diff --git a/.github/workflows/bsd.yaml b/.github/workflows/bsd.yaml
index 797b8f2b416..4db8dda90f3 100644
--- a/.github/workflows/bsd.yaml
+++ b/.github/workflows/bsd.yaml
@@ -14,8 +14,9 @@ jobs:
         with:
           submodules: recursive
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: freebsd-13.2-gmake-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -75,8 +76,9 @@ jobs:
         with:
           submodules: recursive
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: openbsd-7.4-gmake-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -136,8 +138,9 @@ jobs:
         with:
           submodules: recursive
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: netbsd-9.3-gmake-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
diff --git a/.github/workflows/build-and-test-Linux.yaml b/.github/workflows/build-and-test-Linux.yaml
index 2ab7e0a4dfd..30779b0e835 100644
--- a/.github/workflows/build-and-test-Linux.yaml
+++ b/.github/workflows/build-and-test-Linux.yaml
@@ -25,8 +25,9 @@ jobs:
           sudo apt-get install --no-install-recommends -y gawk jq
 
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-clang-${{ github.ref }}-${{ github.sha }}-KERNEL
           restore-keys: |
diff --git a/.github/workflows/build-and-test-Xen.yaml b/.github/workflows/build-and-test-Xen.yaml
index 66779668fcc..8102fc66ca4 100644
--- a/.github/workflows/build-and-test-Xen.yaml
+++ b/.github/workflows/build-and-test-Xen.yaml
@@ -24,8 +24,9 @@ jobs:
           sudo apt-get install --no-install-recommends -y libgtk2.0-dev libyajl-dev time ccache clang-10 clang++-10
 
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-clang-${{ github.ref }}-${{ github.sha }}-XEN
           restore-keys: |
diff --git a/.github/workflows/csmith.yaml b/.github/workflows/csmith.yaml
index a5e144ac055..40e8b9f7b91 100644
--- a/.github/workflows/csmith.yaml
+++ b/.github/workflows/csmith.yaml
@@ -23,8 +23,9 @@ jobs:
           sudo apt-get install --no-install-recommends -y csmith libcsmith-dev
           make -C src minisat2-download
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-clang-${{ github.ref }}-${{ github.sha }}-CSMITH
           restore-keys: |
diff --git a/.github/workflows/pull-request-check-rust-api.yaml b/.github/workflows/pull-request-check-rust-api.yaml
index 8a48bcfa98f..bb486a13933 100644
--- a/.github/workflows/pull-request-check-rust-api.yaml
+++ b/.github/workflows/pull-request-check-rust-api.yaml
@@ -33,8 +33,9 @@ jobs:
       - name: Log cargo/rust version
         run: cargo --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-cmake-clang-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -79,8 +80,9 @@ jobs:
       - name: Log cargo/rust version
         run: cargo --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-Release-Minisat-${{ github.ref }}-${{ github.sha }}-PR-Rust-API
           restore-keys: |
diff --git a/.github/workflows/pull-request-checks.yaml b/.github/workflows/pull-request-checks.yaml
index f9eacdf8071..a09bf84b422 100644
--- a/.github/workflows/pull-request-checks.yaml
+++ b/.github/workflows/pull-request-checks.yaml
@@ -32,8 +32,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -117,8 +118,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-clang-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -181,8 +183,9 @@ jobs:
       - name: Confirm z3 solver is available and log the version installed
         run: z3 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-make-clang-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -225,8 +228,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-Release-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -296,8 +300,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-make-clang-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -361,8 +366,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-Release-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -420,8 +426,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-Release-gcc-13-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -466,8 +473,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-Release-32-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -504,8 +512,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install --no-install-recommends -yq cmake ninja-build gcc g++ maven flex bison libxml2-utils ccache z3
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-Release-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -550,8 +559,9 @@ jobs:
           sudo apt-get update
           sudo apt-get install --no-install-recommends -yq cmake ninja-build gcc g++ maven flex bison libxml2-utils ccache z3
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-Release-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -590,8 +600,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-make-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -641,8 +652,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-Release-Glucose-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -698,8 +710,9 @@ jobs:
       - name: Confirm cvc5 solver is available and log the version installed
         run: cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-msbuild-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -756,8 +769,9 @@ jobs:
       - name: Initialise Developer Command Line
         uses: ilammy/msvc-dev-cmd@v1
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-msbuild-make-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
@@ -811,8 +825,9 @@ jobs:
           nuget install clcache -OutputDirectory "c:\tools" -ExcludeVersion -Version 4.1.0
           echo "c:\tools\clcache\clcache-4.1.0" >> $env:GITHUB_PATH
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-msbuild-${{ github.ref }}-${{ github.sha }}-PKG
           restore-keys: |
@@ -928,8 +943,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-Coverage-${{ github.ref }}-${{ github.sha }}-PR
           restore-keys: |
diff --git a/.github/workflows/release-packages.yaml b/.github/workflows/release-packages.yaml
index a8e08f94804..dcf307df97f 100644
--- a/.github/workflows/release-packages.yaml
+++ b/.github/workflows/release-packages.yaml
@@ -27,8 +27,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-22.04-Release-${{ github.ref }}-${{ github.sha }}-RELEASEPKG
           restore-keys:
@@ -97,8 +98,9 @@ jobs:
           mv cvc5 /usr/local/bin
           cvc5 --version
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-20.04-Release-${{ github.ref }}-${{ github.sha }}-RELEASEPKG
           restore-keys: |
@@ -199,8 +201,9 @@ jobs:
           echo "$(Split-Path -Path $(Get-ChildItem -Path "${env:ProgramFiles(x86)}\Windows Kits\10\App Certification Kit\signtool.exe"))" >> $env:GITHUB_PATH
           echo "pfxcert=$([string](Get-Location)+'\CodeSignCertificate.pfx')" >> $env:GITHUB_ENV
       - name: Prepare ccache
-        uses: actions/cache@v3
+        uses: actions/cache@v4
         with:
+          save-always: true
           path: .ccache
           key: ${{ runner.os }}-msbuild-${{ github.ref }}-${{ github.sha }}-RELEASEPKG
           restore-keys: |