diff --git a/.circleci/config.yml b/.circleci/config.yml
index cba948d832..89ebfa1b6a 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -105,7 +105,7 @@ jobs:
 
   check-app-layers:
     docker:
-      - image: mattermost/mattermost-build-server:20200731_golang-1.14.6
+      - image: mattermost/mattermost-build-server:20201119_golang-1.15.5
     working_directory: ~/mattermost
     steps:
       - attach_workspace:
@@ -118,7 +118,7 @@ jobs:
 
   check-store-layers:
     docker:
-      - image: mattermost/mattermost-build-server:20200731_golang-1.14.6
+      - image: mattermost/mattermost-build-server:20201119_golang-1.15.5
     working_directory: ~/mattermost
     steps:
       - attach_workspace:
@@ -161,7 +161,7 @@ jobs:
 
   build:
     docker:
-      - image: mattermost/mattermost-build-server:20200731_golang-1.14.6
+      - image: mattermost/mattermost-build-server:20201119_golang-1.15.5
     resource_class: xlarge
     working_directory: ~/mattermost
     steps:
@@ -235,7 +235,7 @@ jobs:
               --env MM_SQLSETTINGS_DRIVERNAME=<<parameters.dbdriver>> \
               -v ~/mattermost:/mattermost \
               -w /mattermost/mattermost-server \
-              mattermost/mattermost-build-server:20200731_golang-1.14.6 \
+              mattermost/mattermost-build-server:20201119_golang-1.15.5 \
               bash -c "ulimit -n 8096; make test-server BUILD_NUMBER=$CIRCLE_BRANCH-$CIRCLE_PREVIOUS_BUILD_NUM TESTFLAGS= TESTFLAGSEE="
           no_output_timeout: 1h
       - run:
@@ -299,7 +299,7 @@ jobs:
               --env MM_SQLSETTINGS_DRIVERNAME=postgres \
               -v ~/mattermost:/mattermost \
               -w /mattermost/mattermost-server \
-              mattermost/mattermost-build-server:20200731_golang-1.14.6 \
+              mattermost/mattermost-build-server:20201119_golang-1.15.5 \
               bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='postgres://mmuser:mostest@postgres:5432/latest?sslmode=disable&connect_timeout=10' ARGS='version' run-cli"
 
             echo "Generating dump"
@@ -328,7 +328,7 @@ jobs:
               --env MM_SQLSETTINGS_DRIVERNAME=mysql \
               -v ~/mattermost:/mattermost \
               -w /mattermost/mattermost-server \
-              mattermost/mattermost-build-server:20200731_golang-1.14.6 \
+              mattermost/mattermost-build-server:20201119_golang-1.15.5 \
               bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='mmuser:mostest@tcp(mysql:3306)/latest?charset=utf8mb4,utf8&readTimeout=30s&writeTimeout=30s' ARGS='version' run-cli"
 
