diff --git a/.github/actions/setup-node/action.yml b/.github/actions/setup-node/action.yml
index 3a16aff2a..7fe7b1c5b 100644
--- a/.github/actions/setup-node/action.yml
+++ b/.github/actions/setup-node/action.yml
@@ -20,11 +20,17 @@ runs:
           ~/.cargo
         key: ${{ hashFiles('.github/workflows/cache.yml') }}-${{ runner.os }}-${{ env.OS_ARCH }}
     - uses: actions/cache@v4
-      # Cache first-party code dependencies
+      # Cache Rust dependencies
       with:
         path: |
           .cargo
         key: ${{ hashFiles('.github/workflows/cache.yml') }}-${{ runner.os }}-${{ env.OS_ARCH }}-${{ hashFiles('sources/Cargo.lock') }}
+    - uses: actions/cache@v4
+      # Cache Go dependencies
+      with:
+        path: |
+          .gomodcache
+        key: ${{ hashFiles('.github/workflows/cache.yml') }}-${{ runner.os }}-${{ env.OS_ARCH }}-${{ hashFiles('sources/**/go.sum') }}
     - run: cargo install cargo-make
       shell: bash
     - if: ${{ inputs.perform-cache-cleanup }}
diff --git a/.github/workflows/cache.yml b/.github/workflows/cache.yml
index 174a27241..5d975c9b6 100644
--- a/.github/workflows/cache.yml
+++ b/.github/workflows/cache.yml
@@ -1,4 +1,4 @@
-# This workflow caches crate dependencies and build artifacts for tools (except 'test-tools' since we don't use them in build workflows).
+# This workflow caches crate dependencies, build tools, and external kits.
 # The cache is only usable by workflows started from pull requests against the develop branch.
 name: CacheDepsAndTools
 on:
@@ -7,6 +7,7 @@ on:
     paths:
       - '.github/**'
       - 'sources/Cargo.lock'
+      - 'sources/**/go.sum'
       - 'Twoliter.toml'
       - 'Twoliter.lock'
       - 'Makefile'
@@ -23,6 +24,13 @@ jobs:
         uses: ./.github/actions/setup-node
         with:
           perform-cache-cleanup: true
-      - run: cargo make install-twoliter
+      # This installs twoliter.
+      - run: make prep
+      # This fetches any external kit dependencies.
+      - run: make fetch
+      # This cleans the existing project local caches.
+      - run: make twoliter purge-cache
+      # This fetches Rust crate and Go module dependencies.
+      - run: make twoliter fetch
       # This cleans the cargo cache in ~/.cargo
       - run: cargo-cache