diff --git a/changelog.txt b/changelog.txt
index 2dc93291..552ca2bb 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -3,6 +3,7 @@ Version: 2.1.14
 Date: ???
   Changes:
     - Fixed that choosing a T.U.R.D. gave an error on new save files
+    - Fixed sulfur processing tech unlocking the gas processing unit twice (https://github.com/pyanodon/pybugreports/issues/366)
 ---------------------------------------------------------------------------------------------------
 Version: 2.1.13
 Date: 2024-1-8
diff --git a/prototypes/updates/pyfusionenergy-updates.lua b/prototypes/updates/pyfusionenergy-updates.lua
index 1bf7cd04..3ba43d0e 100644
--- a/prototypes/updates/pyfusionenergy-updates.lua
+++ b/prototypes/updates/pyfusionenergy-updates.lua
@@ -92,4 +92,8 @@ data.raw.recipe['xyhiphoe-hydrocyclone'].ingredients[2].name = 'arthropod-blood'
 RECIPE('xyhiphoe-hydrocyclone'):remove_unlock('advanced-mining-facilities'):add_unlock('biotech-mk04')
 RECIPE('arthropod-blood-to-organic-solvent'):remove_unlock('biotech-mk03'):add_unlock('biotech-mk02')
 data.raw.item['xyhiphoe-blood-barrel'] = nil
-data.raw.recipe['xyhiphoe-blood-barrel-pyvoid'] = nil
\ No newline at end of file
+data.raw.recipe['xyhiphoe-blood-barrel-pyvoid'] = nil
+
+RECIPE('gas-separator-mk01'):remove_unlock('sulfur-processing')
+RECIPE('gas-separator-mk01'):remove_unlock('sulfur-processing')
+RECIPE('gas-separator-mk01'):add_unlock('sulfur-processing')
\ No newline at end of file