diff --git a/pkgs/applications/science/biology/samtools/default.nix b/pkgs/applications/science/biology/samtools/default.nix
index 640f32671bb..365057414e9 100644
--- a/pkgs/applications/science/biology/samtools/default.nix
+++ b/pkgs/applications/science/biology/samtools/default.nix
@@ -3,11 +3,11 @@
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
   pname = "samtools";
-  version = "1.6";
+  version = "1.7";
 
   src = fetchurl {
     url = "https://github.com/samtools/samtools/releases/download/${version}/${name}.tar.bz2";
-    sha256 = "17p4vdj2j2qr3b2c0v4100h6cg4jj3zrb4dmdnd9d9aqs74d4p7f";
+    sha256 = "e7b09673176aa32937abd80f95f432809e722f141b5342186dfef6a53df64ca1";
   };
 
   nativeBuildInputs = [ perl ];
diff --git a/pkgs/development/libraries/science/biology/htslib/default.nix b/pkgs/development/libraries/science/biology/htslib/default.nix
index b3c6d9f26d4..2144a7f7893 100644
--- a/pkgs/development/libraries/science/biology/htslib/default.nix
+++ b/pkgs/development/libraries/science/biology/htslib/default.nix
@@ -3,11 +3,11 @@
 stdenv.mkDerivation rec {
   name = "${pname}-${version}";
   pname = "htslib";
-  version = "1.6";
+  version = "1.7";
 
   src = fetchurl {
     url = "https://github.com/samtools/htslib/releases/download/${version}/${name}.tar.bz2";
-    sha256 = "1jsca3hg4rbr6iqq6imkj4lsvgl8g9768bcmny3hlff2w25vx24m";
+    sha256 = "be3d4e25c256acdd41bebb8a7ad55e89bb18e2fc7fc336124b1e2c82ae8886c6";
   };
 
   # perl is only used during the check phase.