diff --git a/.github/workflows/backport.yaml b/.github/workflows/backport.yaml
index 43c61bdf9..91adc23ae 100644
--- a/.github/workflows/backport.yaml
+++ b/.github/workflows/backport.yaml
@@ -7,6 +7,10 @@ on:
       - labeled
       - closed
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   backport:
     name: Backport PR
diff --git a/.github/workflows/release-please.yaml b/.github/workflows/release-please.yaml
index 844fce59f..62ada748c 100644
--- a/.github/workflows/release-please.yaml
+++ b/.github/workflows/release-please.yaml
@@ -13,6 +13,10 @@ permissions:
   pull-requests: write
   actions: write
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   release-please:
     runs-on: ubuntu-22.04