diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index a4efc75bde..e6813eacf4 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -38,8 +38,8 @@ jobs:
         fi
         echo "BOOST_SELF=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_ENV
         echo "BOOST_ROOT=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_ENV
-        echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_OUTPUT
-        echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_OUTPUT
+        echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> "$GITHUB_OUTPUT"
+        echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> "$GITHUB_OUTPUT"
 
     - name: Clone boostorg/boost
       run: |
diff --git a/.github/workflows/headers.yml b/.github/workflows/headers.yml
index e9f3d2d6ac..3b0bbed3ec 100644
--- a/.github/workflows/headers.yml
+++ b/.github/workflows/headers.yml
@@ -28,8 +28,8 @@ jobs:
         fi
         echo "BOOST_SELF=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_ENV
         echo "BOOST_ROOT=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_ENV
-        echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_OUTPUT
-        echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_OUTPUT
+        echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> "$GITHUB_OUTPUT"
+        echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> "$GITHUB_OUTPUT"
 
     - name: Clone boostorg/boost
       run: |
diff --git a/.github/workflows/minimal.yml b/.github/workflows/minimal.yml
index bdc49b429c..8e5aba837e 100644
--- a/.github/workflows/minimal.yml
+++ b/.github/workflows/minimal.yml
@@ -102,8 +102,8 @@ jobs:
           fi
           echo "BOOST_SELF=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_ENV
           echo "BOOST_ROOT=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_ENV
-          echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_OUTPUT
-          echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_OUTPUT
+          echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> "$GITHUB_OUTPUT"
+          echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> "$GITHUB_OUTPUT"
 
       - name: Clone boostorg/boost
         run: |
@@ -221,8 +221,8 @@ jobs:
           fi
           echo "BOOST_SELF=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_ENV
           echo "BOOST_ROOT=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_ENV
-          echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> $GITHUB_OUTPUT
-          echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> $GITHUB_OUTPUT
+          echo "boost_self=$(basename $GITHUB_WORKSPACE)" >> "$GITHUB_OUTPUT"
+          echo "boost_root=$GITHUB_WORKSPACE/boost-root" >> "$GITHUB_OUTPUT"
 
       - name: Clone boostorg/boost
         run: |