,5 @@
   "integration_type": "device",
   "iot_class": "local_polling",
   "loggers": ["bsblan"],
-  "requirements": ["python-bsblan==0.5.14"]
+  "requirements": ["python-bsblan==0.5.11"]
 }
diff --git a/requirements_all.txt b/requirements_all.txt
index ce37e1f72f1..1200b7c7352 100644
--- a/requirements_all.txt
+++ b/requirements_all.txt
@@ -2071,7 +2071,7 @@ python-awair==0.2.4
 python-blockchain-api==0.0.2
 
 # homeassistant.components.bsblan
-python-bsblan==0.5.14
+python-bsblan==0.5.11
 
 # homeassistant.components.clementine
 python-clementine-remote==1.0.1
diff --git a/requirements_test_all.txt b/requirements_test_all.txt
index 9c319ef31f0..2aacc289bd1 100644
--- a/requirements_test_all.txt
+++ b/requirements_test_all.txt
@@ -1539,7 +1539,7 @@ pytautulli==23.1.1
 python-awair==0.2.4
 
 # homeassistant.components.bsblan
-python-bsblan==0.5.14
+python-bsblan==0.5.11
 
 # homeassistant.components.ecobee
 python-ecobee-api==0.2.14
diff --git a/tests/components/bsblan/snapshots/test_diagnostics.ambr b/tests/components/bsblan/snapshots/test_diagnostics.ambr
index b172d26c249..2fff33de046 100644
--- a/tests/components/bsblan/snapshots/test_diagnostics.ambr
+++ b/tests/components/bsblan/snapshots/test_diagnostics.ambr
@@ -9,21 +9,21 @@
     }),
     'info': dict({
       'controller_family': dict({
-        'data_type': 0,
+        'dataType': 0,
         'desc': '',
         'name': 'Device family',
         'unit': '',
         'value': '211',
       }),
       'controller_variant': dict({
-        'data_type': 0,
+        'dataType': 0,
         'desc': '',
         'name': 'Device variant',
         'unit': '',
         'value': '127',
       }),
       'device_identification': dict({
-        'data_type': 7,
+        'dataType': 7,
         'desc': '',
         'name': 'Gerte-Identifikation',
         'unit': '',
@@ -32,42 +32,42 @@
     }),
     'state': dict({
       'current_temperature': dict({
-        'data_type': 0,
+        'dataType': 0,
         'desc': '',
         'name': 'Room temp 1 actual value',
         'unit': '°C',
         'value': '18.6',
       }),
       'hvac_action': dict({
-        'data_type': 1,
+        'dataType': 1,
         'desc': 'Raumtemp’begrenzung',
         'name': 'Status heating circuit 1',
         'unit': '',
         'value': '122',
       }),
       'hvac_mode': dict({
-        'data_type': 1,
+        'dataType': 1,
         'desc': 'Komfort',
         'name': 'Operating mode',
         'unit': '',
         'value': 'heat',
       }),
       'hvac_mode2': dict({
-        'data_type': 1,
+        'dataType': 1,
         'desc': 'Reduziert',
         'name': 'Operating mode',
         'unit': '',
         'value': '2',
       }),
       'room1_thermostat_mode': dict({
-        'data_type': 1,
+        'dataType': 1,
         'desc': 'Kein Bedarf',
         'name': 'Raumthermostat 1',
         'unit': '',
         'value': '0',
       }),
       'target_temperature': dict({
-        'data_type': 0,
+        'dataType': 0,
         'desc': '',
         'name': 'Room temperature Comfort setpoint',
         'unit': '°C',