diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 53b9e380..f371643e 100755
--- 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-6.9.4-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.0-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gretl/build.gradle b/gretl/build.gradle
index 6a490ba6..c174f5b7 100755
--- a/gretl/build.gradle
+++ b/gretl/build.gradle
@@ -284,3 +284,9 @@ processResources{
     duplicatesStrategy = DuplicatesStrategy.INCLUDE
 }
 
+// init_postgresql.sql seems to be copied multiple times.
+// Starting with 7.0.0 there is no default strategy anymore. So it has to be explicitly set.
+processIntegrationTestResources {
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+}
+
diff --git a/runtimeImage/gretl/Dockerfile b/runtimeImage/gretl/Dockerfile
index d5fde0be..80054989 100755
--- a/runtimeImage/gretl/Dockerfile
+++ b/runtimeImage/gretl/Dockerfile
@@ -18,8 +18,8 @@ RUN apk add --no-cache bash ca-certificates java-cacerts curl \
 
 ENV JAVA_TOOL_OPTIONS=-Duser.home=${HOME}
 ENV GRADLE_HOME /opt/gradle
-ENV GRADLE_VERSION 6.9.4
-ARG GRADLE_DOWNLOAD_SHA256=3e240228538de9f18772a574e99a0ba959e83d6ef351014381acd9631781389a
+ENV GRADLE_VERSION 7.0
+ARG GRADLE_DOWNLOAD_SHA256=eb8b89184261025b0430f5b2233701ff1377f96da1ef5e278af6ae8bac5cc305
 RUN set -o errexit -o nounset \
     && echo "Downloading Gradle" \
     && wget --no-verbose --output-document=gradle.zip "https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip" \