diff --git a/.gradle/7.1/dependencies-accessors/dependencies-accessors.lock b/.gradle/7.1/dependencies-accessors/dependencies-accessors.lock
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deleted file mode 100644
index e69de29bb..000000000
diff --git a/.gradle/7.1/executionHistory/executionHistory.bin b/.gradle/7.1/executionHistory/executionHistory.bin
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diff --git a/.gradle/7.1/fileChanges/last-build.bin b/.gradle/7.1/fileChanges/last-build.bin
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diff --git a/.gradle/7.1/fileHashes/fileHashes.bin b/.gradle/7.1/fileHashes/fileHashes.bin
deleted file mode 100644
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diff --git a/.gradle/7.1/fileHashes/fileHashes.lock b/.gradle/7.1/fileHashes/fileHashes.lock
deleted file mode 100644
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diff --git a/.gradle/7.1/fileHashes/resourceHashesCache.bin b/.gradle/7.1/fileHashes/resourceHashesCache.bin
deleted file mode 100644
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diff --git a/.gradle/7.1/gc.properties b/.gradle/7.1/gc.properties
deleted file mode 100644
index e69de29bb..000000000
diff --git a/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/.gradle/buildOutputCleanup/buildOutputCleanup.lock
index 9bad555d9..49e473b32 100644
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diff --git a/.gradle/buildOutputCleanup/cache.properties b/.gradle/buildOutputCleanup/cache.properties
index 3b26829ac..011fcf12f 100644
--- a/.gradle/buildOutputCleanup/cache.properties
+++ b/.gradle/buildOutputCleanup/cache.properties
@@ -1,2 +1,2 @@
-#Wed Jul 14 11:41:31 CEST 2021
-gradle.version=7.1
+#Sun Oct 24 18:44:30 CEST 2021
+gradle.version=6.9
diff --git a/.gradle/buildOutputCleanup/outputFiles.bin b/.gradle/buildOutputCleanup/outputFiles.bin
index 4b78a34e2..a6e0a8421 100644
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diff --git a/.gradle/checksums/checksums.lock b/.gradle/checksums/checksums.lock
index b85dae70a..ff3a6a57c 100644
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diff --git a/.gradle/checksums/md5-checksums.bin b/.gradle/checksums/md5-checksums.bin
index 40ee77082..5ab11057d 100644
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diff --git a/.gradle/checksums/sha1-checksums.bin b/.gradle/checksums/sha1-checksums.bin
index 7185a45dd..5057acaaa 100644
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diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 7454180f2..e708b1c02 100644
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diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 69a971507..549d84424 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.9-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 744e882ed..4f906e0c8 100755
--- a/gradlew
+++ b/gradlew
@@ -72,7 +72,7 @@ case "`uname`" in
   Darwin* )
     darwin=true
     ;;
-  MSYS* | MINGW* )
+  MINGW* )
     msys=true
     ;;
   NONSTOP* )