diff --git a/.github/actions/gradle-and-sha/action.yml b/.github/actions/gradle-and-sha/action.yml
index 355c90c73..f68a6ee66 100644
--- a/.github/actions/gradle-and-sha/action.yml
+++ b/.github/actions/gradle-and-sha/action.yml
@@ -22,17 +22,11 @@ runs:
 
     - name: "Rename output file"
       shell: bash
-      run: mv ${{ inputs.intermediate-filepath }} ${{ inputs.final-filepath }}
+      run: |
+        ls build/*/*
+        mv ${{ inputs.intermediate-filepath }} ${{ inputs.final-filepath }}
 
-    - name: "Generate SHA512 for Linux"
-      shell: bash
-      if: runner.os == 'Linux'
-      run: sha512sum ${{ inputs.final-filepath }} > ${{ inputs.final-filepath }}.sha512
-    - name: "Generate SHA512 for Windows"
-      shell: bash
-      if: runner.os == 'Windows'
-      run: certutil -hashfile ${{ inputs.final-filepath }} SHA512 >> ${{ inputs.final-filepath }}.sha512
-    - name: "Generate SHA512 for OSX"
-      shell: bash
-      if: runner.os == 'macOS'
-      run: openssl dgst -sha512 > ${{ inputs.final-filepath }}.sha512
+    - name: "Generate SHA512"
+      uses: ./.github/actions/sha
+      with:
+        filepath: ${{ inputs.final-filepath }}
diff --git a/.github/actions/sha/action.yml b/.github/actions/sha/action.yml
new file mode 100644
index 000000000..2682b0228
--- /dev/null
+++ b/.github/actions/sha/action.yml
@@ -0,0 +1,24 @@
+name: "Create SHA512 for a file"
+description: "Cross-platform helper: creates SHA512"
+
+inputs:
+  filepath:
+    description: "The input file path"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - name: "Generate SHA512 for Linux"
+      shell: bash
+      if: runner.os == 'Linux'
+      run: sha512sum ${{ inputs.filepath }} > ${{ inputs.filepath }}.sha512
+    - name: "Generate SHA512 for Windows"
+      shell: bash
+      if: runner.os == 'Windows'
+      run: certutil -hashfile ${{ inputs.filepath }} SHA512 >> ${{ inputs.filepath }}.sha512
+    - name: "Generate SHA512 for macOS"
+      shell: bash
+      if: runner.os == 'macOS'
+      run: openssl dgst -sha512 > ${{ inputs.filepath }}.sha512
+
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1617c1fe1..42461bb6a 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -3,11 +3,11 @@ name: "Generate Releases"
 on:
   release:
     types: [ published ]
-## To test this workflow without creating a release, uncomment the following and add a branch name (making sure "push"
-##  is at the same indent level as "release":
-#  push:
-#    branches:
-#      - 'branch-name'
+# To test this workflow without creating a release, uncomment the following and add a branch name (making sure "push"
+#  is at the same indent level as "release":
+  push:
+    branches:
+      - 'feature/issue-756_airgap'
 
 jobs:
   release:
@@ -50,7 +50,7 @@ jobs:
           if [ ${{ runner.os }} == 'Windows' ]; then
             echo "FILEPATH=build/jpackage/RCTab-1.3.999.exe" >> $GITHUB_OUTPUT
           elif [ ${{ runner.os }} == 'Linux' ]; then
-            echo "FILEPATH=build/jpackage/rctab_1.3.999-1_amd64.deb" >> $GITHUB_OUTPUT
+            echo "FILEPATH=build/jpackage/rctab_1.3.999_amd64.deb" >> $GITHUB_OUTPUT
           else
             echo "FILEPATH=build/jpackage/RCTab-1.3.999.dmg" >> $GITHUB_OUTPUT
           fi
@@ -77,6 +77,39 @@ jobs:
           intermediate-filepath: build/rcv.zip
           final-filepath: ${{ steps.zipfn.outputs.FILEPATH }}
 
