diff --git a/conanfile.py b/conanfile.py
index 515f7902..404a0c00 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -89,7 +89,7 @@ class UnitsConan(ConanFile):
             self.build_requires("Catch2/2.11.0@catchorg/stable")
             # TODO update doxygen to the latest version when available
             self.build_requires("doxygen_installer/1.8.17@bincrafters/stable")
-            self.build_requires("linear_algebra/0.6.0@public-conan/testing")
+            self.build_requires("linear_algebra/0.6.0@public-conan/stable")
 
     def build(self):
         cmake = self._configure_cmake()
diff --git a/example/linear_algebra.cpp b/example/linear_algebra.cpp
index aff85148..b93794c6 100644
--- a/example/linear_algebra.cpp
+++ b/example/linear_algebra.cpp
@@ -33,7 +33,7 @@ template<class ET, class OT>
 std::ostream& operator<<(std::ostream& os, const std::experimental::math::vector<ET, OT>& v)
 {
   os << "|";
-  for (auto i = 0;  i < v.size();  ++i) {
+  for (size_t i = 0;  i < v.size();  ++i) {
     os << fmt::format(" {:>9}", v(i));
   }
   os << " |";
@@ -43,9 +43,9 @@ std::ostream& operator<<(std::ostream& os, const std::experimental::math::vector
 template<class ET, class OT>
 std::ostream& operator<<(std::ostream& os, const std::experimental::math::matrix<ET, OT>& v)
 {
-  for (auto i = 0;  i < v.rows();  ++i) {
+  for (size_t i = 0;  i < v.rows();  ++i) {
     os << "|";
-    for (auto j = 0;  j < v.columns();  ++j) {
+    for (size_t j = 0;  j < v.columns();  ++j) {
       os << fmt::format(" {:>9}", v(i, j));
     }
     os << (i != v.rows() - 1 ? " |\n" : " |");