diff --git a/.vscode/settings.json b/.vscode/settings.json
index 4a46f3b..5d877a9 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -5,5 +5,5 @@
     "python.defaultInterpreterPath": "python3",
     "modulename": "${workspaceFolderBasename}",
     "distname": "${workspaceFolderBasename}",
-    "moduleversion": "1.1.7"
+    "moduleversion": "1.1.8"
 }
\ No newline at end of file
diff --git a/RELEASE_NOTES.md b/RELEASE_NOTES.md
index 9b945b3..49b05b0 100644
--- a/RELEASE_NOTES.md
+++ b/RELEASE_NOTES.md
@@ -1,5 +1,11 @@
 # pygnssutils Release Notes
 
+### RELEASE 1.1.8
+
+ENHANCEMENTS:
+
+1. gnssmqttclient updated to support `pyspartn>=1.0.5` (see [pyspartn Release Notes](https://github.com/semuconsulting/pyspartn/blob/main/RELEASE_NOTES.md) for new functionality).
+
 ### RELEASE 1.1.7
 
 ENHANCEMENTS:
diff --git a/pyproject.toml b/pyproject.toml
index 8e35ebd..7714397 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "pygnssutils"
 authors = [{ name = "semuadmin", email = "semuadmin@semuconsulting.com" }]
 maintainers = [{ name = "semuadmin", email = "semuadmin@semuconsulting.com" }]
 description = "GNSS Command Line Utilities"
-version = "1.1.7"
+version = "1.1.8"
 license = { file = "LICENSE" }
 readme = "README.md"
 requires-python = ">=3.9"
@@ -37,7 +37,7 @@ dependencies = [
     "certifi>=2024.0.0",
     "paho-mqtt>=1.6.0",  # waiting for >=2.0.0 in Conda
     "pyserial>=3.5",
-    "pyspartn>=1.0.4",
+    "pyspartn>=1.0.5",
     "pyubx2>=1.2.48",
 ]
 
diff --git a/src/pygnssutils/_version.py b/src/pygnssutils/_version.py
index ea5621a..349da3f 100644
--- a/src/pygnssutils/_version.py
+++ b/src/pygnssutils/_version.py
@@ -8,4 +8,4 @@
 :license: BSD 3-Clause
 """
 
-__version__ = "1.1.7"
+__version__ = "1.1.8"
diff --git a/src/pygnssutils/gnssmqttclient.py b/src/pygnssutils/gnssmqttclient.py
index 63a8dce..ec40aee 100644
--- a/src/pygnssutils/gnssmqttclient.py
+++ b/src/pygnssutils/gnssmqttclient.py
@@ -42,6 +42,7 @@
 import paho.mqtt.client as mqtt
 from paho.mqtt import __version__ as PAHO_MQTT_VERSION
 from pyspartn import (
+    SPARTNDecryptionError,
     SPARTNMessageError,
     SPARTNParseError,
     SPARTNReader,
@@ -68,6 +69,8 @@
 TIMEOUT = 8
 DLGTSPARTN = "SPARTN Configuration"
 
+_global_timetags = {}  # for want of a better approach
+
 
 class GNSSMQTTClient:
     """
@@ -368,6 +371,7 @@ def on_message(client, userdata, msg):  # pylint: disable=unused-argument
         :param object msg: SPARTN or UBX message topic content
         """
 
+        global _global_timetags
         output = userdata["output"]
         app = userdata["app"]
         msglogger = userdata["logger"]
@@ -418,13 +422,25 @@ def do_write(raw: bytes, parsed: object):
                 decode=userdata["decode"],
                 key=userdata["key"],
                 basedate=userdata["basedate"],
+                timetags=_global_timetags,
             )
             try:
                 for raw, parsed in spr:
                     do_write(raw, parsed)
-            except (SPARTNMessageError, SPARTNParseError, SPARTNStreamError):
+                _global_timetags = spr.timetags
+            except (
+                SPARTNMessageError,
+                SPARTNParseError,
+                SPARTNStreamError,
+            ):
                 parsed = f"MQTT SPARTNParseError {msg.topic} {msg.payload}"
                 do_write(msg.payload, parsed)
+            except SPARTNDecryptionError:
+                parsed = (
+                    f"MQTT SPARTNDecryptionError - check decryption key and basedate"
+                    f" {msg.topic} {msg.payload}"
+                )
+                do_write(msg.payload, parsed)
 
     @staticmethod
     def on_error(userdata: dict, err: object):