diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 42c04d4..4408b3b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -2,7 +2,7 @@ name: build
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
       - uses: ankane/setup-postgres@v1
@@ -16,6 +16,13 @@ jobs:
           make
           sudo make install
 
+      - run: |
+          git clone --branch 7.10.1 https://github.com/jtv/libpqxx.git
+          cd libpqxx
+          cmake .
+          cmake --build .
+          sudo cmake --install .
+
       - run: cmake -S . -B build -DBUILD_TESTING=ON -DCMAKE_CXX_STANDARD=17
       - run: cmake --build build
       - run: build/test
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f5e98a..4e3beb8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,10 +24,7 @@ if(CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
     option(BUILD_TESTING "" OFF)
 
     if(BUILD_TESTING)
-        include(FetchContent)
-
-        FetchContent_Declare(libpqxx GIT_REPOSITORY https://github.com/jtv/libpqxx.git GIT_TAG 7.10.1)
-        FetchContent_MakeAvailable(libpqxx)
+        find_package(libpqxx REQUIRED)
 
         add_executable(test test/halfvec_test.cpp test/main.cpp test/pqxx_test.cpp test/sparsevec_test.cpp test/vector_test.cpp)
         target_link_libraries(test PRIVATE libpqxx::pqxx pgvector::pgvector)
diff --git a/include/pgvector/pqxx.hpp b/include/pgvector/pqxx.hpp
index 8c0812e..ed1bc62 100644
--- a/include/pgvector/pqxx.hpp
+++ b/include/pgvector/pqxx.hpp
@@ -21,7 +21,7 @@
 /// @cond
 
 namespace pqxx {
-template <> std::string const type_name<pgvector::Vector>{"vector"};
+template <> inline std::string const type_name<pgvector::Vector>{"vector"};
 
 template <> struct nullness<pgvector::Vector> : pqxx::no_null<pgvector::Vector> {};
 
@@ -66,7 +66,7 @@ template <> struct string_traits<pgvector::Vector> {
     }
 };
 
-template <> std::string const type_name<pgvector::HalfVector>{"halfvec"};
+template <> inline std::string const type_name<pgvector::HalfVector>{"halfvec"};
 
 template <> struct nullness<pgvector::HalfVector> : pqxx::no_null<pgvector::HalfVector> {};
 
@@ -111,7 +111,7 @@ template <> struct string_traits<pgvector::HalfVector> {
     }
 };
 
-template <> std::string const type_name<pgvector::SparseVector>{"sparsevec"};
+template <> inline std::string const type_name<pgvector::SparseVector>{"sparsevec"};
 
 template <> struct nullness<pgvector::SparseVector> : pqxx::no_null<pgvector::SparseVector> {};