diff --git a/.travis.yml b/.travis.yml
index 34ab49c7393..471a4bef9c7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -135,13 +135,13 @@ script:
   - /bin/bash ./bin/utils/detect_tab_in_java_class.sh
   # run integration tests defined in maven pom.xml
   # WARN: Travis will timeout after 10 minutes of no stdout/stderr activity, which is problematic with mvn --quiet.
-  - mvn --quiet --batch-mode --show-version clean install -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-  - mvn --quiet --batch-mode --show-version verify -Psamples -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet --batch-mode --show-version clean install -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet --batch-mode --show-version verify -Psamples -Dorg.slf4j.simpleLogger.defaultLogLevel=error
   # test maven plugin
-  - mvn --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/java-client.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-  - mvn --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/multi-module/pom.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-  - mvn --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/kotlin.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-  - mvn --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/spring.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/java-client.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/multi-module/pom.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/kotlin.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet clean compile -f modules/openapi-generator-maven-plugin/examples/spring.xml -Dorg.slf4j.simpleLogger.defaultLogLevel=error
   # test gradle plugin
   - (cd modules/openapi-generator-gradle-plugin/samples/local-spec && ./gradlew buildGoSdk)
   - (cd modules/openapi-generator-gradle-plugin/samples/local-spec && ./gradlew openApiGenerate)
diff --git a/CI/.travis.yml.bash b/CI/.travis.yml.bash
index f224cac3958..a618399ff85 100644
--- a/CI/.travis.yml.bash
+++ b/CI/.travis.yml.bash
@@ -34,4 +34,4 @@ script:
   - set -e
   # run integration tests defined in maven pom.xml
   - cp pom.xml.bash pom.xml
-  - mvn --batch-mode verify -Psamples
+  - mvn --no-snapshot-updates --batch-mode verify -Psamples
diff --git a/CI/.travis.yml.ios b/CI/.travis.yml.ios
index 8da2e0768d6..31e0df63926 100644
--- a/CI/.travis.yml.ios
+++ b/CI/.travis.yml.ios
@@ -34,4 +34,4 @@ before_install:
 
 script:
   # run integration tests defined in maven pom.xml
-  - mvn -q --batch-mode verify -Psamples.ios -Dmaven.javadoc.skip=true
+  - mvn --no-snapshot-updates -q --batch-mode verify -Psamples.ios -Dmaven.javadoc.skip=true
diff --git a/CI/bitrise.yml b/CI/bitrise.yml
index 83156c662a4..de1bf901f26 100644
--- a/CI/bitrise.yml
+++ b/CI/bitrise.yml
@@ -28,7 +28,7 @@ workflows:
 
             set -e
 
-            mvn package -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+            mvn --no-snapshot-updates package -Dorg.slf4j.simpleLogger.defaultLogLevel=error
         title: Build openapi-generator
     - script@1.1.5:
         title: Update Swift samples
diff --git a/CI/circle_parallel.sh b/CI/circle_parallel.sh
index d5efb638149..3b9bb976085 100755
--- a/CI/circle_parallel.sh
+++ b/CI/circle_parallel.sh
@@ -24,8 +24,8 @@ if [ "$NODE_INDEX" = "1" ]; then
   export PATH="/usr/local/go1.14/go/bin:$PATH"
   go version
 
-  mvn --quiet verify -Psamples.circleci -Dorg.slf4j.simpleLogger.defaultLogLevel=error
-  mvn --quiet javadoc:javadoc -Psamples.circleci -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  mvn --no-snapshot-updates --quiet verify -Psamples.circleci -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  mvn --no-snapshot-updates --quiet javadoc:javadoc -Psamples.circleci -Dorg.slf4j.simpleLogger.defaultLogLevel=error
 
 elif [ "$NODE_INDEX" = "2" ]; then
   # run ensure-up-to-date sample script on SNAPSHOT version only
@@ -58,7 +58,7 @@ elif [ "$NODE_INDEX" = "2" ]; then
   sudo apt-get -y install libcurl4-gnutls-dev
 
   # run integration tests
-  mvn --quiet verify -Psamples.misc -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  mvn --no-snapshot-updates --quiet verify -Psamples.misc -Dorg.slf4j.simpleLogger.defaultLogLevel=error
 else
   echo "Running node $NODE_INDEX to test 'samples.circleci.jdk7' defined in pom.xml ..."
   sudo update-java-alternatives -s java-1.7.0-openjdk-amd64
@@ -73,7 +73,7 @@ else
   sudo apt-get install dart
   export PATH="$PATH:/usr/lib/dart/bin"
 
