diff --git a/.github/workflows/abi-checker.yml b/.github/workflows/abi-checker.yml
index 3eb5343fd..96c274a5c 100644
--- a/.github/workflows/abi-checker.yml
+++ b/.github/workflows/abi-checker.yml
@@ -30,7 +30,6 @@ jobs:
 
       - name: "Prepare environment"
         run: |
-          sudo sed -i '/deb-src/s/^# //' /etc/apt/sources.list
           sudo apt-get update -q -y
           sudo apt-get install -q -y \
             devscripts \
diff --git a/.github/workflows/alt-architectures.yml b/.github/workflows/alt-architectures.yml
index 0d7f64f4f..1a7fc74b4 100644
--- a/.github/workflows/alt-architectures.yml
+++ b/.github/workflows/alt-architectures.yml
@@ -38,7 +38,6 @@ jobs:
             CTEST_OUTPUT_ON_FAILURE: 1
             WLOG_LEVEL: 'trace'
           install: |
-            sed -i '/deb-src/s/^# //' /etc/apt/sources.list
             apt-get update -q -y
             apt-get install -q -y \
               devscripts \
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index f79691b08..4e5bb7b98 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -78,7 +78,6 @@ jobs:
     # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
     - if: matrix.build-mode == 'manual'
       run: |
-        sudo sed -i '/deb-src/s/^# //' /etc/apt/sources.list
         sudo apt update
         sudo apt-get install -q -y \
               devscripts \
diff --git a/.github/workflows/coverity.yml b/.github/workflows/coverity.yml
index 3d165bdb2..60950f716 100644
--- a/.github/workflows/coverity.yml
+++ b/.github/workflows/coverity.yml
@@ -17,7 +17,6 @@ jobs:
     - uses: actions/checkout@v4
     - name: Install apt dependencies
       run: |
-        sudo sed -i '/deb-src/s/^# //' /etc/apt/sources.list
         sudo apt-get update
         sudo apt-get install -q -y \
               devscripts \
diff --git a/.github/workflows/mingw.yml b/.github/workflows/mingw.yml
index be0852253..d7920c944 100644
--- a/.github/workflows/mingw.yml
+++ b/.github/workflows/mingw.yml
@@ -15,7 +15,6 @@ jobs:
 
       - name: "Prepare environment"
         run: |
-          sed -i '/deb-src/s/^# //' /etc/apt/sources.list
           sudo apt-get update -q -y
           sudo apt-get install -q -y \
             git \