diff --git a/.github/workflows/container.yml b/.github/workflows/container.yml
index 12e3564..1c43b51 100644
--- a/.github/workflows/container.yml
+++ b/.github/workflows/container.yml
@@ -172,10 +172,6 @@ jobs:
             -e OPDS_SHOW_ONLY_DOWNLOADED_CHAPTERS=true \
             -e OPDS_CHAPTER_SORT_ORDER=ASC \
             -e OPDS_CBZ_MIME_TYPE=LEGACY \
-            -e KOREADER_SYNC_SERVER_URL=http://koreader:17200 \
-            -e KOREADER_SYNC_USERNAME=manga \
-            -e KOREADER_SYNC_USERKEY=hello123 \
-            -e KOREADER_SYNC_DEVICE_ID=100 \
             -e KOREADER_SYNC_CHECKSUM_METHOD=filename \
             -e KOREADER_SYNC_PERCENTAGE_TOLERANCE=0.001 \
             -e KOREADER_SYNC_STRATEGY_FORWARD=disabled \
diff --git a/README.md b/README.md
index 119687d..15ee308 100644
--- a/README.md
+++ b/README.md
@@ -98,10 +98,6 @@ There are a number of environment variables available to configure Suwayomi:
 | **OPDS_SHOW_ONLY_DOWNLOADED_CHAPTERS**  |                `false`                 |                                                                                                                                            Filter manga feed to display only chapters you have downloaded                                                                                                                                            |
 |       **OPDS_CHAPTER_SORT_ORDER**       |                 `DESC`                 |                                                                                                                                                                   `DESC` or `ASC`                                                                                                                                                                    |
 |         **OPDS_CBZ_MIME_TYPE**          |                `MODERN`                | `MODERN` or `LEGACY` or `COMPATIBLE`. Controls the MimeType that Suwayomi sends in OPDS entries for CBZ archives. Also affects global CBZ download. Modern follows recent IANA standard (2017), while LEGACY (deprecated mimetype for .cbz) and COMPATIBLE (deprecated mimetype for all comic archives) might be more compatible with older clients. |
-|      **KOREADER_SYNC_SERVER_URL**       |     `https://sync.koreader.rocks/`     |                                                                                                                                                         The URL of the KOReader Sync server                                                                                                                                                          |
-|       **KOREADER_SYNC_USERNAME**        |                  ` `                   |                                                                                                                                                                KOReader Sync UserName                                                                                                                                                                |
-|        **KOREADER_SYNC_USERKEY**        |                  ` `                   |                                                                                                                                                                KOReader Sync UserKey                                                                                                                                                                 |
-|       **KOREADER_SYNC_DEVICE_ID**       |                  ` `                   |                                                                                                                                                              The Device-ID for KOReader                                                                                                                                                              |
 |    **KOREADER_SYNC_CHECKSUM_METHOD**    |                `binary`                |                                                                                                                                                                `binary` or `filename`                                                                                                                                                                |
 | **KOREADER_SYNC_PERCENTAGE_TOLERANCE**  |           `0.00000000000001`           |                                                                                                                                     Absolute tolerance for progress comparison from 1 (widest) to 1e-15 (strict)                                                                                                                                     |
 |   **KOREADER_SYNC_STRATEGY_FORWARD**    |                `prompt`                |                                                                                                                                                  `prompt`, `keep_local`, `keep_remote`, `disabled`                                                                                                                                                   |
diff --git a/scripts/startup_script.sh b/scripts/startup_script.sh
index 759564a..60a17f5 100755
--- a/scripts/startup_script.sh
+++ b/scripts/startup_script.sh
@@ -121,10 +121,6 @@ sed -i -r "s/server.opdsChapterSortOrder = \"*([a-zA-Z0-9_]+)\"*( #)?/server.opd
 sed -i -r "s/server.opdsCbzMimetype = \"*([a-zA-Z0-9_]+)\"*( #)?/server.opdsCbzMimetype = ${OPDS_CBZ_MIME_TYPE:-\1} #/" /home/suwayomi/.local/share/Tachidesk/server.conf
 
 # koreader
-sed -i -r "s|server.koreaderSyncServerUrl = \"(.*?)\"( #)?|server.koreaderSyncServerUrl = \"${KOREADER_SYNC_SERVER_URL:-\1}\" #|" /home/suwayomi/.local/share/Tachidesk/server.conf
-sed -i -r "s/server.koreaderSyncUsername = \"(.*?)\"( #)?/server.koreaderSyncUsername = \"${KOREADER_SYNC_USERNAME:-\1}\" #/" /home/suwayomi/.local/share/Tachidesk/server.conf
-sed -i -r "s/server.koreaderSyncUserkey = \"(.*?)\"( #)?/server.koreaderSyncUserkey = \"${KOREADER_SYNC_USERKEY:-\1}\" #/" /home/suwayomi/.local/share/Tachidesk/server.conf
-sed -i -r "s/server.koreaderSyncDeviceId = \"(.*?)\"( #)?/server.koreaderSyncDeviceId = \"${KOREADER_SYNC_DEVICE_ID:-\1}\" #/" /home/suwayomi/.local/share/Tachidesk/server.conf
 sed -i -r "s/server.koreaderSyncChecksumMethod = \"*([a-zA-Z0-9_]+)\"*( #)?/server.koreaderSyncChecksumMethod = ${KOREADER_SYNC_CHECKSUM_METHOD:-\1} #/" /home/suwayomi/.local/share/Tachidesk/server.conf
 sed -i -r "s/server.koreaderSyncPercentageTolerance = ([-0-9\.Ee]+)?( #)/server.koreaderSyncPercentageTolerance = ${KOREADER_SYNC_PERCENTAGE_TOLERANCE:-\1} #/" /home/suwayomi/.local/share/Tachidesk/server.conf
 sed -i -r "s/server.koreaderSyncStrategyForward = \"*([a-zA-Z0-9_]+)\"*( #)?/server.koreaderSyncStrategyForward = ${KOREADER_SYNC_STRATEGY_FORWARD:-\1} #/" /home/suwayomi/.local/share/Tachidesk/server.conf