diff --git a/data/special-requirements b/data/special-requirements
index f5a98d2..c0cc331 100644
--- a/data/special-requirements
+++ b/data/special-requirements
@@ -14,3 +14,4 @@ sodium !jessie
 sqlsrv !7.1-alpine3.9 !7.1-alpine3.10
 vips !alpine3.9 !jessie
 wikidiff2 !jessie !stretch
+xpass !buster
diff --git a/data/supported-extensions b/data/supported-extensions
index 7097e58..5859385 100644
--- a/data/supported-extensions
+++ b/data/supported-extensions
@@ -136,6 +136,7 @@ xhprof 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
 xlswriter 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
 xmldiff 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3
 xmlrpc 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
+xpass 8.0 8.1 8.2 8.3 8.4
 xsl 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
 yac 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
 yaml 5.5 5.6 7.0 7.1 7.2 7.3 7.4 8.0 8.1 8.2 8.3 8.4
diff --git a/install-php-extensions b/install-php-extensions
index 73d8be8..29e0e07 100755
--- a/install-php-extensions
+++ b/install-php-extensions
@@ -1554,6 +1554,12 @@ buildRequiredPackageLists() {
 			xmlrpc@debian)
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libxml2-dev"
 				;;
+			xpass@alpine)
+				if ! isLibXCryptInstalled; then
+					buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile linux-headers"
+					COMPILE_LIBS="$COMPILE_LIBS libxcrypt"
+				fi
+				;;
 			xsl@alpine)
 				buildRequiredPackageLists_persistent="$buildRequiredPackageLists_persistent libxslt"
 				buildRequiredPackageLists_volatile="$buildRequiredPackageLists_volatile libxslt-dev libgcrypt-dev"
@@ -2423,6 +2429,25 @@ installFirebird() {
 		cd - >/dev/null
 	fi
 }
+
+isLibXCryptInstalled() {
+	if ! test -f /usr/local/lib/libcrypt.so && ! test -f /usr/lib/libcrypt.so && ! test -f /usr/lib/x86_64*/libcrypt.so; then
+		return 1
+	fi
+	return 0
+}
+
+installLibXCrypt() {
+	printf 'Installing libxcrypt\n'
+	installLibXCrypt_version=4.4.36
+	installLibXCrypt_src="$(getPackageSource "https://github.com/besser82/libxcrypt/releases/download/v$installLibXCrypt_version/libxcrypt-$installLibXCrypt_version.tar.xz")"
+	cd -- "$installLibXCrypt_src"
+	./configure --prefix /usr
+	make -j$(getProcessorCount)
+	make install
+	cd - >/dev/null
+}
+
 # Install Composer
 installComposer() {
 	installComposer_version="$(getWantedPHPModuleVersion @composer)"
@@ -2618,6 +2643,9 @@ compileLibs() {
 	if stringInList firebird "$COMPILE_LIBS"; then
 		installFirebird
 	fi
+	if stringInList libxcrypt "$COMPILE_LIBS"; then
+		installLibXCrypt
+	fi
 }
 
 # Install a bundled PHP module given its handle