diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index af64d758..d8c99fc6 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -24,7 +24,7 @@ jobs:
         with:
           # lib/starling-regexp is a submodule; the build fails without it.
           submodules: recursive
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/setup-dotnet@v5
         with:
           # global.json pins the exact SDK (currently the .NET 11 preview).
           # Install from it so CI always matches the repo's pinned SDK.
@@ -85,7 +85,7 @@ jobs:
           # lib/starling-regexp is a submodule; dotnet format compiles, so the
           # build graph still needs the submodule sources present.
           submodules: recursive
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/setup-dotnet@v5
         with:
           # Match the SDK pinned in global.json (the .NET 11 preview).
           global-json-file: global.json
@@ -140,7 +140,7 @@ jobs:
         with:
           # lib/starling-regexp is a submodule; the build fails without it.
           submodules: recursive
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/setup-dotnet@v5
         with:
           # Match the SDK pinned in global.json (the .NET 11 preview).
           global-json-file: global.json
diff --git a/.github/workflows/fork-ci.yml b/.github/workflows/fork-ci.yml
index 237c5812..844f7072 100644
--- a/.github/workflows/fork-ci.yml
+++ b/.github/workflows/fork-ci.yml
@@ -56,7 +56,7 @@ jobs:
           # gate above must include eyeballing .gitmodules changes, same as
           # any other PR file that influences the build.
           submodules: recursive
-      - uses: actions/setup-dotnet@v4
+      - uses: actions/setup-dotnet@v5
         with:
           # Match the SDK pinned in global.json (the .NET 11 preview).
           global-json-file: global.json