diff --git a/.github/workflows/binaries-linux-x64.yml b/.github/workflows/binaries-linux-x64.yml
index e108a5a20..5038b400d 100644
--- a/.github/workflows/binaries-linux-x64.yml
+++ b/.github/workflows/binaries-linux-x64.yml
@@ -37,7 +37,7 @@ jobs:
 
     - name: Uncache ghcup-installed tools
       id:   ghcup
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.ghcup
         key: ${{ runner.os }}-ghcup-${{ hashFiles('**.yaml') }}
@@ -46,7 +46,7 @@ jobs:
 
     # - name: Uncache cabal-installed libs
     #   id:   cabal
-    #   uses: actions/cache@v3
+    #   uses: actions/cache@v4
     #   with:
     #     path: ~/.cabal
     #     key: ${{ runner.os }}-cabal-${{ hashFiles('**.yaml') }}
@@ -55,7 +55,7 @@ jobs:
 
     - name: Uncache stack global package db
       id:   stack-global
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.stack
         key: ${{ runner.os }}-stack-global-20240417-${{ hashFiles('**.yaml') }}
@@ -64,7 +64,7 @@ jobs:
 
     - name: Uncache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.local/bin
         key: ${{ runner.os }}-stack-programs-20240417-${{ hashFiles('**.yaml') }}
@@ -72,7 +72,7 @@ jobs:
              ${{ runner.os }}-stack-programs-20240417
 
     - name: Uncache .stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-20240417-${{ hashFiles('**.yaml') }}
@@ -80,7 +80,7 @@ jobs:
              ${{ runner.os }}-stack-work-20240417
 
     - name: Uncache hledger-lib/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-20240417-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -88,7 +88,7 @@ jobs:
              ${{ runner.os }}-hledger-lib-stack-work-20240417
 
     - name: Uncache hledger/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-20240417-${{ hashFiles('hledger/package.yaml') }}
@@ -96,7 +96,7 @@ jobs:
              ${{ runner.os }}-hledger-stack-work-20240417
 
     - name: Uncache hledger-ui/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-20240417-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -104,7 +104,7 @@ jobs:
              ${{ runner.os }}-hledger-ui-stack-work-20240417
 
     - name: Uncache hledger-web/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-20240417-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/binaries-mac-arm64.yml b/.github/workflows/binaries-mac-arm64.yml
index adc1832ec..556af5cfe 100644
--- a/.github/workflows/binaries-mac-arm64.yml
+++ b/.github/workflows/binaries-mac-arm64.yml
@@ -56,7 +56,7 @@ jobs:
 
     - name: Uncache stack global package db
       id:   stack-global
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.stack
         key: ${{ runner.os }}-stack-global-from20220817-${{ hashFiles('**.yaml') }}
@@ -65,7 +65,7 @@ jobs:
 
     - name: Uncache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.local/bin
         key: ${{ runner.os }}-stack-programs-from20220817-${{ hashFiles('**.yaml') }}
@@ -73,7 +73,7 @@ jobs:
              ${{ runner.os }}-stack-programs-from20220817
 
     - name: Uncache .stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-from20220817-${{ hashFiles('**.yaml') }}
@@ -81,7 +81,7 @@ jobs:
              ${{ runner.os }}-stack-work-from20220817
 
     - name: Uncache hledger-lib/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-from20220817-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -89,7 +89,7 @@ jobs:
              ${{ runner.os }}-hledger-lib-stack-work-from20220817
 
     - name: Uncache hledger/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-from20220817-${{ hashFiles('hledger/package.yaml') }}
@@ -97,7 +97,7 @@ jobs:
              ${{ runner.os }}-hledger-stack-work-from20220817
 
     - name: Uncache hledger-ui/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-from20220817-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -105,7 +105,7 @@ jobs:
              ${{ runner.os }}-hledger-ui-stack-work-from20220817
 
     - name: Uncache hledger-web/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-from20220817-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/binaries-mac-x64.yml b/.github/workflows/binaries-mac-x64.yml
index b924ac2e5..aa95e4dfc 100644
--- a/.github/workflows/binaries-mac-x64.yml
+++ b/.github/workflows/binaries-mac-x64.yml
@@ -56,7 +56,7 @@ jobs:
 
