diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 168cc237..9e9334f7 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -52,17 +52,17 @@ jobs:
 
     # https://docs.github.com/en/actions/learn-github-actions/expressions
     - if: matrix.language == 'java'
-      name: Set up JDK 17
-      uses: actions/setup-java@v3
+      name: Set up JDK 21
+      uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
-        java-version: 17
+        java-version: 21
     - if: matrix.language == 'java'
       uses: actions/setup-node@v3
       with:
         node-version: 16
     - if: matrix.language == 'java'
-      name: Install dependencies
+      name: Install npm dependencies
       run: (cd web && npm install)
 
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
diff --git a/.github/workflows/docker-build.yml b/.github/workflows/docker-build.yml
index bd939069..f8da13bf 100644
--- a/.github/workflows/docker-build.yml
+++ b/.github/workflows/docker-build.yml
@@ -35,12 +35,12 @@ jobs:
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
         with:
           # https://github.com/marketplace/actions/setup-java-jdk#supported-distributions
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - if: matrix.data.image-name == 'solarthing-server'
         uses: actions/setup-node@v3
         with:
diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index b8db63fa..70d8c83b 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -9,15 +9,15 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 17
-      uses: actions/setup-java@v3
+    - name: Set up JDK 21
+      uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
-        java-version: 17
+        java-version: 21
     - uses: actions/setup-node@v3
       with:
         node-version: 16
-    - name: Install dependencies
+    - name: Install npm dependencies
       run: (cd web && npm install)
     - name: Build with Gradle
       run: ./gradlew build
diff --git a/.github/workflows/release-upload.yml b/.github/workflows/release-upload.yml
index 7fe9d093..a6b5ed15 100644
--- a/.github/workflows/release-upload.yml
+++ b/.github/workflows/release-upload.yml
@@ -23,15 +23,15 @@ jobs:
     needs: shared-outputs
     steps:
       - uses: actions/checkout@v4
-      - name: Set up JDK 17
-        uses: actions/setup-java@v3
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
         with:
           distribution: 'temurin'
-          java-version: 17
+          java-version: 21
       - uses: actions/setup-node@v3
         with:
           node-version: 16
-      - name: Install dependencies
+      - name: Install npm dependencies
         run: (cd web && npm install)
       - name: Build with Gradle
         run: ./gradlew build client:shadowJar -x test
diff --git a/.github/workflows/spotless.yml b/.github/workflows/spotless.yml
index d57bc711..92378343 100644
--- a/.github/workflows/spotless.yml
+++ b/.github/workflows/spotless.yml
@@ -10,9 +10,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Set up JDK 17
-      uses: actions/setup-java@v3
+      uses: actions/setup-java@v4
       with:
         distribution: 'temurin'
-        java-version: 17
+        java-version: 21
     - name: Spotless check
       run: ./gradlew spotlessCheck
diff --git a/other/docs/installing_java_11_adv.md b/other/docs/installing_java_11_adv.md
index 99c12c35..f8d06542 100644
--- a/other/docs/installing_java_11_adv.md
+++ b/other/docs/installing_java_11_adv.md
@@ -1,4 +1,8 @@
-## Installing Java 11 on RPi1 or RPi0
+## Installing Java 11 on RPi1 or RPi0 (**Outdated Documentation**)
+
+NOTE: This page was originally created so that people could install Java 11 on RPi1 or RPi0.
+SolarThing no longer supports these devices!
+
 If you have an RPi1 or RPi0, they both have ARMv6 processors, so you need to install Java 11 differently.
 
 NOTE: You don't have to use Java 11. Using Java 8 with SolarThing is perfectly fine. **Go [here](./installing_java.md)