diff --git a/CHANGES.md b/CHANGES.md
index 65d1f3ce8..3e48b708f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,7 +1,11 @@
-## Version 2.0.0.dev26 (in development)
+## Version 2.0.0.dev26
 
 * Fixed a display problem where spatial subsets of datasets appeared shifted on the 3D globe view
   [#817](https://github.com/CCI-Tools/cate/issues/817)
+* Cate now depends on gdal 2.3.3 and geos 3.7.1 to solve failed installation issue 
+  [#843](https://github.com/CCI-Tools/cate/issues/843) and possibly [#842](https://github.com/CCI-Tools/cate/issues/842)
+* Fixed a dependency issue caused by fiona by removing defaults channel (and consequently using only conda-forge channel)
+  [#839](https://github.com/CCI-Tools/cate/issues/839)
 
 ## Version 2.0.0.dev25
 
diff --git a/environment.yml b/environment.yml
index 766948467..ea4dbff35 100644
--- a/environment.yml
+++ b/environment.yml
@@ -1,10 +1,9 @@
 name: cate-env
 channels:
   - conda-forge
-  - defaults
 dependencies:
   - python=3.7
-  - conda=4.5
+  - conda=4.6
   # Runtime libs
   - bokeh=1.0.2
   - boto3=1.9.65
@@ -13,9 +12,9 @@ dependencies:
   - cython=0.29.2
   - dask=1.0.0
   - fiona=1.8.4
-  - gdal=2.3.2
+  - gdal=2.3.3
   - geopandas=0.4.0
-  - geos=3.7.0
+  - geos=3.7.1
   - geotiff=1.4.2
   - h5netcdf=0.6.2
   - h5py=2.8.0