diff --git a/.ci/install.sh b/.ci/install.sh
index 3913a21513c..e4739eb2f56 100755
--- a/.ci/install.sh
+++ b/.ci/install.sh
@@ -62,7 +62,9 @@ if [[ $(uname) != CYGWIN* ]]; then
     pushd depends && time ./install_webp.sh && popd
 
     # libimagequant
-    pushd depends && time ./install_imagequant.sh && popd
+    if [[ "$GHA_LIBIMAGEQUANT_CACHE_HIT" != "true" ]]; then
+        pushd depends && time ./install_imagequant.sh && popd
+    fi
 
     # raqm
     pushd depends && time ./install_raqm.sh && popd
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 1519feba055..9d9ee90005c 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -93,12 +93,25 @@ jobs:
           sway
           wl-clipboard
 
+    - name: Cache libimagequant
+      if: startsWith(matrix.os, 'ubuntu')
+      uses: actions/cache@v4
+      id: cache-libimagequant
+      with:
+        path: |
+          /usr/include/libimagequant.h
+          /usr/lib/libimagequant.so*
+        key: ${{ runner.os }}-libimagequant-${{ hashFiles('/usr/include/libimagequant.h') }}-${{ hashFiles('/usr/lib/libimagequant.so*') }}
+        restore-keys: |
+          ${{ runner.os }}-libimagequant-
+
     - 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 b7cebbdbf60..2d2460b61f8 100755
--- a/depends/install_imagequant.sh
+++ b/depends/install_imagequant.sh
@@ -7,8 +7,8 @@ archive=libimagequant-4.2.2
 
 pushd $archive/imagequant-sys
 
-cargo install cargo-c
-cargo cinstall --prefix=/usr --destdir=.
+time cargo install cargo-c
+time cargo cinstall --prefix=/usr --destdir=.
 sudo cp usr/lib/libimagequant.so* /usr/lib/
 sudo cp usr/include/libimagequant.h /usr/include/