diff --git a/anselm.csv b/anselm.csv
index a8b3827817d331332c2256f5227cf0d2bb7533be..ea9ee728001696569460014c236c78e3972241df 100644
--- a/anselm.csv
+++ b/anselm.csv
@@ -232,6 +232,7 @@ pkg-config/0.29.2,1
 protobuf/3.2.0-foss-2016a,1
 protobuf/3.2.0-Python-3.6.1,1
 renderproto/0.11,1
+squashfs-tools/4.3,1
 xbitmaps/1.1.1,1
 xcb-proto/1.11-Python-2.7.9,1
 xcb-proto/1.11,1
@@ -791,6 +792,7 @@ Singularity/2.2.1-GCC-6.3.0-2.27,1
 Singularity/2.3.1,1
 Singularity/2.3.2,1
 Singularity/2.4,1
+Singularity/2.4.2,1
 Subversion/1.8.16-foss-2015g,1
 Szip/2.1-foss-2016a,1
 Szip/2.1-intel-2015b,1
diff --git a/anselm.md b/anselm.md
index a750b4a6a7ec2bdef3cf2df48ff24dd5e3fea600..dbc070ad610018947a1edba78bd2d4d4fb6d87b9 100644
--- a/anselm.md
+++ b/anselm.md
@@ -117,6 +117,7 @@
 | [SCons](http://www.scons.org/) | SCons is a software construction tool. |
 | [Spack](https://spack.io/) | Spack is a package manager for supercomputers, Linux, and macOS. It makes installing scientific software easy. With Spack, you can build a package with multiple versions, configurations, platforms, and compilers, and all of these builds can coexist on the same machine. |
 | [SQLite](http://www.sqlite.org/) | SQLite: SQL Database Engine in a C Library |
+| [squashfs-tools](http://squashfs.sourceforge.net/) | Squashfs is a compressed read-only filesystem for Linux. |
 | [SWIG](http://www.swig.org/) | SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages. |
 | [xbitmaps](http://www.freedesktop.org/wiki/Software/xlibs) | provides bitmaps for x |
 | [xcb-proto](http://xcb.freedesktop.org/) | The X protocol C-language Binding (XCB) is a replacement for Xlib featuring a small footprint, latency hiding, direct access to the protocol, improved threading support, and extensibility. |