             echo "Ignoring known MySQL mismatch: ChannelMembers.SchemeGuest"
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index c9b2eea2a7..6753c4f307 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -33,7 +33,7 @@ empty:
 #    - if: '$ONLY_BUILD != "yes"'
 #
 #layers:
-#  image: $CI_REGISTRY/mattermost/ci/images/mattermost-build-server:20201023_golang-1.14.6
+#  image: $CI_REGISTRY/mattermost/ci/images/mattermost-build-server:20201119_golang-1.15.5
 #  stage: .pre
 #  script:
 #    - make store-layers
@@ -81,7 +81,7 @@ empty:
 #        --env MM_SQLSETTINGS_DRIVERNAME=postgres \
 #        -v $CI_PROJECT_DIR:/mattermost-server \
 #        -w /mattermost-server \
-#        mattermost/mattermost-build-server:20201023_golang-1.14.6 \
+#        mattermost/mattermost-build-server:20201119_golang-1.15.5 \
 #        bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='postgres://mmuser:mostest@postgres:5432/latest?sslmode=disable&connect_timeout=10' ARGS='version' run-cli"
 #    - docker logs -f server-postgres
 #    - echo "Generating dump"
@@ -110,7 +110,7 @@ empty:
 #        --env MM_SQLSETTINGS_DRIVERNAME=mysql \
 #        -v $CI_PROJECT_DIR:/mattermost-server \
 #        -w /mattermost-server \
-#        mattermost/mattermost-build-server:20201023_golang-1.14.6 \
+#        mattermost/mattermost-build-server:20201119_golang-1.15.5 \
 #        bash -c "ulimit -n 8096; make ARGS='version' run-cli && make MM_SQLSETTINGS_DATASOURCE='mmuser:mostest@tcp(mysql:3306)/latest?charset=utf8mb4,utf8&readTimeout=30s&writeTimeout=30s' ARGS='version' run-cli"
 #    - docker logs -f server-mysql
 #    - echo "Ignoring known MySQL mismatch 'ChannelMembers.SchemeGuest'"
diff --git a/.gitlab-ci/test.yml b/.gitlab-ci/test.yml
index e731bd6b6f..e68e50d210 100644
--- a/.gitlab-ci/test.yml
+++ b/.gitlab-ci/test.yml
@@ -34,7 +34,7 @@
         --env GOBIN=$PWD/bin \
         -v $CI_PROJECT_DIR:/mattermost-server \
         -w /mattermost-server \
-        mattermost/mattermost-build-server:20201023_golang-1.14.6 \
+        $CI_REGISTRY/mattermost/ci/images/mattermost-build-server:20201119_golang-1.15.5 \
         bash -c "ulimit -n 8096; make test-server BUILD_NUMBER=$CI_COMMIT_SHA TESTFLAGS= TESTFLAGSEE=;"
     - docker logs -f server
     - docker-compose logs --tail="all" -t --no-color > logs/docker-compose_logs
diff --git a/build/Jenkinsfile.branch b/build/Jenkinsfile.branch
index bb5467e23d..83f7be01c8 100644
--- a/build/Jenkinsfile.branch
+++ b/build/Jenkinsfile.branch
@@ -9,7 +9,7 @@ def platformStages = new org.mattermost.PlatformStages()
 
 def rndEE = UUID.randomUUID().toString()
 def rndTE = UUID.randomUUID().toString()
-def mmBuilderServer = 'mattermost/mattermost-build-server:20200731_golang-1.14.6'
+def mmBuilderServer = 'mattermost/mattermost-build-server:20201119_golang-1.15.5'
 def mmBuilderWebapp = 'mattermost/mattermost-build-webapp:oct-2-2018'
 
 pipeline {
diff --git a/build/README.md b/build/README.md
index 05b778a266..3fbf1b5828 100644
--- a/build/README.md
+++ b/build/README.md
@@ -16,4 +16,4 @@ In our Docker Hub Repository we have the following images:
 - `mattermost/mattermost-build-server:feb-28-2019` which is based on Go 1.12 you can use for MM versions >= `5.9.0` <= `5.15.0`
 - `mattermost/mattermost-build-server:sep-17-2019` which is based on Go 1.12.9 you can use for MM versions >= `5.16.0`
 - `mattermost/mattermost-build-server:20200322_golang-1.14.1` which is based on Go 1.14.1 you can use for MM versions >= `5.24.0`
-- `mattermost/mattermost-build-server:20200731_golang-1.14.6` which is based on Go 1.14.6 you can use for MM versions >= `5.26.0`
+- `mattermost/mattermost-build-server:20201119_golang-1.15.5` which is based on Go 1.14.6 you can use for MM versions >= `5.26.0`
diff --git a/build/local-test-env.sh b/build/local-test-env.sh
index bc7fceee60..66853225df 100755
--- a/build/local-test-env.sh
+++ b/build/local-test-env.sh
@@ -32,7 +32,7 @@ up()
         -e GOPATH="/go" \
         -e MM_SQLSETTINGS_DATASOURCE="postgres://mmuser:mostest@postgres:5432/mattermost_test?sslmode=disable&connect_timeout=10" \
         -e MM_SQLSETTINGS_DRIVERNAME=postgres
-        mattermost/mattermost-build-server:20200731_golang-1.14.6 bash
+        mattermost/mattermost-build-server:20201119_golang-1.15.5 bash
 }
 
 down()