diff --git a/.github/workflows/debian.yml b/.github/workflows/debian.yml
index 39ab42761c..0c8479f19d 100644
--- a/.github/workflows/debian.yml
+++ b/.github/workflows/debian.yml
@@ -32,7 +32,7 @@ env:
   # duplication, we define it here using environment variables and create the
   # matrix in the first job. The matrix defined below should be kept in sync
   # with https://github.com/XRPLF/ci/blob/main/.github/workflows/debian.yml.
-  STRATEGY_MATRIX_ARCHITECTURE: |
+  STRATEGY_MATRIX_ARCHITECTURE: >-
     [
       {
           "platform": "linux/amd64",
@@ -43,7 +43,7 @@ env:
           "runner": "ubuntu-24.04-arm"
       }
     ]
-  STRATEGY_MATRIX_OS: |
+  STRATEGY_MATRIX_OS: >-
     [
         {
             "release": "bookworm",
@@ -81,12 +81,12 @@ env:
             "compiler_version": "19"
         }
     ]
-  STRATEGY_MATRIX_BUILDTYPE: |
+  STRATEGY_MATRIX_BUILDTYPE: >-
     [
       "Debug",
       "Release"
     ]
-  STRATEGY_MATRIX_UNITY: |
+  STRATEGY_MATRIX_UNITY: >-
     [
       "-DUnity=OFF",
       "-DUnity=ON"
@@ -101,22 +101,19 @@ jobs:
         id: generate-matrix
         run: |
           # Use heredoc with random delimiter for multiline JSON.
-          DELIMITER_ARCHITECTURE="$(dd bs=512 if=/dev/urandom count=1 2>/dev/null | tr -dc 'a-zA-Z0-9' | head -c 20)"
-          echo "architecture << ${DELIMITER_ARCHITECTURE}
+          DELIMITER="$(openssl rand -hex 8)"
+          echo "architecture << ${DELIMITER}
           ${STRATEGY_MATRIX_ARCHITECTURE}
-          ${DELIMITER_ARCHITECTURE}" >> "$GITHUB_OUTPUT"
-          DELIMITER_OS="$(dd bs=512 if=/dev/urandom count=1 2>/dev/null | tr -dc 'a-zA-Z0-9' | head -c 20)"
-          echo "os << ${DELIMITER_OS}
+          ${DELIMITER}" >> "$GITHUB_OUTPUT"
+          echo "os << ${DELIMITER}
           ${STRATEGY_MATRIX_OS}
-          ${DELIMITER_OS}" >> "$GITHUB_OUTPUT"
-          DELIMITER_BUILDTYPE="$(dd bs=512 if=/dev/urandom count=1 2>/dev/null | tr -dc 'a-zA-Z0-9' | head -c 20)"
-          echo "build_type << ${DELIMITER_BUILDTYPE}
+          ${DELIMITER}" >> "$GITHUB_OUTPUT"
+          echo "build_type << ${DELIMITER}
           ${STRATEGY_MATRIX_BUILDTYPE}
-          ${DELIMITER_BUILDTYPE}" >> "$GITHUB_OUTPUT"
-          DELIMITER_UNITY="$(dd bs=512 if=/dev/urandom count=1 2>/dev/null | tr -dc 'a-zA-Z0-9' | head -c 20)"
-          echo "unity << ${DELIMITER_UNITY}
+          ${DELIMITER}" >> "$GITHUB_OUTPUT"
+          echo "unity << ${DELIMITER}
           ${STRATEGY_MATRIX_UNITY}
-          ${DELIMITER_UNITY}" >> "$GITHUB_OUTPUT"
+          ${DELIMITER}" >> "$GITHUB_OUTPUT"
     outputs:
       architecture: ${{ steps.generate-matrix.outputs.architecture }}
       os: ${{ steps.generate-matrix.outputs.os }}