diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index de1ae55..68a975d 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -7,9 +7,17 @@ RUN apt-get update && export DEBIAN_FRONTEND=noninteractive \
     python3-pip \
     git \
     curl \
+    fish \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*
 
+RUN mkdir -p /home/vscode/.local/share/CMakeTools \
+&& chown -R vscode:vscode /home/vscode/.local/share/CMakeTools
+
+RUN mkdir -p /home/vscode/.ssh \
+    && chown vscode:vscode /home/vscode/.ssh \
+    && chmod 700 /home/vscode/.ssh
+
 # Install arduino-cli
 RUN curl -fsSL https://raw.githubusercontent.com/arduino/arduino-cli/master/install.sh | sh
 
@@ -22,16 +30,16 @@ ENV PATH="/usr/local/bin:${PATH}"
 # Create workspace directory
 WORKDIR /workspace
 
-# Copy arduino-cli configuration
+# Copy arduino-cli configuration (customise to your actual path)
 COPY arduino-cli.yaml /root/.arduino15/arduino-cli.yaml
 
 # Install build essentials
-RUN apt-get update && apt-get install -y build-essential
+RUN apt-get update && apt-get install -y build-essential && rm -rf /var/lib/apt/lists/*
 
-# Install Arduino cores for ESP8266 and ESP32
+# (Optional) Install Arduino cores for ESP8266 and ESP32 if needed
 RUN arduino-cli core install esp8266:esp8266 esp32:esp32
 
-# Install only required dependencies for DallasTemperature library
+# Install only required dependencies for DallasTemperature library and others
 RUN arduino-cli lib install \
     "OneWire" \
     "ArduinoUnit"  # For testing
@@ -43,13 +51,27 @@ RUN arduino-cli lib list
 COPY update-libraries.sh /usr/local/bin/
 RUN chmod +x /usr/local/bin/update-libraries.sh
 
-# Add aliases for build operations
+# Add aliases for build operations (for Bash)
 RUN echo 'alias arduino-build="./build.sh build"' >> /home/vscode/.bashrc && \
     echo 'alias arduino-test="./build.sh test"' >> /home/vscode/.bashrc && \
     echo 'alias arduino-build-test="./build.sh all"' >> /home/vscode/.bashrc
 
-# Add welcome message to .bashrc
+# Add a welcome message to .bashrc
 RUN echo '\n# Welcome to the dev container! Here are some useful aliases:' >> /home/vscode/.bashrc && \
     echo 'echo "  - arduino-build: Build the project"' >> /home/vscode/.bashrc && \
     echo 'echo "  - arduino-test: Run tests for the project"' >> /home/vscode/.bashrc && \
     echo 'echo "  - arduino-build-test: Build and test the project"' >> /home/vscode/.bashrc
+
+# (Optional) Add fish-specific configuration if desired
+# For example, you might add an alias file or welcome message for fish:
+RUN mkdir -p /home/vscode/.config/fish && \
+    echo 'set -gx PATH /usr/local/bin $PATH' >> /home/vscode/.config/fish/config.fish && \
+    echo '# Welcome to the Fish shell inside the dev container!' >> /home/vscode/.config/fish/config.fish
+
+# Generate SSH keys and set proper ownership and permissions
+RUN if [ ! -f /home/vscode/.ssh/id_rsa ]; then \
+        ssh-keygen -t rsa -b 4096 -N "" -C "devcontainer@local" -f /home/vscode/.ssh/id_rsa && \
+        chmod 600 /home/vscode/.ssh/id_rsa && \
+        chmod 644 /home/vscode/.ssh/id_rsa.pub && \
+        chown vscode:vscode /home/vscode/.ssh/id_rsa /home/vscode/.ssh/id_rsa.pub ; \
+    fi
diff --git a/.devcontainer/arduino-cli.yaml b/.devcontainer/arduino-cli.yaml
index 6f63e9e..b776e10 100644
--- a/.devcontainer/arduino-cli.yaml
+++ b/.devcontainer/arduino-cli.yaml
@@ -12,4 +12,8 @@ compile:
 unittest:
   # These dependent libraries will be installed
   libraries:
-    - "OneWire"
\ No newline at end of file
+    - "OneWire"
+board_manager:
+  additional_urls:
+    - https://arduino.esp8266.com/stable/package_esp8266com_index.json
+    - https://dl.espressif.com/dl/package_esp32_index.json
\ No newline at end of file
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 2e43242..98325ed 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -1,15 +1,23 @@
 {
     "name": "Arduino Library Development",
     "dockerFile": "Dockerfile",
+    "mounts": [
+      "source=devcontainer_ssh,target=/home/vscode/.ssh,type=volume",
+      "source=devcontainer_bash_history,target=/home/vscode/.bash_history,type=volume",
+      "source=devcontainer_fish_history,target=/home/vscode/.local/share/fish/fish_history,type=volume"
+    ],
     "customizations": {
-        "vscode": {
-            "extensions": [
-                "vsciot-vscode.vscode-arduino",
-                "ms-vscode.cpptools"
-            ]
-        }
+      "vscode": {
+        "extensions": [
+          "vsciot-vscode.vscode-arduino",
+          "ms-vscode.cpptools",
+          "ms-azuretools.vscode-docker",
+          "yzhang.markdown-all-in-one"
+        ]
+      }
     },
     "postCreateCommand": "arduino-cli core install arduino:avr && arduino-cli lib install ArduinoUnit && /usr/local/bin/update-libraries.sh",
     "updateContentCommand": "/usr/local/bin/update-libraries.sh",
     "remoteUser": "vscode"
-}
+  }
+  
\ No newline at end of file
diff --git a/DallasTemperature.h b/DallasTemperature.h
index db0f9ce..675e00d 100644
--- a/DallasTemperature.h
+++ b/DallasTemperature.h
@@ -1,7 +1,7 @@
 #ifndef DallasTemperature_h
 #define DallasTemperature_h
 
-#define DALLASTEMPLIBVERSION "4.0.3"
+#define DALLASTEMPLIBVERSION "4.0.4"
 
 // Configuration
 #ifndef REQUIRESNEW
diff --git a/library.json b/library.json
index af6e85c..a5d8b09 100644
--- a/library.json
+++ b/library.json
@@ -32,7 +32,7 @@
   {
     "paulstoffregen/OneWire": "^2.3.5"
   },
-  "version": "4.0.3",
+  "version": "4.0.4",
   "frameworks": "arduino",
   "platforms": "*"
 }
diff --git a/library.properties b/library.properties
index c94891c..ecf548f 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
 name=DallasTemperature
-version=4.0.3
+version=4.0.4
 author=Miles Burton <mail@milesburton.com>, Tim Newsome <nuisance@casualhacker.net>, Guil Barros <gfbarros@bappos.com>, Rob Tillaart <rob.tillaart@gmail.com>
 maintainer=Miles Burton <mail@milesburton.com>
 sentence=Arduino library for Dallas/Maxim temperature ICs