diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 45ef418f4..fb7b61955 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -110,6 +110,7 @@ jobs:
       env:
         BEFORE: ${{ github.event.before }}
         NUM:    20
+      shell: bash
       run: |
         RANGE=${BEFORE:-origin/master}..${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF}
         git rev-list --quiet $RANGE \
@@ -117,6 +118,7 @@ jobs:
           || ( echo "could not identify commit range, checking last $NUM instead:"; bin/commitlint -$NUM )
 
     - name: Skip remaining CI steps if latest commit message begins with ;
+      shell: bash
       run: |
         echo "git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog"
         (git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog \
diff --git a/.github/workflows/mac.yml b/.github/workflows/mac.yml
index f5f6bed8e..62f887311 100644
--- a/.github/workflows/mac.yml
+++ b/.github/workflows/mac.yml
@@ -67,6 +67,7 @@ jobs:
       env:
         BEFORE: ${{ github.event.before }}
         NUM:    20
+      shell: bash
       run: |
         RANGE=${BEFORE:-origin/master}..${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF}
         git rev-list --quiet $RANGE \
@@ -74,6 +75,7 @@ jobs:
           || ( echo "could not identify commits, checking last $NUM instead:"; bin/commitlint -$NUM )
 
     - name: Skip remaining CI steps if latest commit message begins with ;
+      shell: bash
       run: |
         echo "git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog"
         (git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog \
diff --git a/.github/workflows/push.yml b/.github/workflows/push.yml
index 741203bee..7a9df8661 100644
--- a/.github/workflows/push.yml
+++ b/.github/workflows/push.yml
@@ -78,6 +78,7 @@ jobs:
       env:
         BEFORE: ${{ github.event.before }}
         NUM:    20
+      shell: bash
       run: |
         RANGE=${BEFORE:-origin/master}..${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF}
         git rev-list --quiet $RANGE \
@@ -85,6 +86,7 @@ jobs:
           || ( echo "could not identify commits, checking last $NUM instead:"; bin/commitlint -$NUM )
 
     - name: Skip remaining CI steps if latest commit message begins with ;
+      shell: bash
       run: |
         echo "git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog"
         (git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog \
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 0813e3f50..1ca3c3265 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -68,6 +68,7 @@ jobs:
           || ( echo "could not identify commits, checking last $NUM instead:"; bin/commitlint -$NUM )
 
     - name: Skip remaining CI steps if latest commit message begins with ;
+      shell: bash
       run: |
         echo "git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog"
         (git log -1 --pretty='%s' ${GITHUB_HEAD_REF:+origin/$GITHUB_HEAD_REF} >> $$.gitlog \