     - name: Uncache stack global package db
       id:   stack-global
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.stack
         key: ${{ runner.os }}-stack-global-from20220817-${{ hashFiles('**.yaml') }}
@@ -65,7 +65,7 @@ jobs:
 
     - name: Uncache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.local/bin
         key: ${{ runner.os }}-stack-programs-from20220817-${{ hashFiles('**.yaml') }}
@@ -73,7 +73,7 @@ jobs:
              ${{ runner.os }}-stack-programs-from20220817
 
     - name: Uncache .stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-from20220817-${{ hashFiles('**.yaml') }}
@@ -81,7 +81,7 @@ jobs:
              ${{ runner.os }}-stack-work-from20220817
 
     - name: Uncache hledger-lib/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-from20220817-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -89,7 +89,7 @@ jobs:
              ${{ runner.os }}-hledger-lib-stack-work-from20220817
 
     - name: Uncache hledger/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-from20220817-${{ hashFiles('hledger/package.yaml') }}
@@ -97,7 +97,7 @@ jobs:
              ${{ runner.os }}-hledger-stack-work-from20220817
 
     - name: Uncache hledger-ui/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-from20220817-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -105,7 +105,7 @@ jobs:
              ${{ runner.os }}-hledger-ui-stack-work-from20220817
 
     - name: Uncache hledger-web/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-from20220817-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/binaries-windows-x64.yml b/.github/workflows/binaries-windows-x64.yml
index cb35b7f86..f14d08380 100644
--- a/.github/workflows/binaries-windows-x64.yml
+++ b/.github/workflows/binaries-windows-x64.yml
@@ -33,7 +33,7 @@ jobs:
 
     - name: Uncache stack global package db
       id:   stack-global-package-db
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: C:\Users\runneradmin\AppData\Roaming\stack\
         key: ${{ runner.os }}-appdata-roaming-stack-${{ hashFiles('**.yaml') }}
@@ -42,7 +42,7 @@ jobs:
 
     - name: Uncache stack programs dir   # ghc, ghc-included packages and their haddocks, mingw, msys2
       id:   stack-programs-dir
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: C:\Users\runneradmin\AppData\Local\Programs\stack\
         # which files signal a change in stack's global db ?
@@ -52,7 +52,7 @@ jobs:
              ${{ runner.os }}-appdata-local-programs-stack
 
     - name: Uncache .stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
@@ -60,7 +60,7 @@ jobs:
              ${{ runner.os }}-stack-work
 
     - name: Uncache hledger-lib/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -68,7 +68,7 @@ jobs:
              ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Uncache hledger/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-${{ hashFiles('hledger/package.yaml') }}
@@ -76,7 +76,7 @@ jobs:
              ${{ runner.os }}-hledger-stack-work
 
     - name: Uncache hledger-ui/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -84,7 +84,7 @@ jobs:
              ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Uncache hledger-web/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2377d9b4e..a23bdd806 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -151,7 +151,7 @@ jobs:
 
     - name: Uncache stack global package db
       id:   stack-global
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.stack
         # XXX if stack.yaml is a symlink, this fails with
@@ -164,7 +164,7 @@ jobs:
 
     - name: Uncache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.local/bin
         key: ${{ runner.os }}-stack-programs-$ghc-${{ hashFiles('**.yaml') }}
@@ -173,7 +173,7 @@ jobs:
       if: env.CONTINUE
 
     - name: Uncache .stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-$ghc-${{ hashFiles('**.yaml') }}
@@ -182,7 +182,7 @@ jobs:
       if: env.CONTINUE
 
     - name: Uncache hledger-lib/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-$ghc-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -191,7 +191,7 @@ jobs:
       if: env.CONTINUE
 
     - name: Uncache hledger/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-$ghc-${{ hashFiles('hledger/package.yaml') }}
@@ -200,7 +200,7 @@ jobs:
       if: env.CONTINUE
 
     - name: Uncache hledger-ui/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-$ghc-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -209,7 +209,7 @@ jobs:
       if: env.CONTINUE
 
     - name: Uncache hledger-web/.stack-work
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-$ghc-${{ hashFiles('hledger-web/package.yaml') }}