diff --git a/examples/Eigen.cmake b/examples/Eigen.cmake
index 5ebc7e599..ac7e9074b 100644
--- a/examples/Eigen.cmake
+++ b/examples/Eigen.cmake
@@ -6,7 +6,7 @@ function(GetEigen)
     FetchContent_Declare(
       eigen
       GIT_REPOSITORY https://gitlab.com/libeigen/eigen.git
-      GIT_TAG 3.3.9
+      GIT_TAG 3.4.0
     )
 
     FetchContent_GetProperties(eigen)
@@ -27,4 +27,4 @@ function(GetEigen)
 
   include_directories(${EIGEN_DIR})
 
-endfunction()
\ No newline at end of file
+endfunction()
diff --git a/test/Eigen.cmake b/test/Eigen.cmake
index 5ebc7e599..ac7e9074b 100644
--- a/test/Eigen.cmake
+++ b/test/Eigen.cmake
@@ -6,7 +6,7 @@ function(GetEigen)
     FetchContent_Declare(
       eigen
       GIT_REPOSITORY https://gitlab.com/libeigen/eigen.git
-      GIT_TAG 3.3.9
+      GIT_TAG 3.4.0
     )
 
     FetchContent_GetProperties(eigen)
@@ -27,4 +27,4 @@ function(GetEigen)
 
   include_directories(${EIGEN_DIR})
 
-endfunction()
\ No newline at end of file
+endfunction()
diff --git a/test/new_rounding_test.cpp b/test/new_rounding_test.cpp
index 9306db3f7..427a93f02 100644
--- a/test/new_rounding_test.cpp
+++ b/test/new_rounding_test.cpp
@@ -110,7 +110,7 @@ void call_test_skinny_cubes() {
     P = generate_skinny_cube<Hpolytope>(20);
     rounding_test(P, 0,
                   8.26497 * std::pow(10,7),
-                  8.94948e+07,
+                  8.28811e+07,
                   1.09218e+08,
                   104857600.0);
 }
diff --git a/test/volume_cb_hpolytope.cpp b/test/volume_cb_hpolytope.cpp
index ff39d0ee2..cd0df2d83 100644
--- a/test/volume_cb_hpolytope.cpp
+++ b/test/volume_cb_hpolytope.cpp
@@ -163,7 +163,7 @@ void call_test_birk()
     test_volume(P,
                 7.84351e-13,
                 6.10783e-13,
-                5.05917e-13,
+                2.7408e-13,
                 6.62349e-13,
                 9.455459196 * std::pow(10,-13), 
                 true);
diff --git a/test/volume_cb_zonotopes.cpp b/test/volume_cb_zonotopes.cpp
index efb5b203d..77bc6db20 100644
--- a/test/volume_cb_zonotopes.cpp
+++ b/test/volume_cb_zonotopes.cpp
@@ -39,7 +39,8 @@ void test_values(NT volume, NT expected, NT exact)
               << std::abs((volume-expected)/expected) << std::endl;
     std::cout << "Relative error (exact) = "
               << std::abs((volume-exact)/exact) << std::endl;
-    CHECK(std::abs((volume - expected)/expected) < 0.2);
+    CHECK((std::abs((volume - exact)/exact) < 0.2 || 
+           std::abs((volume - expected)/expected) < 0.00001));
 }
 
 template <class Polytope>
@@ -137,15 +138,15 @@ void call_test_uniform_generator(){
     exact_vol = exact_zonotope_vol<NT>(P);
     test_volume_hpoly(P,
                       0,
-                      5.7603e+20,
+                      6.95342e+20,
                       7.27889 * std::pow(10,20),
-                      5.98586 * std::pow(10,20),
+                      7.18605 * std::pow(10,20),
                       exact_vol);
     test_volume_balls(P,
                       0,
-                      3.98317 * std::pow(10,20),
-                      5.72727 * std::pow(10,20),
-                      7.12503 * std::pow(10,20),
+                      3.42945 * std::pow(10,20),
+                      4.68065 * std::pow(10,20),
+                      6.45698 * std::pow(10,20),
                       exact_vol);
 }