diff --git a/README.md b/README.md
index 27942b5..fe28fca 100644
--- a/README.md
+++ b/README.md
@@ -85,15 +85,15 @@ These are made available to subsequent workflow steps via the [`GITHUB_ENV` envi
 Support for the GCC toolchain varies across GitHub-hosted runner images.
 
 <!-- compat starts -->
-| runner       | 6       | 7       | 8       | 9       | 10      | 11      | 12      |
-|:-------------|:--------|:--------|:--------|:--------|:--------|:--------|:--------|
-| macos-11     | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
-| macos-12     | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
-| macos-13     | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
-| ubuntu-20.04 |      | &check; | &check; | &check; | &check; | &check; |      |
-| ubuntu-22.04 |      |      |      | &check; | &check; | &check; | &check; |
-| windows-2019 |      |      | &check; | &check; | &check; | &check; | &check; |
-| windows-2022 |      |      | &check; | &check; | &check; | &check; | &check; |
+| runner       | 6       | 7       | 8       | 9       | 10      | 11      | 12      | 13      |
+|:-------------|:--------|:--------|:--------|:--------|:--------|:--------|:--------|:--------|
+| macos-11     | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
+| macos-12     | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
+| macos-13     | &check; | &check; | &check; | &check; | &check; | &check; | &check; | &check; |
+| ubuntu-20.04 |      | &check; | &check; | &check; | &check; | &check; |      | &check; |
+| ubuntu-22.04 |      |      |      | &check; | &check; | &check; | &check; | &check; |
+| windows-2019 |      |      | &check; | &check; | &check; | &check; | &check; |      |
+| windows-2022 |      |      | &check; | &check; | &check; | &check; | &check; |      |
 <!-- compat ends -->
 
 **Note:** version 13 of the GNU toolchain is not yet available on Windows.
diff --git a/compat.csv b/compat.csv
index 5c6431d..0a9f945 100644
--- a/compat.csv
+++ b/compat.csv
@@ -1,8 +1,8 @@
-runner,6,7,8,9,10,11,12
-macos-11,&check;,&check;,&check;,&check;,&check;,&check;,&check;
-macos-12,&check;,&check;,&check;,&check;,&check;,&check;,&check;
-macos-13,&check;,&check;,&check;,&check;,&check;,&check;,&check;
-ubuntu-20.04,,&check;,&check;,&check;,&check;,&check;,
-ubuntu-22.04,,,,&check;,&check;,&check;,&check;
-windows-2019,,,&check;,&check;,&check;,&check;,&check;
-windows-2022,,,&check;,&check;,&check;,&check;,&check;
+runner,6,7,8,9,10,11,12,13
+macos-11,&check;,&check;,&check;,&check;,&check;,&check;,&check;,&check;
+macos-12,&check;,&check;,&check;,&check;,&check;,&check;,&check;,&check;
+macos-13,&check;,&check;,&check;,&check;,&check;,&check;,&check;,&check;
+ubuntu-20.04,,&check;,&check;,&check;,&check;,&check;,,&check;
+ubuntu-22.04,,,,&check;,&check;,&check;,&check;,&check;
+windows-2019,,,&check;,&check;,&check;,&check;,&check;,
+windows-2022,,,&check;,&check;,&check;,&check;,&check;,