diff --git a/.gitea/workflows/check.yml b/.gitea/workflows/check.yml
index a717756..eaa48a3 100644
--- a/.gitea/workflows/check.yml
+++ b/.gitea/workflows/check.yml
@@ -17,8 +17,11 @@ jobs:
         with:
           submodules: true
 
+      # The JDK comes from the runner's tool cache. `cache: gradle` stores Gradle's
+      # dependencies, Loom's Minecraft cache and the build cache in the runner's
+      # actions cache.
       - name: Set up Java 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: 21
diff --git a/.gitea/workflows/release.yml b/.gitea/workflows/release.yml
index f7afbf3..275c4d9 100644
--- a/.gitea/workflows/release.yml
+++ b/.gitea/workflows/release.yml
@@ -44,8 +44,11 @@ jobs:
           fi
           echo "Building Saturn Client $MOD_VERSION"
 
+      # The JDK comes from the runner's tool cache. `cache: gradle` stores Gradle's
+      # dependencies, Loom's Minecraft cache and the build cache in the runner's
+      # actions cache.
       - name: Set up Java 21
-        uses: actions/setup-java@v4
+        uses: actions/setup-java@v5
         with:
           distribution: temurin
           java-version: 21
diff --git a/gradle.properties b/gradle.properties
index b21030b..6a66e33 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,5 +1,7 @@
 org.gradle.jvmargs=-Xmx3G
 org.gradle.parallel=true
+# Reuse task outputs (e.g. compiled classes) when inputs haven't changed.
+org.gradle.caching=true
 
 # IntelliJ IDEA is not yet fully compatible with configuration cache, see: https://github.com/FabricMC/fabric-loom/issues/1349
 org.gradle.configuration-cache=false