diff --git a/.github/workflows/Compile Examples.yml b/.github/workflows/Compile Examples.yml
index c8d80b9..b06b32b 100644
--- a/.github/workflows/Compile Examples.yml	
+++ b/.github/workflows/Compile Examples.yml	
@@ -36,7 +36,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Compile examples
         uses: arduino/compile-sketches@main
diff --git a/.github/workflows/check-arduino.yml b/.github/workflows/check-arduino.yml
index 3e0d26c..adb330f 100644
--- a/.github/workflows/check-arduino.yml
+++ b/.github/workflows/check-arduino.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Arduino Lint
         uses: arduino/arduino-lint-action@v1
diff --git a/.github/workflows/spell-check.yml b/.github/workflows/spell-check.yml
index 3f6b03f..ef7d894 100644
--- a/.github/workflows/spell-check.yml
+++ b/.github/workflows/spell-check.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Spell check
         uses: codespell-project/actions-codespell@master
diff --git a/.github/workflows/sync-labels.yml b/.github/workflows/sync-labels.yml
index 94938f3..9cde1ac 100644
--- a/.github/workflows/sync-labels.yml
+++ b/.github/workflows/sync-labels.yml
@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Download JSON schema for labels configuration file
         id: download-schema
@@ -105,7 +105,7 @@ jobs:
           echo "::set-output name=flag::--dry-run"
 
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Download configuration files artifact
         uses: actions/download-artifact@v3
diff --git a/src/AirQualityClass.cpp b/src/AirQualityClass.cpp
index 359f350..8d1c73b 100644
--- a/src/AirQualityClass.cpp
+++ b/src/AirQualityClass.cpp
@@ -92,6 +92,7 @@ void AirQualityClass::end()
 
 float AirQualityClass::readVOC()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -101,13 +102,14 @@ float AirQualityClass::readVOC()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->breathVocEquivalent;
-    return reading;
+    reading = iaqSensor->breathVocEquivalent;
   }
+  return reading;
 }
 
 float AirQualityClass::readGasResistor()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -117,13 +119,14 @@ float AirQualityClass::readGasResistor()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->gasResistance;
-    return reading;
+    reading = iaqSensor->gasResistance;
   }
+  return reading;
 }
 
 float AirQualityClass::readIAQ()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -133,13 +136,14 @@ float AirQualityClass::readIAQ()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->iaq;
-    return reading;
+    reading = iaqSensor->iaq;
   }
+  return reading;
 }
 
 float AirQualityClass::readIAQAccuracy()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -149,13 +153,14 @@ float AirQualityClass::readIAQAccuracy()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->iaqAccuracy;
-    return reading;
+    reading = iaqSensor->iaqAccuracy;
   }
+  return reading;
 }
 
 float AirQualityClass::readStaticIAQ()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -165,14 +170,15 @@ float AirQualityClass::readStaticIAQ()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->staticIaq;
-    return reading;
+    reading = iaqSensor->staticIaq;
   }
+  return reading;
 }
 
 
 float AirQualityClass::readCO2()
 {
+  float reading = 0.0;
   if (_revision == BOARD_REVISION_2) {
     unsigned int time_Start = millis();
     while(millis() - time_Start < BME68X_TIMEOUT) {
@@ -182,8 +188,8 @@ float AirQualityClass::readCO2()
         checkIaqSensorStatus();
       }
     }
-    float reading = iaqSensor->co2Equivalent;
-    return reading;
+    reading = iaqSensor->co2Equivalent;
   }
+  return reading;
 }