diff --git a/etc/requirements.txt b/etc/requirements.txt
index fb38d6a8..f9633a12 100644
--- a/etc/requirements.txt
+++ b/etc/requirements.txt
@@ -3,13 +3,13 @@ Logbook==0.9.0
 
 # Scientific Libraries
 
-pytz==2014.10
+pytz==2015.2
 numpy==1.9.2
 
 # scipy and pandas are required for statsmodels,
 # statsmodels in turn is required for some pandas packages
 scipy==0.15.1
-pandas==0.15.2
+pandas==0.16.0
 # Needed for parts of pandas.stats
 patsy==0.3.0
 statsmodels==0.6.1
@@ -19,7 +19,7 @@ python-dateutil==2.4.1
 six==1.9.0
 
 # For fetching remote data
-requests==2.5.3
+requests==2.6.0
 
 Cython==0.22
 
diff --git a/etc/requirements_dev.txt b/etc/requirements_dev.txt
index 16aa2d60..9da2c3dc 100644
--- a/etc/requirements_dev.txt
+++ b/etc/requirements_dev.txt
@@ -7,9 +7,10 @@ mock==1.0.1
 
 # Linting
 
-flake8==2.3.0
+flake8==2.4.0
 mccabe==0.3
-pep8==1.6.2
+# Note: Old version of pep8 required by flake8 2.4.0
+pep8==1.5.7
 pyflakes==0.8.1
 
 # Documentation Conversion
@@ -17,7 +18,7 @@ pyflakes==0.8.1
 pyandoc==0.0.1
 docopt==0.6.2
 numpydoc==0.5
-mistune==0.5
+mistune==0.5.1
 
 # Example scripts that are run during unit tests use the following:
 
@@ -29,7 +30,7 @@ pyparsing==2.0.3
 backports.ssl-match-hostname==3.4.0.2;python_version<'3.0'
 certifi==14.5.14
 
-Markdown==2.6
+Markdown==2.6.1
 
 # This --allow syntax is for compatibility with pip >= 1.5
 # However, this is backwards incompatible change, since previous