diff --git a/CMakeLists.txt b/CMakeLists.txt
index fab39f2..7790d39 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ include(ECMSetupVersion)
 include(ECMPackageConfigHelpers)
 
 set(Boost_MIN_VERSION "1.34.0")
-set(LibGMP_MIN_VERSION "6.0.0")
+set(LibGMP_MIN_VERSION "5.1.3")
 set(LibGcrypt_MIN_VERSION "1.4.5")
 set(KF5_MIN_VERSION "5.15")
 set(QT_MIN_VERSION "5.2.0")