diff --git a/.github/workflows/go.yml b/.github/workflows/go.yml
index c3aad07..70e64c9 100644
--- a/.github/workflows/go.yml
+++ b/.github/workflows/go.yml
@@ -27,7 +27,7 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 19
+        if: matrix.llvm == 21
         run:
           go test -v
   test-linux:
@@ -52,7 +52,7 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 19
+        if: matrix.llvm == 21
         run:
           go test -v
   test-linux-fedora:
@@ -75,6 +75,6 @@ jobs:
         run:
           go test -v -tags=llvm${{ matrix.llvm }}
       - name: Test default LLVM
-        if: matrix.llvm == 19
+        if: matrix.llvm == 21
         run:
           go test -v
diff --git a/README.markdown b/README.markdown
index e66c391..2ae79aa 100644
--- a/README.markdown
+++ b/README.markdown
@@ -11,12 +11,12 @@ This library provides bindings to a system-installed LLVM.
 
 Currently supported:
 
-  * LLVM 20, 19, 18, 17, 16, 15 and 14 from [apt.llvm.org](http://apt.llvm.org/) on Debian/Ubuntu.
-  * LLVM 20, 19, 18, 17, 16, 15 and 14 from Homebrew on macOS.
+  * LLVM 22, 21, 20, 19, 18, 17, 16, 15 and 14 from [apt.llvm.org](http://apt.llvm.org/) on Debian/Ubuntu.
+  * LLVM 22, 21, 20, 19, 18, 17, 16, 15 and 14 from Homebrew on macOS.
   * Any of the above versions with a manually built LLVM through the `byollvm` build tag. You need to set up `CFLAGS`/`LDFLAGS` etc yourself in this case.
 
-You can select the LLVM version using a build tag, for example `-tags=llvm17`
-to use LLVM 17.
+LLVM 21 is selected by default. You can select another LLVM version using a
+build tag, for example `-tags=llvm19` to use LLVM 19.
 
 ## Usage
 
diff --git a/llvm_config_llvm19.go b/llvm_config_llvm19.go
index fea3f0b..ac184ea 100644
--- a/llvm_config_llvm19.go
+++ b/llvm_config_llvm19.go
@@ -1,5 +1,5 @@
-//go:build !byollvm && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm20 && !llvm21 && !llvm22
-// +build !byollvm,!llvm14,!llvm15,!llvm16,!llvm17,!llvm18,!llvm20,!llvm21,!llvm22
+//go:build !byollvm && llvm19
+// +build !byollvm,llvm19
 
 package llvm
 
diff --git a/llvm_config_llvm21.go b/llvm_config_llvm21.go
index 263c2fc..a37ae23 100644
--- a/llvm_config_llvm21.go
+++ b/llvm_config_llvm21.go
@@ -1,4 +1,5 @@
-//go:build !byollvm && llvm21
+//go:build !byollvm && !llvm14 && !llvm15 && !llvm16 && !llvm17 && !llvm18 && !llvm19 && !llvm20 && !llvm22
+// +build !byollvm,!llvm14,!llvm15,!llvm16,!llvm17,!llvm18,!llvm19,!llvm20,!llvm22
 
 package llvm