diff --git a/ci/requirements_appveyor.txt b/ci/requirements_appveyor.txt
index 4ed039c31..82bb6d836 100644
--- a/ci/requirements_appveyor.txt
+++ b/ci/requirements_appveyor.txt
@@ -4,6 +4,6 @@
 wheel
 numpy
 Cython
-lxml
+lxml>=4.6.3
 Pillow
 h5py
\ No newline at end of file
diff --git a/ci/requirements_gh.txt b/ci/requirements_gh.txt
index ae6699325..7ff48b102 100644
--- a/ci/requirements_gh.txt
+++ b/ci/requirements_gh.txt
@@ -11,4 +11,4 @@ numpy; python_version>= '3.6'
 h5py
 cython
 Pillow
-lxml
+lxml>=4.6.3
diff --git a/ci/requirements_rtd.txt b/ci/requirements_rtd.txt
index 68ff8b0f2..c2a696bcc 100644
--- a/ci/requirements_rtd.txt
+++ b/ci/requirements_rtd.txt
@@ -5,5 +5,5 @@ sphinx
 cython
 sphinxcontrib-programoutput
 nbsphinx
-lxml
+lxml>=4.6.3
 pillow
diff --git a/ci/requirements_travis.txt b/ci/requirements_travis.txt
index 12f04af31..1804f98f4 100644
--- a/ci/requirements_travis.txt
+++ b/ci/requirements_travis.txt
@@ -4,9 +4,6 @@
 
 wheel
 h5py
-numpy<1.16.0; python_version == '3.4'
-numpy>=1.16.0; python_version=='2.7' or python_version>='3.5'
 cython
 Pillow
-lxml<4.4.0; python_version == '3.4'
-lxml>=4.4.0; python_version=='2.7' or python_version>='3.5' 
+lxml>=4.6.3 
diff --git a/fabio/ext/dense.pyx b/fabio/ext/dense.pyx
index f1df6cbfc..ce6b5733b 100644
--- a/fabio/ext/dense.pyx
+++ b/fabio/ext/dense.pyx
@@ -31,7 +31,7 @@
 """Densification of sparse frame format
 """
 __author__ = "Jérôme Kieffer"
-__date__ = "18/12/2020"  
+__date__ = "03/05/2021"  
 __contact__ = "Jerome.kieffer@esrf.fr"
 __license__ = "MIT"
 
@@ -126,7 +126,7 @@ def densify(float[:,::1] mask,
         try:
             value = time.time_ns()
         except Exception:
-            value = int(time.time()/EPS64)
+            value = int(time.time()*1e9)
         srand(<unsigned int> (value%RAND_MAX))
                 
     with nogil:
diff --git a/requirements.txt b/requirements.txt
index 01eacd42c..661cc2bcf 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 #List of dependecies used by PIP but also by ReadTheDocs to generate the documentation on the fly
 numpy
 cython
-lxml
+lxml>=4.6.3
 h5py
 hdf5plugin
 sphinx