-  mvn --quiet verify -Psamples.circleci.jdk7 -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  mvn --no-snapshot-updates --quiet verify -Psamples.circleci.jdk7 -Dorg.slf4j.simpleLogger.defaultLogLevel=error
 fi
 
 
diff --git a/appveyor.yml b/appveyor.yml
index 008ac171f88..6cd7a9128cf 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -48,7 +48,7 @@ build_script:
   - nuget restore samples\client\petstore\csharp\OpenAPIClientNetStandard\Org.OpenAPITools.sln
   - msbuild samples\client\petstore\csharp\OpenAPIClientNetStandard\Org.OpenAPITools.sln /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
   # install openapi-generator locally
-  - mvn clean install --quiet -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+  - mvn --no-snapshot-updates --quiet clean install -Dorg.slf4j.simpleLogger.defaultLogLevel=error
   # run the locally installed openapi-generator-gradle-plugin
   - gradle -b modules\openapi-generator-gradle-plugin\samples\local-spec\build.gradle buildGoSdk --info
 test_script:
diff --git a/bin/utils/ensure-up-to-date b/bin/utils/ensure-up-to-date
index 7d5d10f075c..ea74226e31f 100755
--- a/bin/utils/ensure-up-to-date
+++ b/bin/utils/ensure-up-to-date
@@ -100,7 +100,7 @@ declare -a always_iterate=(
 export JAVA_OPTS="${JAVA_OPTS} -Djava.awt.headless=true -Dorg.slf4j.simpleLogger.defaultLogLevel=warn"
 if [ "true" = "$batch_mode" ]; then
   if [ ! -f "$executable" ]; then
-    (cd "${root}" && mvn -B clean package -DskipTests=true -Dmaven.javadoc.skip=true)
+    (cd "${root}" && mvn -B --no-snapshot-updates clean package -DskipTests=true -Dmaven.javadoc.skip=true)
   fi
 
   # shellcheck disable=SC2086
diff --git a/circle.yml b/circle.yml
index 06b9373f3f3..04eb415803b 100644
--- a/circle.yml
+++ b/circle.yml
@@ -66,7 +66,7 @@ jobs:
     - run: sleep 30
     - run: cat /etc/hosts
     # Test
-    - run: mvn --quiet clean install -Dorg.slf4j.simpleLogger.defaultLogLevel=error
+    - run: mvn --no-snapshot-updates --quiet clean install -Dorg.slf4j.simpleLogger.defaultLogLevel=error
     - run: ./CI/circle_parallel.sh 
     # Save dependency cache
     - save_cache:
diff --git a/pom.xml b/pom.xml
index 1ffcbe0f153..30e17e51e64 100644
--- a/pom.xml
+++ b/pom.xml
@@ -227,6 +227,7 @@
                     <argLine>@{argLine} -XX:+StartAttachListener</argLine>
                     <systemPropertyVariables>
                         <org.openapitools.codegen.utils.oncelogger.expiry>1000</org.openapitools.codegen.utils.oncelogger.expiry>
+                        <org.openapitools.codegen.utils.oncelogger.cachesize>5000</org.openapitools.codegen.utils.oncelogger.cachesize>
                     </systemPropertyVariables>
                 </configuration>
                 <dependencies>
diff --git a/shippable.yml b/shippable.yml
index d2b96f13632..c1bd579106a 100644
--- a/shippable.yml
+++ b/shippable.yml
@@ -15,7 +15,7 @@ build:
     - rm /etc/apt/sources.list.d/jonathonf-ubuntu-backports-xenial.list 
     # 
     - java -version
-    - mvn --quiet clean install -Dmaven.javadoc.skip=true
+    - mvn --no-snapshot-updates --quiet clean install -Dmaven.javadoc.skip=true
     # ensure all modifications created by 'mature' generators are in the git repo
     # below move to CircleCI ./bin/utils/ensure-up-to-date
     # prepare environment for tests
@@ -42,7 +42,7 @@ build:
     - elixir --version
     - mix --version
     # test samples defined in pom.xml
-    - mvn --quiet verify -P samples.shippable -Dmaven.javadoc.skip=true
+    - mvn --no-snapshot-updates --quiet verify -P samples.shippable -Dmaven.javadoc.skip=true
     # below moved to CircleCI
     ## generate all petstore samples (client, servers, doc)
     #- ./bin/run-all-petstore