diff --git a/CHANGELOG.md b/CHANGELOG.md
index f0ebdfe..ca432e9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,6 @@
 	OpenSeizureDetector Android App - Change Log
 	============================================
-
+    V4.0.6 - fixed issue with O2sat data not being recorded to database
     V4.0.5 - Added support for 3D data logging
             - Fixed issue with seizure reporting crashing if quotation marks included in text.
     V4.0.4 - Added support for Data Sharing system
diff --git a/app/release/app-release-4.0.5.apk b/app/release/app-release-4.0.6.apk
similarity index 88%
rename from app/release/app-release-4.0.5.apk
rename to app/release/app-release-4.0.6.apk
index 4b70c48..dc4e325 100644
Binary files a/app/release/app-release-4.0.5.apk and b/app/release/app-release-4.0.6.apk differ
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5df9440..d25abd9 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -2,8 +2,8 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools"
     package="uk.org.openseizuredetector"
-    android:versionCode="101"
-    android:versionName="4.0.5">
+    android:versionCode="102"
+    android:versionName="4.0.6">
     <!-- android:allowBackup="false" -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
diff --git a/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java b/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
index c274af5..2b9a1ae 100644
--- a/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
+++ b/app/src/main/java/uk/org/openseizuredetector/SdDataSource.java
@@ -272,7 +272,7 @@ public abstract class SdDataSource {
                     mSdData.mHR = -1;
                 }
                 try {
-                    mSdData.mO2Sat = dataObject.getDouble("O2Sat");
+                    mSdData.mO2Sat = dataObject.getDouble("O2sat");
                 } catch (JSONException e) {
                     // if we get 'null' O2 Saturation (For example if the oxygen sensor is not working)
                     mSdData.mO2Sat = -1;
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 2fd6d0d..f128438 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -3,6 +3,7 @@
     <string name="app_name">OpenSeizureDetector</string>
     <string name="changelog">
         "\n
+        \nV4.0.5 - fixed issue with O2 saturation data not being recorded to data sharing database.
         \nV4.0.4
           - Introduced the &lt;b>Data Sharing&lt;/b> feature to allow users to share their seizure and false alarm data
         with researchers to help improve the system.&lt;br/>