diff --git a/var/spack/repos/builtin/packages/htslib/package.py b/var/spack/repos/builtin/packages/htslib/package.py
index ebea84ced6..728dfc4cdd 100644
--- a/var/spack/repos/builtin/packages/htslib/package.py
+++ b/var/spack/repos/builtin/packages/htslib/package.py
@@ -15,6 +15,7 @@ class Htslib(AutotoolsPackage):
     version('1.8', '54e9b3a04251fa59b1878f6b546b5c79')
     version('1.7', 'd3cc7e080a9a8c4161d8f62b56d3b98d')
     version('1.6', 'd6fd14e208aca7e08cbe9072233d0af9')
+    version('1.5', sha256='a02b515ea51d86352b089c63d778fb5e8b9d784937cf157e587189cb97ad922d')
     version('1.4', '2a22ff382654c033c40e4ec3ea880050')
     version('1.3.1', '16d78f90b72f29971b042e8da8be6843')
     version('1.2', '64026d659c3b062cfb6ddc8a38e9779f')
diff --git a/var/spack/repos/builtin/packages/samtools/package.py b/var/spack/repos/builtin/packages/samtools/package.py
index de075bbed7..c2abdce85d 100644
--- a/var/spack/repos/builtin/packages/samtools/package.py
+++ b/var/spack/repos/builtin/packages/samtools/package.py
@@ -18,6 +18,7 @@ class Samtools(Package):
     version('1.8', 'c6e981c92ca00a44656a708c4b52aba3')
     version('1.7', '2240175242b5183bfa6baf1483f68023')
     version('1.6', 'b756f05fd5d1a7042074417edb8c9aea')
+    version('1.5', sha256='8542da26832ee08c1978713f5f6188ff750635b50d8ab126a0c7bb2ac1ae2df6')
     version('1.4', '8cbd7d2a0ec16d834babcd6c6d85d691')
     version('1.3.1', 'a7471aa5a1eb7fc9cc4c6491d73c2d88')
     version('1.2', '988ec4c3058a6ceda36503eebecd4122')
@@ -28,6 +29,7 @@ class Samtools(Package):
     depends_on('htslib@1.8',   when='@1.8')
     depends_on('htslib@1.7',   when='@1.7')
     depends_on('htslib@1.6',   when='@1.6')
+    depends_on('htslib@1.5',   when='@1.5')
     depends_on('htslib@1.4',   when='@1.4')
     depends_on('htslib@1.3.1', when='@1.3.1')
     depends_on('zlib')