diff --git a/CMakeBBLM.cmake b/CMakeBBLM.cmake
index b60cbcc..9e0db14 100644
--- a/CMakeBBLM.cmake
+++ b/CMakeBBLM.cmake
@@ -1,7 +1,7 @@
 # CMakeBBLM. See https://github.com/sakra/CMakeBBLM
 #
 # This script generates a BBEdit codeless language module for CMake from cmake.plist.in
-# See http://www.barebones.com/support/develop/clm.html
+# See https://www.barebones.com/support/develop/clm.html
 #
 # Copyright (c) 2016-2021 Sascha Kratky
 #
@@ -19,6 +19,9 @@ function(resolve_templates _propNames)
 	if (NOT CMAKE_VERSION VERSION_LESS "3.19.0")
 		list (APPEND _languages "ISPC")
 	endif()
+	if (NOT CMAKE_VERSION VERSION_LESS "3.21.0")
+		list (APPEND _languages "HIP")
+	endif()
 	set (_configurations "None" "Debug" "MinSizeRel" "Release" "RelWithDebInfo")
 	foreach (_unresolvedPropName IN LISTS ARGN)
 		if (_unresolvedPropName MATCHES "<CONFIG>" AND _unresolvedPropName MATCHES "<LANG>")
diff --git a/HISTORY.md b/HISTORY.md
index e7a429e..99eff09 100644
--- a/HISTORY.md
+++ b/HISTORY.md
@@ -1,3 +1,7 @@
+## 1.3.1 (2021-08-13)
+
+* CMake 3.21 compatibility.
+
 ## 1.3.0 (2021-04-05)
 
 * CMake 3.20 compatibility.
diff --git a/README.md b/README.md
index 161b40a..ad8a5f6 100644
--- a/README.md
+++ b/README.md
@@ -29,7 +29,7 @@ module:
 The generated module is tailored to the version of CMake installed on the system, i.e., it will
 only support keywords and predefined names valid for that version.
 
-The install script copies the generated language module to BBEdit's application support folder in
+The installation script copies the generated language module to BBEdit's application support folder in
 the Dropbox data folder or in the user's Library folder.
 
 Usage
diff --git a/install.sh b/install.sh
index a36d6ed..eae3dc2 100755
--- a/install.sh
+++ b/install.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-cd "`dirname \"$0\"`"
+cd "$(dirname "$0")" || exit 1
 
 if [ -n "$(which cmake)" ]; then
 	cmake -P CMakeBBLM.cmake