diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 637aa73..5f8e4d4 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -19,7 +19,7 @@ jobs:
         run: echo ::set-output name=RELEASE_VERSION::${GITHUB_REF##*/}
       - name: Build
         run: |
-          docker run --rm dockbuild/centos7:latest > ./dockbuild \
+          docker run --rm dockbuild/centos5:latest > ./dockbuild \
           && chmod +x ./dockbuild \
           && ./dockbuild -a "-e RELEASE_OS=$RELEASE_OS -e RELEASE_VERSION=$RELEASE_VERSION" bash -c "make -f Makefile.release build && make -f Makefile.release compile_release_$RELEASE_OS"
         env:
diff --git a/dependencies/CppNumericalSolvers-v1/include/cppoptlib/solver/lbfgsbsolver.h b/dependencies/CppNumericalSolvers-v1/include/cppoptlib/solver/lbfgsbsolver.h
index bad97da..d5fbbd9 100644
--- a/dependencies/CppNumericalSolvers-v1/include/cppoptlib/solver/lbfgsbsolver.h
+++ b/dependencies/CppNumericalSolvers-v1/include/cppoptlib/solver/lbfgsbsolver.h
@@ -243,7 +243,7 @@ class LbfgsbSolver : public ISolver<TProblem, 1> {
       TVector x_old = x;
     TVector g_old = g;
       // STEP 2: compute the cauchy point
-      TVector CauchyPoint = TVector::Zero(DIM);
+      TVector CauchyPoint = Superclass::TVector::Zero(DIM);
       VariableTVector c = VariableTVector::Zero(W.cols());
     getGeneralizedCauchyPoint(problem, x, g, CauchyPoint, c);
       // STEP 3: compute a search direction d_k by the primal method for the sub-problem