diff --git a/src/util/newconfig/ConfigConstraints.cpp b/src/util/newconfig/ConfigConstraints.cpp
index 893cc2755..a45fc8185 100644
--- a/src/util/newconfig/ConfigConstraints.cpp
+++ b/src/util/newconfig/ConfigConstraints.cpp
@@ -22,8 +22,6 @@
 #include "util/newconfig/Error.hpp"
 #include "util/newconfig/Types.hpp"
 
-#include <fmt/core.h>
-
 #include <cstdint>
 #include <optional>
 #include <regex>
diff --git a/src/util/newconfig/ConfigConstraints.hpp b/src/util/newconfig/ConfigConstraints.hpp
index 7fd6b60be..fdfa6969d 100644
--- a/src/util/newconfig/ConfigConstraints.hpp
+++ b/src/util/newconfig/ConfigConstraints.hpp
@@ -88,7 +88,7 @@ class Constraint {
     // see here for more info:
     // https://stackoverflow.com/questions/72835571/constexpr-c-error-destructor-used-before-its-definition
     // https://godbolt.org/z/eMdWThaMY
-    constexpr virtual ~Constraint() noexcept {};
+    constexpr virtual ~Constraint() noexcept = default;
 
     /**
      * @brief Check if the value meets the specific constraint.
@@ -155,9 +155,8 @@ class Constraint {
  */
 class PortConstraint final : public Constraint {
 public:
-    constexpr ~PortConstraint()
-    {
-    }
+    constexpr ~PortConstraint() override
+    = default;
 
 private:
     /**
@@ -187,9 +186,8 @@ class PortConstraint final : public Constraint {
  */
 class ValidIPConstraint final : public Constraint {
 public:
-    constexpr ~ValidIPConstraint()
-    {
-    }
+    constexpr ~ValidIPConstraint() override
+    = default;
 
 private:
     /**
@@ -229,9 +227,8 @@ class OneOf final : public Constraint {
     {
     }
 
-    constexpr ~OneOf()
-    {
-    }
+    constexpr ~OneOf() override
+    = default;
 
 private:
     /**
@@ -285,9 +282,8 @@ class NumberValueConstraint final : public Constraint {
     {
     }
 
-    constexpr ~NumberValueConstraint()
-    {
-    }
+    constexpr ~NumberValueConstraint() override
+    = default;
 
 private:
     /**
@@ -328,9 +324,8 @@ class NumberValueConstraint final : public Constraint {
  */
 class PositiveDouble final : public Constraint {
 public:
-    constexpr ~PositiveDouble()
-    {
-    }
+    constexpr ~PositiveDouble() override
+    = default;
 
 private:
     /**
diff --git a/src/util/newconfig/ConfigFileJson.cpp b/src/util/newconfig/ConfigFileJson.cpp
index 4451eccbd..d59671d38 100644
--- a/src/util/newconfig/ConfigFileJson.cpp
+++ b/src/util/newconfig/ConfigFileJson.cpp
@@ -133,7 +133,7 @@ void
 ConfigFileJson::flattenJson(boost::json::object const& obj, std::string const& prefix)
 {
     for (auto const& [key, value] : obj) {
-        std::string fullKey = prefix.empty() ? std::string(key) : fmt::format("{}.{}", prefix, std::string(key));
+        std::string const fullKey = prefix.empty() ? std::string(key) : fmt::format("{}.{}", prefix, std::string(key));
 
         // In ClioConfigDefinition, value must be a primitive or array
         if (value.is_object()) {
@@ -141,7 +141,7 @@ ConfigFileJson::flattenJson(boost::json::object const& obj, std::string const& p
         } else if (value.is_array()) {
             auto const& arr = value.as_array();
             for (std::size_t i = 0; i < arr.size(); ++i) {
-                std::string arrayPrefix = fullKey + ".[]";
+                std::string const arrayPrefix = fullKey + ".[]";
                 if (arr[i].is_object()) {
                     flattenJson(arr[i].as_object(), arrayPrefix);
                 } else {
diff --git a/tests/unit/util/newconfig/ArrayTests.cpp b/tests/unit/util/newconfig/ArrayTests.cpp
index 98f2ac20a..f3facf2b4 100644
--- a/tests/unit/util/newconfig/ArrayTests.cpp
+++ b/tests/unit/util/newconfig/ArrayTests.cpp
@@ -47,11 +47,11 @@ TEST(ArrayTest, addAndCheckMultipleValues)
     EXPECT_EQ(arr.size(), 3);
 
     auto const cv = arr.at(0);
-    ValueView vv{cv};
+    ValueView const vv{cv};
     EXPECT_EQ(vv.asDouble(), 111.11);
 
     auto const cv2 = arr.at(1);
-    ValueView vv2{cv2};
+    ValueView const vv2{cv2};
     EXPECT_EQ(vv2.asDouble(), 222.22);
 
     EXPECT_EQ(arr.size(), 3);
@@ -59,7 +59,7 @@ TEST(ArrayTest, addAndCheckMultipleValues)
 
     EXPECT_EQ(arr.size(), 4);
     auto const cv4 = arr.at(3);
-    ValueView vv4{cv4};
+    ValueView const vv4{cv4};
     EXPECT_EQ(vv4.asDouble(), 444.44);
 }
 
diff --git a/tests/unit/util/newconfig/ClioConfigDefinitionTests.cpp b/tests/unit/util/newconfig/ClioConfigDefinitionTests.cpp
index e92a7b38f..a7c4eb935 100644
--- a/tests/unit/util/newconfig/ClioConfigDefinitionTests.cpp
+++ b/tests/unit/util/newconfig/ClioConfigDefinitionTests.cpp
@@ -25,11 +25,9 @@
 #include "util/newconfig/Types.hpp"
 #include "util/newconfig/ValueView.hpp"
 
-#include <boost/filesystem/operations.hpp>
 #include <boost/json/object.hpp>
 #include <boost/json/parse.hpp>
 #include <boost/json/value.hpp>
-#include <boost/json/value_to.hpp>
 #include <gtest/gtest.h>
 
 #include <algorithm>
@@ -287,7 +285,7 @@ TEST_F(IncorrectOverrideValues, InvalidJsonErrors)
     EXPECT_TRUE(errors.has_value());
 
     // Expected error messages
-    std::unordered_set<std::string_view> expectedErrors{
+    std::unordered_set<std::string_view> const expectedErrors{
         "dosguard.whitelist.[] value does not match type string",
         "higher.[].low.section key is required in user Config",
         "higher.[].low.admin key is required in user Config",