diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index df9746c61..d0c7d0041 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -63,9 +63,8 @@ jobs:
       with:
         key: ${{ matrix.os || 'ubuntu-20.04' }}-${{ matrix.SWIGLANG }}
     - name: configure
-      shell: bash
       run: |
-          set -ex
+          set -x
           export PATH="/usr/lib/ccache:/usr/local/opt/ccache/libexec:$PATH"
           source Tools/GHA-linux-install.sh
           if test -n "$CPP11"; then CONFIGOPTS+=(--enable-cpp11-testing "CXXFLAGS=-std=c++11 $CXXFLAGS" "CFLAGS=-std=c11 $CFLAGS") && export CSTD=c11 && export CPPSTD=c++11; fi
@@ -92,9 +91,8 @@ jobs:
           echo SWIGJOBS=-j$cpu_count >> $GITHUB_ENV
 
     - name: build
-      shell: bash
       run: |
-          set -ex
+          set -x
           cd ${GITHUB_WORKSPACE}/build/build;
           make -s $SWIGJOBS
           ./swig -version && ./swig -pcreversion
@@ -103,9 +101,8 @@ jobs:
           echo 'Installing...'
           if test -z "$SWIGLANG"; then sudo make -s install && swig -version && ccache-swig -V; fi
     - name: tests
-      shell: bash
       run: |
-          set -ex
+          set -x
           cd ${GITHUB_WORKSPACE}/build/build;
           if test -n "$CPP11"; then export CPPSTD=c++11; fi
           if test -n "$CPP14"; then export CPPSTD=c++14; fi