+      - name: "Create caches filename"
+        id: cachefn
+        shell: bash
+        run: |
+          echo "DEPENDENCY_FILEPATH=dependency.${{ runner.os }}.zip" >> $GITHUB_OUTPUT
+          echo "PLUGIN_FILEPATH=plugin.${{ runner.os }}.zip" >> $GITHUB_OUTPUT
+
+      - name: "Create dependency zip"
+        uses: thedoctor0/zip-release@0.7.5
+        with:
+          type: "zip"
+          command: ./gradlew copyLibs
+          filename: ${{steps.cachefn.outputs.DEPENDENCY_FILEPATH}}
+          path: ".dependencycache"
+
+      - name: "Create plugins zip"
+        uses: thedoctor0/zip-release@0.7.5
+        with:
+          type: "zip"
+          command: ./gradlew assemble
+          filename: ${{steps.cachefn.outputs.PLUGIN_FILEPATH}}
+          path: "~/.gradle/caches"
+
+      - name: "Generate SHA512 for dependency cache"
+        uses: ./.github/actions/sha
+        with:
+          filepath: ${{steps.cachefn.outputs.DEPENDENCY_FILEPATH}}
+
+      - name: "Generate SHA512 for plugins cache"
+        uses: ./.github/actions/sha
+        with:
+          filepath: ${{steps.cachefn.outputs.PLUGIN_FILEPATH}}
+
       - name: "Prepare keychain"
         if: matrix.os == 'macOS-latest'
         env:
@@ -132,6 +165,10 @@ jobs:
             ${{ github.workspace }}/${{ steps.zipfn.outputs.FILEPATH }}.sha512
             ${{ github.workspace }}/${{ steps.exefn.outputs.FILEPATH }}
             ${{ github.workspace }}/${{ steps.exefn.outputs.FILEPATH }}.sha512
+            ${{ github.workspace }}/dependencycache.zip
+            ${{ github.workspace }}/dependencycache.zip.sha512
+            ${{ github.workspace }}/plugincache.zip
+            ${{ github.workspace }}/plugincache.zip.sha512
           retention-days: 90
 
       - name: "Upload binaries to release"
diff --git a/build.gradle b/build.gradle
index 46821cfd5..049453211 100644
--- a/build.gradle
+++ b/build.gradle
@@ -15,14 +15,24 @@ repositories {
     mavenCentral()
 }
 
+// Caching dependencies for a fully-offline build
+def DEPENDENCY_CACHE_DIR = "$projectDir/.dependencycache/"
+
 dependencies {
-    implementation 'commons-cli:commons-cli:1.5.0'
-    implementation 'org.apache.commons:commons-csv:1.10.0'
-    implementation 'org.apache.poi:poi-ooxml:5.2.3'
-    implementation 'com.fasterxml.jackson.core:jackson-core:2.15.2'
-    implementation 'com.fasterxml.jackson.core:jackson-annotations:2.15.2'
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.15.2'
-    implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.15.2'
+    if (gradle.startParameter.isOffline()) {
+        implementation fileTree(dir: DEPENDENCY_CACHE_DIR)
+    } else {
+        implementation 'commons-cli:commons-cli:1.5.0'
+        implementation 'org.apache.commons:commons-csv:1.10.0'
+        implementation 'org.apache.poi:poi-ooxml:5.2.3'
+        implementation 'com.fasterxml.jackson.core:jackson-core:2.15.2'
+        implementation 'com.fasterxml.jackson.core:jackson-annotations:2.15.2'
+        implementation 'com.fasterxml.jackson.core:jackson-databind:2.15.2'
+        implementation 'com.fasterxml.jackson.dataformat:jackson-dataformat-xml:2.15.2'
+        implementation "com.github.spotbugs:spotbugs:4.8.3"
+
+    }
+
     testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.3'
     testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.3'
 }
@@ -235,3 +245,25 @@ tasks.jlink.doLast {
         into JLINK_DIR + "/sample_input"
     }
 }
+
+// Tooling to copy dependencies for a fully-offline build
+configurations {
+  cacheableImplementation.extendsFrom implementation
+}
+
+task deleteLibraryCache(type: Delete) {
+    delete DEPENDENCY_CACHE_DIR
+}
+
+task copyLibs(type: Copy, dependsOn: 'deleteLibraryCache') {
+    from configurations.cacheableImplementation
+    into DEPENDENCY_CACHE_DIR
+}
+
+// Necessary for offline builds to succeed
+tasks.withType(Tar) {
+   duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
+tasks.withType(Zip) {
+   duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}