diff --git a/Dockerfile b/Dockerfile
index 5d7352d..6250662 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -53,7 +53,7 @@ RUN \
   cd /app/www && \
   yarn install && \
   gem install foreman && \
-  sed -i 's/3.3.1/3.3.3/' .ruby-version && \
+  sed -i 's/\d.\d.\d/3.3.3/' .ruby-version && \
   bundle config set --local deployment 'true' && \
   bundle config set --local without 'development test' && \
   bundle config force_ruby_platform true && \
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 46ee6b1..50bb0a2 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -53,7 +53,7 @@ RUN \
   cd /app/www && \
   yarn install && \
   gem install foreman && \
-  sed -i 's/3.3.1/3.3.3/' .ruby-version && \
+  sed -i 's/\d.\d.\d/3.3.3/' .ruby-version && \
   bundle config set --local deployment 'true' && \
   bundle config set --local without 'development test' && \
   bundle config force_ruby_platform true && \