diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 005aa43b..92b73309 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -80,6 +80,8 @@ ph5.entry_points
       (2) entry points for use by setup.
 ph5.help
  * calls entry_points to print the short descriptions in alpha-order.
+environment.yml
+ * removed unused dependencies and added pykml as a dependency
 
 v4.1.2:
 ph5.utilities.ph5validate
diff --git a/environment.yml b/environment.yml
index 63db2c2a..6a19094e 100644
--- a/environment.yml
+++ b/environment.yml
@@ -1,6 +1,7 @@
 dependencies:
  - python=2.7
  - hdf5=1.8.18
+ - pykml==0.1.0
  - six
  - Cython
  - nose
@@ -12,8 +13,6 @@ dependencies:
  - psutil
  - obspy
  - vispy
- - icu=56.*
- - libxslt=1.1.29=2
  - pip=19.1.1
  - pip:
    - construct==2.5.1