diff --git a/libgrive/CMakeLists.txt b/libgrive/CMakeLists.txt
index d4d2a14..000d898 100644
--- a/libgrive/CMakeLists.txt
+++ b/libgrive/CMakeLists.txt
@@ -6,7 +6,7 @@ find_package(LibGcrypt REQUIRED)
 find_package(JSONC REQUIRED)
 find_package(CURL REQUIRED)
 find_package(EXPAT REQUIRED)
-find_package(Boost 1.42.0 COMPONENTS filesystem system REQUIRED)
+find_package(Boost 1.40.0 COMPONENTS filesystem system REQUIRED)
 find_package(BFD)
 find_package(CppUnit)
 find_package(Iberty)