diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 685346225..4319cc8ff 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -44,11 +44,19 @@ jobs:
     - name: Build system information
       run: python3 .github/workflows/system-info.py
 
+    - name: Cache libimagequant
+      uses: actions/cache@v4
+      id: cache-libimagequant
+      with:
+        path: ~/cache-libimagequant
+        key: ${{ runner.os }}-libimagequant-${{ hashFiles('depends/install_imagequant.sh') }}
+
     - name: Install Linux dependencies
       run: |
         .ci/install.sh
       env:
         GHA_PYTHON_VERSION: "3.x"
+        GHA_LIBIMAGEQUANT_CACHE_HIT: ${{ steps.cache-libimagequant.outputs.cache-hit }}
 
     - name: Build
       run: |
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2044620aa..4e23f5c5b 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -75,12 +75,21 @@ jobs:
     - name: Build system information
       run: python3 .github/workflows/system-info.py
 
+    - name: Cache libimagequant
+      if: startsWith(matrix.os, 'ubuntu')
+      uses: actions/cache@v4
+      id: cache-libimagequant
+      with:
+        path: ~/cache-libimagequant
+        key: ${{ runner.os }}-libimagequant-${{ hashFiles('depends/install_imagequant.sh') }}
+
     - name: Install Linux dependencies
       if: startsWith(matrix.os, 'ubuntu')
       run: |
         .ci/install.sh
       env:
         GHA_PYTHON_VERSION: ${{ matrix.python-version }}
+        GHA_LIBIMAGEQUANT_CACHE_HIT: ${{ steps.cache-libimagequant.outputs.cache-hit }}
 
     - name: Install macOS dependencies
       if: startsWith(matrix.os, 'macOS')
diff --git a/depends/install_imagequant.sh b/depends/install_imagequant.sh
index b7cebbdbf..0fe8cbdba 100755
--- a/depends/install_imagequant.sh
+++ b/depends/install_imagequant.sh
@@ -1,15 +1,37 @@
 #!/bin/bash
 # install libimagequant
 
-archive=libimagequant-4.2.2
+archive_name=libimagequant
+archive_version=4.2.2
 
-./download-and-extract.sh $archive https://raw.githubusercontent.com/python-pillow/pillow-depends/main/$archive.tar.gz
+archive=$archive_name-$archive_version
 
-pushd $archive/imagequant-sys
+if [[ "$GHA_LIBIMAGEQUANT_CACHE_HIT" == "true" ]]; then
 
-cargo install cargo-c
-cargo cinstall --prefix=/usr --destdir=.
-sudo cp usr/lib/libimagequant.so* /usr/lib/
-sudo cp usr/include/libimagequant.h /usr/include/
+    # Copy cached files into place
+    sudo cp ~/cache-$archive_name/libimagequant.so* /usr/lib/
+    sudo cp ~/cache-$archive_name/libimagequant.h /usr/include/
 
-popd
+else
+
+    # Build from source
+    ./download-and-extract.sh $archive https://raw.githubusercontent.com/python-pillow/pillow-depends/main/$archive.tar.gz
+
+    pushd $archive/imagequant-sys
+
+    time cargo install cargo-c
+    time cargo cinstall --prefix=/usr --destdir=.
+
+    # Copy into place
+    sudo cp usr/lib/libimagequant.so* /usr/lib/
+    sudo cp usr/include/libimagequant.h /usr/include/
+
+    # Copy to cache
+    rm -rf ~/cache-$archive_name
+    mkdir ~/cache-$archive_name
+    cp usr/lib/libimagequant.so* ~/cache-$archive_name/
+    cp usr/include/libimagequant.h ~/cache-$archive_name/
+
+    popd
+
+fi