diff --git a/.ci/jenkins/Jenkinsfile.deploy b/.ci/jenkins/Jenkinsfile.deploy
index 68836264acf..3dbcda10a72 100644
--- a/.ci/jenkins/Jenkinsfile.deploy
+++ b/.ci/jenkins/Jenkinsfile.deploy
@@ -561,14 +561,6 @@ void pushOperatorTemporaryImage() {
     imageUtils.pushImage(temporaryImageFullName)
 }
 
-boolean isStream8() {
-    return env.OPTAPLANNER_LATEST_STREAM == '8'
-}
-
-boolean isStream9() {
-    return env.OPTAPLANNER_LATEST_STREAM == '9'
-}
-
 boolean isDeployDisabled() {
     return env.DISABLE_DEPLOY.toBoolean()
 }
diff --git a/.ci/jenkins/Jenkinsfile.setup-branch b/.ci/jenkins/Jenkinsfile.setup-branch
index bf22254755d..1c0493b6d08 100644
--- a/.ci/jenkins/Jenkinsfile.setup-branch
+++ b/.ci/jenkins/Jenkinsfile.setup-branch
@@ -74,8 +74,7 @@ pipeline {
 
         stage('Update Optaplanner version in kie-benchmarks') {
             when {
-                // TODO to change once Optaplanner is totally migrated to Quarkus 3
-                expression { isStream8() && isMainBranch() }
+                expression { isMainBranch() }
             }
             steps {
                 script {
@@ -158,13 +157,4 @@ void mergeAndPush(String prLink, String targetBranch) {
         githubscm.mergePR(prLink, getGitAuthorCredsId())
         githubscm.pushObject('origin', targetBranch, getGitAuthorPushCredsId())
     }
-}
-
-boolean isStream8() {
-    return env.OPTAPLANNER_LATEST_STREAM == '8'
-}
-
-boolean isStream9() {
-    return env.OPTAPLANNER_LATEST_STREAM == '9'
-}
-
+}
\ No newline at end of file
diff --git a/.ci/jenkins/config/branch.yaml b/.ci/jenkins/config/branch.yaml
index 145f634c961..7bc6888e810 100644
--- a/.ci/jenkins/config/branch.yaml
+++ b/.ci/jenkins/config/branch.yaml
@@ -1,3 +1,5 @@
+generation_config:
+  missing_environment: ignore
 environments:
   native:
     env_vars:
@@ -6,17 +8,6 @@ environments:
       ADDITIONAL_TIMEOUT: 720
     ids:
     - native
-  quarkus-main:
-    enabled: false
-    env_vars:
-      QUARKUS_BRANCH: main
-    ids:
-    - quarkus
-  quarkus-branch:
-    env_vars:
-      QUARKUS_BRANCH: '2.16'
-    ids:
-    - quarkus
   ecosystem:
     auto_generation: false
     ids:
@@ -85,5 +76,5 @@ jenkins:
         args: --privileged --group-add docker
   default_tools:
     jdk: jdk_17_latest
-    maven: maven_3.8.6
+    maven: maven_3.9.3
     sonar_jdk: jdk_17_latest
diff --git a/.ci/jenkins/config/main.yaml b/.ci/jenkins/config/main.yaml
index e1786b88f71..6180bd10cc3 100644
--- a/.ci/jenkins/config/main.yaml
+++ b/.ci/jenkins/config/main.yaml
@@ -13,9 +13,6 @@ git:
   branches:
   - name: main
     main_branch: true
-  - name: 8.45.x
-    seed:
-      branch: seed-optaplanner-8.45.x
 seed:
   config_file:
     git:
diff --git a/.ci/jenkins/dsl/jobs.groovy b/.ci/jenkins/dsl/jobs.groovy
index d6e9285ee90..c4f1385a9f6 100644
--- a/.ci/jenkins/dsl/jobs.groovy
+++ b/.ci/jenkins/dsl/jobs.groovy
@@ -53,7 +53,7 @@ setupProjectNightlyJob()
 setupProjectReleaseJob()
 setupProjectPostReleaseJob()
 
-if (Utils.isMainBranch(this) && isStream8()) { // When there is Drools 9, we may enable the job for 9.x
+if (Utils.isMainBranch(this)) {
     setupProjectDroolsJob('main')
 }
 
@@ -93,7 +93,7 @@ void createProjectSetupBranchJob() {
         GIT_AUTHOR: "${GIT_AUTHOR_NAME}",
 
         IS_MAIN_BRANCH: "${Utils.isMainBranch(this)}",
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -115,7 +115,7 @@ void setupProjectNightlyJob() {
 
