diff --git a/CMakeLists.txt b/CMakeLists.txt
index 109202018..196d3ce71 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -386,8 +386,8 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
     OUTPUT_VARIABLE _ICINGA2_COMPILER_VERSION
   )
 
-  if("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "6.3.0")
-    message(FATAL_ERROR "Your version of GCC (${CMAKE_CXX_COMPILER_VERSION}) is too old for building Icinga 2 (GCC >= 6.3.0 is required).")
+  if("${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS "7.0.0")
+    message(FATAL_ERROR "Your version of GCC (${CMAKE_CXX_COMPILER_VERSION}) is too old for building Icinga 2 (GCC >= 7.0.0 is required).")
   endif()
 endif()
 
diff --git a/doc/21-development.md b/doc/21-development.md
index dae57485c..c25ae839a 100644
--- a/doc/21-development.md
+++ b/doc/21-development.md
@@ -2173,7 +2173,7 @@ Icinga application using a dist tarball (including notes for distributions):
 * cmake >= 2.6
 * GNU make (make) or ninja-build
 * C++ compiler which supports C++14
-    * RHEL/Fedora/SUSE: gcc-c++ >= 6.3 (extra Developer Tools on RHEL7 see below)
+    * RHEL/Fedora/SUSE: gcc-c++ >= 7 (extra Developer Tools on RHEL7 see below)
     * Debian/Ubuntu: build-essential
     * Alpine: build-base
     * you can also use clang++