diff --git a/cmake_integration_test/common/test_app.cpp b/cmake_integration_test/common/test_app.cpp
index 12fdd4b..ff3e626 100644
--- a/cmake_integration_test/common/test_app.cpp
+++ b/cmake_integration_test/common/test_app.cpp
@@ -1,6 +1,6 @@
 #include <libenvpp/env.hpp>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 int main()
 {
diff --git a/include/libenvpp/detail/check.hpp b/include/libenvpp/detail/check.hpp
index 5e3fb60..fc3d499 100644
--- a/include/libenvpp/detail/check.hpp
+++ b/include/libenvpp/detail/check.hpp
@@ -4,7 +4,7 @@
 #include <string>
 #include <string_view>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #ifndef LIBENVPP_STRINGIFY
 #define LIBENVPP_STRINGIFY_HELPER(expression) #expression
diff --git a/include/libenvpp/detail/parser.hpp b/include/libenvpp/detail/parser.hpp
index 6fcc352..f5de5fc 100644
--- a/include/libenvpp/detail/parser.hpp
+++ b/include/libenvpp/detail/parser.hpp
@@ -10,7 +10,7 @@
 #include <type_traits>
 #include <utility>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/errors.hpp>
 #include <libenvpp/detail/expected.hpp>
diff --git a/include/libenvpp/env.hpp b/include/libenvpp/env.hpp
index e5a72dc..a255d58 100644
--- a/include/libenvpp/env.hpp
+++ b/include/libenvpp/env.hpp
@@ -13,7 +13,7 @@
 #include <utility>
 #include <vector>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 #include <fmt/ranges.h>
 
 #include <libenvpp/detail/edit_distance.hpp>
diff --git a/source/libenvpp_errors.cpp b/source/libenvpp_errors.cpp
index ea509db..4aafadd 100644
--- a/source/libenvpp_errors.cpp
+++ b/source/libenvpp_errors.cpp
@@ -1,6 +1,6 @@
 #include <libenvpp/detail/errors.hpp>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/environment.hpp>
 
diff --git a/source/libenvpp_testing.cpp b/source/libenvpp_testing.cpp
index f37282e..0b69579 100644
--- a/source/libenvpp_testing.cpp
+++ b/source/libenvpp_testing.cpp
@@ -1,6 +1,6 @@
 #include <libenvpp/detail/testing.hpp>
 
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/errors.hpp>
 
diff --git a/test/libenvpp_parser_test.cpp b/test/libenvpp_parser_test.cpp
index 4c61425..1d4c42a 100644
--- a/test/libenvpp_parser_test.cpp
+++ b/test/libenvpp_parser_test.cpp
@@ -5,7 +5,7 @@
 
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/matchers/catch_matchers_string.hpp>
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/parser.hpp>
 
diff --git a/test/libenvpp_test.cpp b/test/libenvpp_test.cpp
index a3e56be..920f9c8 100644
--- a/test/libenvpp_test.cpp
+++ b/test/libenvpp_test.cpp
@@ -5,7 +5,7 @@
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/generators/catch_generators.hpp>
 #include <catch2/matchers/catch_matchers_all.hpp>
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/environment.hpp>
 #include <libenvpp/env.hpp>
diff --git a/test/libenvpp_testing_test.cpp b/test/libenvpp_testing_test.cpp
index bfad658..4928dda 100644
--- a/test/libenvpp_testing_test.cpp
+++ b/test/libenvpp_testing_test.cpp
@@ -5,7 +5,7 @@
 
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/matchers/catch_matchers_all.hpp>
-#include <fmt/core.h>
+#include <fmt/format.h>
 
 #include <libenvpp/detail/environment.hpp>
 #include <libenvpp/env.hpp>