         MAVEN_SETTINGS_CONFIG_FILE_ID: "${MAVEN_SETTINGS_FILE_ID}",
         ARTIFACTS_REPOSITORY: "${MAVEN_ARTIFACTS_REPOSITORY}",
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -134,7 +134,7 @@ void setupProjectReleaseJob() {
 
         DEFAULT_STAGING_REPOSITORY: "${MAVEN_NEXUS_STAGING_PROFILE_URL}",
         ARTIFACTS_REPOSITORY: "${MAVEN_ARTIFACTS_REPOSITORY}",
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -165,7 +165,7 @@ void setupProjectPostReleaseJob() {
         MAVEN_DEPENDENCIES_REPOSITORY: "${MAVEN_ARTIFACTS_REPOSITORY}",
 
         GITHUB_CLI_VERSION: '0.11.1',
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -222,10 +222,6 @@ createSetupBranchJob()
 // Nightly jobs
 setupDeployJob(JobType.NIGHTLY)
 setupSpecificBuildChainNightlyJob('native')
-setupSpecificBuildChainNightlyJob('quarkus-main')
-setupSpecificBuildChainNightlyJob('quarkus-branch')
-setupSpecificBuildChainNightlyJob('quarkus-lts')
-setupSpecificBuildChainNightlyJob('native-lts')
 
 // Release jobs
 setupDeployJob(JobType.RELEASE)
@@ -265,7 +261,7 @@ void createSetupBranchJob() {
         MAVEN_SETTINGS_CONFIG_FILE_ID: "${MAVEN_SETTINGS_FILE_ID}",
 
         IS_MAIN_BRANCH: "${Utils.isMainBranch(this)}",
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -293,7 +289,7 @@ void setupDeployJob(JobType jobType, String envName = '') {
 
         JENKINS_EMAIL_CREDS_ID: "${JENKINS_EMAIL_CREDS_ID}",
         MAVEN_SETTINGS_CONFIG_FILE_ID: "${MAVEN_SETTINGS_FILE_ID}",
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream(),
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}",
         DISABLE_DEPLOY: Utils.isDeployDisabled(this),
     ])
     if (jobType == JobType.PULL_REQUEST) {
@@ -378,7 +374,7 @@ void setupPromoteJob(JobType jobType) {
 
         PROPERTIES_FILE_NAME: 'deployment.properties',
         GITHUB_CLI_VERSION: '0.11.1',
-        OPTAPLANNER_LATEST_STREAM: getOptaPlannerLatestStream()
+        OPTAPLANNER_LATEST_STREAM: "${GIT_MAIN_BRANCH}"
     ])
     KogitoJobTemplate.createPipelineJob(this, jobParams)?.with {
         parameters {
@@ -420,19 +416,3 @@ void setupOptaPlannerTurtleTestsJob(String constraintStreamImplType) {
         }
     }
 }
-
-String getOptaPlannerLatestStream() {
-    String gitMainBranch = "${GIT_MAIN_BRANCH}"
-
-    if (gitMainBranch == 'main') {
-        return '8'
-    } else if (gitMainBranch == '9.x') {
-        return '9'
-    } else {
-        return gitMainBranch
-    }
-}
-
-boolean isStream8() {
-    return getOptaPlannerLatestStream() == '8'
-}
diff --git a/.ci/jenkins/project/Jenkinsfile.post-release b/.ci/jenkins/project/Jenkinsfile.post-release
index 01cb7e4caf3..08b6eec9ce0 100644
--- a/.ci/jenkins/project/Jenkinsfile.post-release
+++ b/.ci/jenkins/project/Jenkinsfile.post-release
@@ -280,12 +280,4 @@ def forcePushBranch(String branch) {
             git push origin ${branch} --force
         """
     }
-}
-
-boolean isStream8() {
-    return env.OPTAPLANNER_LATEST_STREAM == '8'
-}
-
-boolean isStream9() {
-    return env.OPTAPLANNER_LATEST_STREAM == '9'
-}
+}
\ No newline at end of file
diff --git a/.ci/jenkins/project/Jenkinsfile.setup-branch b/.ci/jenkins/project/Jenkinsfile.setup-branch
index 11d417b8350..f54d7f3ba5f 100644
--- a/.ci/jenkins/project/Jenkinsfile.setup-branch
+++ b/.ci/jenkins/project/Jenkinsfile.setup-branch
@@ -195,12 +195,4 @@ String getVersionFromReleaseBranch(String releaseBranch, int microVersion = 0, S
     } else {
         error 'Cannot parse given branch as a release branch, aka [M].[m].x ...'
         }
-}
-
-boolean isStream8() {
-    return env.OPTAPLANNER_LATEST_STREAM == '8'
-}
-
-boolean isStream9() {
-    return env.OPTAPLANNER_LATEST_STREAM == '9'
-}
+}
\ No newline at end of file