diff --git a/BUILDING.md b/BUILDING.md
index a37ecb701ef04e..d35211fc43b411 100644
--- a/BUILDING.md
+++ b/BUILDING.md
@@ -41,14 +41,13 @@ platforms in production.
 |--------------|--------------|----------------------------------|----------------------|------------------|
 | GNU/Linux    | Tier 1       | kernel >= 2.6.32, glibc >= 2.12  | x64, arm             |                  |
 | GNU/Linux    | Tier 1       | kernel >= 3.10, glibc >= 2.17    | arm64                |                  |
-| macOS/OS X   | Tier 1       | >= 10.10                         | x64                  |                  |
+| macOS/OS X   | Tier 1       | >= 10.11                         | x64                  |                  |
 | Windows      | Tier 1       | >= Windows 7/2008 R2/2012 R2     | x86, x64             | vs2017           |
 | SmartOS      | Tier 2       | >= 15 < 16.4                     | x86, x64             | see note1        |
 | FreeBSD      | Tier 2       | >= 10                            | x64                  |                  |
 | GNU/Linux    | Tier 2       | kernel >= 3.13.0, glibc >= 2.19  | ppc64le >=power8     |                  |
 | AIX          | Tier 2       | >= 7.1 TL04                      | ppc64be >=power7     |                  |
 | GNU/Linux    | Tier 2       | kernel >= 3.10, glibc >= 2.17    | s390x                |                  |
-| OS X         | Experimental | >= 10.8 < 10.10                  | x64                  | no test coverage |
 | GNU/Linux    | Experimental | kernel >= 2.6.32, glibc >= 2.12  | x86                  | limited CI       |
 | Linux (musl) | Experimental | musl >= 1.0                      | x64                  |                  |