diff --git a/.github/workflows/linux-full-tests.yml b/.github/workflows/linux-full-tests.yml
index 12ad1f30e1b..527dc395e37 100644
--- a/.github/workflows/linux-full-tests.yml
+++ b/.github/workflows/linux-full-tests.yml
@@ -40,7 +40,7 @@ jobs:
             tag: hirsute
             cc: gcc
             cxx: g++
-          - name: "gcc 11.x (Boost 1.82)"
+          - name: "gcc 11.4 (Boost 1.82)"
             shortname: gcc11
             tag: jammy
             cc: gcc
@@ -196,21 +196,13 @@ jobs:
     container: ghcr.io/lballabio/quantlib-devenv:${{ matrix.tag }}
     steps:
     - uses: actions/checkout@v3
-    - name: Cache
-      uses: hendrikmuhs/ccache-action@v1.2
-      with:
-        key: linux-ci-build-${{ matrix.shortname }}-${{ github.ref }}
-        restore-keys: |
-          linux-ci-build-${{ matrix.shortname }}-${{ github.ref }}
-          linux-ci-build-${{ matrix.shortname }}-refs/heads/master
-          linux-ci-build-${{ matrix.shortname }}-
     - name: Compiler version
       run: |
         ${{ matrix.cc }} --version
     - name: Build
       run: |
         ./autogen.sh
-        ./configure --disable-static ${{ matrix.configureflags }} CC="ccache ${{ matrix.cc }}" CXX="ccache ${{ matrix.cxx }}" CXXFLAGS="-O2 -g0 -Wall -Wno-unknown-pragmas -Werror ${{ matrix.cxxflags }}"
+        ./configure --disable-static ${{ matrix.configureflags }} CC="${{ matrix.cc }}" CXX="${{ matrix.cxx }}" CXXFLAGS="-O2 -g0 -Wall -Wno-unknown-pragmas -Werror ${{ matrix.cxxflags }}"
         make -j 4
     - name: Run tests
       run: |
diff --git a/.github/workflows/linux-nondefault.yml b/.github/workflows/linux-nondefault.yml
index d3e03fcb1a3..d7ad3f92632 100644
--- a/.github/workflows/linux-nondefault.yml
+++ b/.github/workflows/linux-nondefault.yml
@@ -40,7 +40,7 @@ jobs:
             tag: hirsute
             cc: gcc
             cxx: g++
-          - name: "gcc 11.x (Boost 1.82)"
+          - name: "gcc 11.4 (Boost 1.82)"
             shortname: gcc11
             tag: jammy
             cc: gcc
diff --git a/.github/workflows/linux.yml b/.github/workflows/linux.yml
index 537cb16a5c3..32f8632397d 100644
--- a/.github/workflows/linux.yml
+++ b/.github/workflows/linux.yml
@@ -7,21 +7,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: "gcc 5.4 (Boost 1.66)"
-            shortname: gcc5
-            tag: xenial
-            cc: gcc
-            cxx: g++
-          - name: "gcc 6.3 (Boost 1.66)"
-            shortname: gcc6
-            tag: zesty
-            cc: gcc
-            cxx: g++
-          - name: "gcc 7.4 (Boost 1.72)"
-            shortname: gcc7
-            tag: bionic
-            cc: gcc
-            cxx: g++
           - name: "gcc 8.3 (Boost 1.72)"
             shortname: gcc8
             tag: cosmic
@@ -37,7 +22,7 @@ jobs:
             tag: hirsute
             cc: gcc
             cxx: g++
-          - name: "gcc 11.x (Boost 1.82)"
+          - name: "gcc 11.4 (Boost 1.82)"
             shortname: gcc11
             tag: jammy
             cc: gcc
@@ -54,11 +39,6 @@ jobs:
             cc: gcc
             cxx: g++
             tests: true
-          - name: "Clang 6 (Boost 1.72)"
-            shortname: clang6
-            tag: bionic
-            cc: clang
-            cxx: clang++
           - name: "Clang 7 (Boost 1.72)"
             shortname: clang7
             tag: cosmic