diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index f894ef0b9..0f3355bfb 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -63,7 +63,7 @@ jobs:
 
     - name: Cache stack global package db
       id:   stack-global
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.stack
         key: ${{ runner.os }}-stack-global-${{ matrix.plan.key }}-${{ hashFiles('**.yaml') }}
@@ -73,7 +73,7 @@ jobs:
 
     - name: Cache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.local/bin
         key: ${{ runner.os }}-stack-programs-${{ matrix.plan.key }}-${{ hashFiles('**.yaml') }}
@@ -83,7 +83,7 @@ jobs:
 
     # stack's local package dbs for the project and each package
     - name: Cache .stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work-${{ matrix.plan.key }}-${{ hashFiles('**.yaml') }}
@@ -92,7 +92,7 @@ jobs:
           ${{ runner.os }}-stack-work
 
     - name: Cache hledger-lib/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work-${{ matrix.plan.key }}-${{ hashFiles('hledger-lib/package.yaml') }}
@@ -101,7 +101,7 @@ jobs:
           ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Cache hledger/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work-${{ matrix.plan.key }}-${{ hashFiles('hledger/package.yaml') }}
@@ -110,7 +110,7 @@ jobs:
           ${{ runner.os }}-hledger-stack-work
 
     - name: Cache hledger-ui/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work-${{ matrix.plan.key }}-${{ hashFiles('hledger-ui/package.yaml') }}
@@ -119,7 +119,7 @@ jobs:
           ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Cache hledger-web/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work-${{ matrix.plan.key }}-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index 9765c8c10..ad8e0cd82 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -35,7 +35,7 @@ jobs:
 
     - name: Cache stack global package db
       id:   stack-global
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.stack
         key:          ${{ runner.os }}-stack-global-${{ hashFiles('**.yaml') }}
@@ -45,7 +45,7 @@ jobs:
 
     - name: Cache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.local/bin
         key:          ${{ runner.os }}-stack-programs-${{ hashFiles('**.yaml') }}
@@ -55,31 +55,31 @@ jobs:
 
     # stack's local package dbs for the project and each package
     - name: Cache .stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: .stack-work
         key: ${{ runner.os }}-stack-work
 
     - name: Cache hledger-lib/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-lib/.stack-work
         key: ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Cache hledger/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger/.stack-work
         key: ${{ runner.os }}-hledger-stack-work
 
     - name: Cache hledger-ui/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-ui/.stack-work
         key: ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Cache hledger-web/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-web/.stack-work
         key: ${{ runner.os }}-hledger-web-stack-work
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index 1cbcd3683..ccbb52930 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -48,7 +48,7 @@ jobs:
 
     - name: Cache stack global package db
       id:   stack-global
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.stack
         key:          ${{ runner.os }}-stack-global-${{ hashFiles('**.yaml') }}
@@ -58,7 +58,7 @@ jobs:
 
     - name: Cache stack-installed programs in ~/.local/bin
       id:   stack-programs
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: ~/.local/bin
         key:          ${{ runner.os }}-stack-programs-${{ hashFiles('**.yaml') }}
@@ -68,35 +68,35 @@ jobs:
 
     # stack's local package dbs for the project and each package
     - name: Cache .stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: .stack-work
         key:          ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
         restore-keys: ${{ runner.os }}-stack-work
 
     - name: Cache hledger-lib/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-lib/.stack-work
         key:          ${{ runner.os }}-hledger-lib-stack-work-${{ hashFiles('hledger-lib/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Cache hledger/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger/.stack-work
         key:          ${{ runner.os }}-hledger-stack-work-${{ hashFiles('hledger/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-stack-work
 
     - name: Cache hledger-ui/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-ui/.stack-work
         key:          ${{ runner.os }}-hledger-ui-stack-work-${{ hashFiles('hledger-ui/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Cache hledger-web/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-web/.stack-work
         key:          ${{ runner.os }}-hledger-web-stack-work-${{ hashFiles('hledger-web/package.yaml') }}
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 01d0d2cdb..69c710c3b 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -36,7 +36,7 @@ jobs:
 
     - name: Cache stack global package db
       id:   stack-global-package-db
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: C:\Users\runneradmin\AppData\Roaming\stack\
         key:          ${{ runner.os }}-appdata-roaming-stack-${{ hashFiles('**.yaml') }}
@@ -49,7 +49,7 @@ jobs:
 
     - name: Cache stack programs dir   # ghc, ghc-included packages and their haddocks, mingw, msys2
       id:   stack-programs-dir
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: C:\Users\runneradmin\AppData\Local\Programs\stack\
         # which files signal a change in stack's global db ?
@@ -64,35 +64,35 @@ jobs:
 
     # stack's local package dbs for the project and each package
     - name: Cache .stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: .stack-work
         key:          ${{ runner.os }}-stack-work-${{ hashFiles('**.yaml') }}
         restore-keys: ${{ runner.os }}-stack-work
 
     - name: Cache hledger-lib/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-lib/.stack-work
         key:          ${{ runner.os }}-hledger-lib-stack-work-${{ hashFiles('hledger-lib/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-lib-stack-work
 
     - name: Cache hledger/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger/.stack-work
         key:          ${{ runner.os }}-hledger-stack-work-${{ hashFiles('hledger/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-stack-work
 
     - name: Cache hledger-ui/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-ui/.stack-work
         key:          ${{ runner.os }}-hledger-ui-stack-work-${{ hashFiles('hledger-ui/package.yaml') }}
         restore-keys: ${{ runner.os }}-hledger-ui-stack-work
 
     - name: Cache hledger-web/.stack-work
-      uses: actions/cache@v1
+      uses: actions/cache@v2
       with:
         path: hledger-web/.stack-work
         key:          ${{ runner.os }}-hledger-web-stack-work-${{ hashFiles('hledger-web/package.yaml') }}