diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 3425c031..28ea6655 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -585,7 +585,7 @@ jobs:
         with:
           php-version: ${{ matrix.php }}
           # https://github.com/shivammathur/icu-intl#icu4c-builds
-          extensions: json, mbstring, intl-74.1
+          extensions: json, mbstring, intl-78.1
         env:
           phpts: ${{ matrix.ts }}
       - uses: actions/download-artifact@v4
diff --git a/.github/workflows/versions.yml b/.github/workflows/versions.yml
index 87d8dad4..a2b2d88d 100644
--- a/.github/workflows/versions.yml
+++ b/.github/workflows/versions.yml
@@ -188,7 +188,7 @@ jobs:
         with:
           php-version: '8.3'
           # https://github.com/shivammathur/icu-intl#icu4c-builds
-          extensions: json, mbstring, intl-74.1
+          extensions: json, mbstring, intl-78.1
         env:
           phpts: nts
       - uses: actions/download-artifact@v4