diff --git a/src/singularity_modules/BEDtools/2.25.0/build.sh b/src/singularity_modules/BEDtools/2.25.0/build.sh
index 668a40c6a89620ba8bcd6e89b367b637d7309d2d..f72bd65650d353e9994fa652cd917da032ac51f6 100755
--- a/src/singularity_modules/BEDtools/2.25.0/build.sh
+++ b/src/singularity_modules/BEDtools/2.25.0/build.sh
@@ -1,2 +1,3 @@
 #/bin/sh
 sudo singularity build --force bin/bedtools:2.25.0.sif src/singularity_modules/BEDtools/2.25.0/BEDtools.def
+singularity sign bin/bedtools:2.25.0.sif
diff --git a/src/singularity_modules/BWA/0.7.17/build.sh b/src/singularity_modules/BWA/0.7.17/build.sh
index 340a8c219741a03182c5832ec78f92f0da3b652a..26b75effd1481f35a21642e90e7e0f99a11d09fd 100755
--- a/src/singularity_modules/BWA/0.7.17/build.sh
+++ b/src/singularity_modules/BWA/0.7.17/build.sh
@@ -1,2 +1,3 @@
 #/bin/sh
 sudo singularity build --force bin/bwa:0.7.17.sif src/singularity_modules/BWA/0.7.17/BWA.def
+singularity sign bin/bwa:0.7.17.sif
diff --git a/src/singularity_modules/Bowtie/1.2.2/Bowtie.def b/src/singularity_modules/Bowtie/1.2.2/Bowtie.def
new file mode 100644
index 0000000000000000000000000000000000000000..79da11614f57813f69f3ac863606e2c5fa69efc8
--- /dev/null
+++ b/src/singularity_modules/Bowtie/1.2.2/Bowtie.def
@@ -0,0 +1,22 @@
+Bootstrap: docker
+From: ubuntu:18.04
+
+%labels
+MAINTAINER Laurent Modolo
+
+%post
+BOWTIE_VERSION=1.2.2
+SAMTOOLS_VERSION=1.7
+PACKAGES="bowtie=${BOWTIE_VERSION}* \
+samtools=${SAMTOOLS_VERSION}*"
+
+apt-get update && \
+apt-get install -y --no-install-recommends ${PACKAGES} && \
+apt-get clean
+
+%environment
+export BOWTIE_VERSION=1.2.2
+export SAMTOOLS_VERSION=1.7
+
+%runscript
+exec /bin/bash "$@"
diff --git a/src/singularity_modules/Bowtie/1.2.2/build.sh b/src/singularity_modules/Bowtie/1.2.2/build.sh
new file mode 100755
index 0000000000000000000000000000000000000000..2c7a0e6c8b1341d03d789db07363f10a4d08c530
--- /dev/null
+++ b/src/singularity_modules/Bowtie/1.2.2/build.sh
@@ -0,0 +1,3 @@
+#/bin/sh
+sudo singularity build --force bin/bowtie:1.2.2.sif src/singularity_modules/Bowtie/1.2.2/Bowtie.def
+singularity sign bin/bowtie:1.2.2.sif
diff --git a/src/singularity_modules/UrQt/d62c1f8/build.sh b/src/singularity_modules/UrQt/d62c1f8/build.sh
index 69aeab4b765864e976ff773394c2d564117fbb2c..e003afadec5d6f75d9fb8e508c743875c7af4cff 100755
--- a/src/singularity_modules/UrQt/d62c1f8/build.sh
+++ b/src/singularity_modules/UrQt/d62c1f8/build.sh
@@ -1,2 +1,3 @@
 #/bin/sh
 sudo singularity build --force bin/UrQt:d62c1f8.sif src/singularity_modules/UrQt/d62c1f8/UrQt.def
+singularity sign bin/UrQt:d62c1f8.sif
diff --git a/src/singularity_modules/sambamba/0.6.7/build.sh b/src/singularity_modules/sambamba/0.6.7/build.sh
index 7afad494b2e479a8a1f2fc297d81ad47b7c39e0e..809fc3710df07fe95755cd544e342137d0297ba5 100755
--- a/src/singularity_modules/sambamba/0.6.7/build.sh
+++ b/src/singularity_modules/sambamba/0.6.7/build.sh
@@ -1,2 +1,3 @@
 #/bin/sh
 sudo singularity build --force bin/sambamba:0.6.7.sif src/singularity_modules/sambamba/0.6.7/sambamba.def
+singularity sign bin/sambamba:0.6.7.sif