diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7aed886..f28d4cd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -103,7 +103,7 @@ if (ARBUTILS_TESTS)
     CPMAddPackage(
             NAME doctest
             GITHUB_REPOSITORY doctest/doctest
-            GIT_TAG 2.4.0
+            GIT_TAG v2.4.8
             DOWNLOAD_ONLY YES
     )
 
diff --git a/tests/RandomTests.cpp b/tests/RandomTests.cpp
index 4f84f71..a0ac74f 100644
--- a/tests/RandomTests.cpp
+++ b/tests/RandomTests.cpp
@@ -65,7 +65,7 @@ TEST_CASE("Random distribution (max 0, min 1)") {
     }
     for (size_t i = 0; i < size; i++) {
         if (arr[i] != 0)
-            FAIL("We expected a value of 0 here, but got a " + std::to_string(arr[i]));
+            FAIL("We expected a value of 0 here, but got a " << std::to_string(arr[i]));
     }
 }
 
@@ -80,7 +80,7 @@ TEST_CASE("Random distribution (max 0, min 2)") {
     auto numOnes = 0;
     for (size_t i = 0; i < size; i++) {
         if (arr[i] != 0 && arr[i] != 1)
-            FAIL("We expected a value of 0 or 1 here, but got a " + std::to_string(arr[i]));
+            FAIL("We expected a value of 0 or 1 here, but got a " << std::to_string(arr[i]));
         if (arr[i] == 0)
             numZeros++;
         else
@@ -103,7 +103,7 @@ TEST_CASE("Random distribution (max 0, min 3)") {
     auto numTwos = 0;
     for (size_t i = 0; i < size; i++) {
         if (arr[i] != 0 && arr[i] != 1 && arr[i] != 2)
-            FAIL("We expected a value between 0 and 2 here, but got a " + std::to_string(arr[i]));
+            FAIL("We expected a value between 0 and 2 here, but got a " << std::to_string(arr[i]));
         if (arr[i] == 0)
             numZeros++;
         else if (arr[i] == 1)