diff --git a/.github/workflows/reusable-base.yml b/.github/workflows/reusable-base.yml
index c174765..2d516be 100644
--- a/.github/workflows/reusable-base.yml
+++ b/.github/workflows/reusable-base.yml
@@ -77,23 +77,28 @@ jobs:
       if: runner.os != 'Windows'
       run: echo "dir=$(npm config get cache)" >> $GITHUB_OUTPUT
 
+    # New prefix generated every 120 days, to ensure npm cache doesn't grow too large
+    - name: Get npm cache timed expiration
+      id: npm-timed-expiration
+      run: echo "prefix=$(( $(date +%s) / 60 / 60 / 24 / 120 ))" >> $GITHUB_OUTPUT
+
     - name: Restore cache using package-lock.json hash
       uses: actions/cache@v3
       if: ${{ !inputs.no-lockfile }}
       with:
         path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-        key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+        key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package-lock.json') }}
         restore-keys: |
-          ${{ runner.os }}-node-
+          ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
     - name: Restore cache using package.json hash
       uses: actions/cache@v3
       if: ${{ inputs.no-lockfile }}
       with:
         path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-        key: ${{ runner.os }}-node-${{ hashFiles('package.json') }}
+        key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package.json') }}
         restore-keys: |
-          ${{ runner.os }}-node-
+          ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
     - run: npm ci --no-audit --no-fund
       if: ${{ !inputs.no-lockfile }}
diff --git a/.github/workflows/reusable-sync.yml b/.github/workflows/reusable-sync.yml
index a5453d0..64792b9 100644
--- a/.github/workflows/reusable-sync.yml
+++ b/.github/workflows/reusable-sync.yml
@@ -120,23 +120,28 @@ jobs:
         if: (inputs.npm-pre-sync-script || inputs.npm-post-sync-script) && runner.os != 'Windows'
         run: echo "dir=$(npm config get cache)" >> $GITHUB_OUTPUT
 
+      # New prefix generated every 120 days, to ensure npm cache doesn't grow too large
+      - name: Get npm cache timed expiration
+        id: npm-timed-expiration
+        run: echo "prefix=$(( $(date +%s) / 60 / 60 / 24 / 120 ))" >> $GITHUB_OUTPUT
+
       - name: Restore cache using package-lock.json hash
         uses: actions/cache@v3
         if: (inputs.npm-pre-sync-script || inputs.npm-post-sync-script) && !inputs.no-lockfile
         with:
           path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+          key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
       - name: Restore cache using package.json hash
         uses: actions/cache@v3
         if: (inputs.npm-pre-sync-script || inputs.npm-post-sync-script) && inputs.no-lockfile
         with:
           path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('package.json') }}
+          key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package.json') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
       - run: npm ci --no-audit --no-fund
         if: (inputs.npm-pre-sync-script || inputs.npm-post-sync-script) && !inputs.no-lockfile
diff --git a/.github/workflows/type-check.yml b/.github/workflows/type-check.yml
index c6ae162..bdcddbe 100644
--- a/.github/workflows/type-check.yml
+++ b/.github/workflows/type-check.yml
@@ -83,23 +83,28 @@ jobs:
         if: runner.os != 'Windows'
         run: echo "dir=$(npm config get cache)" >> $GITHUB_OUTPUT
 
+      # New prefix generated every 120 days, to ensure npm cache doesn't grow too large
+      - name: Get npm cache timed expiration
+        id: npm-timed-expiration
+        run: echo "prefix=$(( $(date +%s) / 60 / 60 / 24 / 120 ))" >> $GITHUB_OUTPUT
+
       - name: Restore cache using package-lock.json hash
         uses: actions/cache@v3
         if: ${{ !inputs.no-lockfile }}
         with:
           path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('package-lock.json') }}
+          key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package-lock.json') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
       - name: Restore cache using package.json hash
         uses: actions/cache@v3
         if: ${{ inputs.no-lockfile }}
         with:
           path: ${{ steps.npm-cache-dir-windows.outputs.dir || steps.npm-cache-dir.outputs.dir }}
-          key: ${{ runner.os }}-node-${{ hashFiles('package.json') }}
+          key: ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-${{ hashFiles('package.json') }}
           restore-keys: |
-            ${{ runner.os }}-node-
+            ${{ runner.os }}-node-${{ steps.npm-timed-expiration.outputs.prefix }}-
 
       - run: npm ci --no-audit --no-fund
         if: ${{ !inputs.no-lockfile }}