diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
new file mode 100644
index 0000000..bd34d6a
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+# Changelog for Data Transloader
+
+## Version 0.5.0 (2019-07-26)
+
+The "HTTP and Ontology" Refactoring Release
+
+* Create HTTP wrapper to abstract away `net/http` from all the other classes
+* Add Vagrantfile for starting a VM with FROST for testing
+* Improve compatibility with HTTPS connections
+* Add a User-Agent for the crawler
+* Replace command line interface with better option parser-based command line interface
+* Add validation checks for command line options
+* Support uploading observations for a time interval instead of a single timestamp
+* RENAME command line options to be closer to their usage in the station classes
+* Use `time` instead of `date`/`datetime` in Ruby
+* Add RDF Ontology file for clearly mapping observed properties from data providers to a standard vocabulary that can be re-used in SensorThings API
+* Import known properties from the providers into the Ontology. Some properties that have not been downloaded in testing may be missing.
+* Add Ontology mappings for Units of Measurement
+* Add Ontology mappings for observation types
+* Move provider-specific classes to subdirectories to clean up parent directory
+* Add allow/block feature for controlling what data/metadata is uploaded to SensorThings API
+
+## Version 0.4.0 (2019-07-12)
+
+The "RSpec" Refactoring Release
+
+* Clean up how station classes are instantiated with `get_station` and `new_station`
+* Refactor the provider class interface to use `get` and `new` terms
+* Improve usage of Ruby named keyword parameters for methods
+* Add some documentation for metadata mapping procedure
+* Fix broken Environment Canada integration due to new station list format (their change)
+* Fix URL used for Data Garrison metadata to prevent bug where metadata was missed
+* Add support for PUT requests to SensorThings API (usage only needed for some STA implementations)
+* Fix wrong URL being cached due to body/header mismatch coming back from STA (GOST)
+* Switch from testing with GOST to SensorUp Scratchpad for better STA support
+* Use RSpec and VCR for integration testing station download/upload
+* Standardize on symbolized keys in station classes to prevent bug where JSON deserialization would create string keys instead
+* Add `semantic_logger` gem for improved logging output
+* Switch from SensorUp Scratchpad to local FROST server for easier resets of testing data
+* Issue another GET request for entity's true selfLink as some STA implementations (FROST) do not include a created entity in the response body
+* Replace calls to `exit` with `raise` to not cause mysterious RSpec failures
+* Fix for `$filter` usage where dates should not be quoted (FROST)
+* Improve reliability of Campbell Scientific download/upload
+* Standardize date format used for specifying uploads
+* Change Campbell Scientific classes to only upload latest observation like the other providers instead of uploading all observations
+
+## Version 0.3.0 (2019-03-07)
+
+The "Campbell Scientific" Support Release
+
+* Move the SensorThings API library to its own directory
+* Support download for Campbell Scientific data
+* Support downloading from specified CSV files for Campbell Scientific
+* Automatically merge downloaded Campbell Scientific data into local cache
+* Support HTTP partial downloads for Campbell Scientific CSV files
+* Increase upload timeouts for long uploads to SensorThings API
+* Support STA upload for Campbell Scientific
+* Fix timezone storage in local cache files
+
+## Version 0.2.0 (2019-02-28)
+
+The "Data Garrison" Support Release
+
+* Support download from Data Garrison data
+* Add warnings for manual data correction requirement
+* Support STA upload for Data Garrison
+
+## Version 0.1.0 (2018-05-09)
+
+The Initial "Environment Canada" Support Release
+
+* Download Environment Canada weather data to cache files
+* Create script to parse command line arguments
+* Download Environment Canada station metadata to cache file
+* Create sub-directories for data, metadata cache
+* Create STA entities from metadata, upload to STA
+* Re-use existing STA entities, if possible
+* Build internal SensorThings API Ruby library
diff --git a/lib/sensorthings/version.rb b/lib/sensorthings/version.rb
index 981ecbb..2562b05 100644
--- a/lib/sensorthings/version.rb
+++ b/lib/sensorthings/version.rb
@@ -1,5 +1,5 @@
 module SensorThings
   def self.version
-    '0.4.0'
+    '0.5.0'
   end
 end
diff --git a/lib/transloader/version.rb b/lib/transloader/version.rb
index 2c8d39e..5cfb494 100644
--- a/lib/transloader/version.rb
+++ b/lib/transloader/version.rb
@@ -1,5 +1,5 @@
 module Transloader
   def self.version
-    '0.4.0'
+    '0.5.0'
   end
 end