diff --git a/base b/base
index 5d68d88b5..e9b218ef3 160000
--- a/base
+++ b/base
@@ -1 +1 @@
-Subproject commit 5d68d88b543724b043ccbc8b9d3f829cdd4a74c4
+Subproject commit e9b218ef3fcd3fe844565b54d944fa7845564070
diff --git a/doc/Building.md b/doc/Building.md
index 99c126f0c..7f22a01a4 100644
--- a/doc/Building.md
+++ b/doc/Building.md
@@ -15,7 +15,7 @@ To get and compile the source you must have:
 - `autoconf`: version greater than 2.64
 - `bash`: version 4.0 or greater
 - `ccache`: optional, but recommended
-- `cmake`: version 3.15 or greater, 3.20 or greater recommended
+- `cmake`: version 3.17.5 or greater
 - `gettext`
 - `gcc/g++` or `clang/clang++`: with C11 & C++17 support
 - `git`