diff --git a/Dockerfile b/Dockerfile
index cc9ec311be5..a063f2e10a1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -24,7 +24,7 @@ RUN addgroup \
     -u 1000 \
     -G git \
     git && \
-  echo "git:$(date +%s | sha256sum | base64 | head -c 32)" | chpasswd
+  echo "git:$(dd if=/dev/urandom bs=24 count=1 status=none | base64)" | chpasswd
 
 ENV USER git
 ENV GITEA_CUSTOM /data/gitea
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index 9f91ae90b63..a9dc3adc19e 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -23,7 +23,7 @@ RUN addgroup \
     -u 1000 \
     -G git \
     git && \
-  echo "git:$(date +%s | sha256sum | base64 | head -c 32)" | chpasswd
+  echo "git:$(dd if=/dev/urandom bs=24 count=1 status=none | base64)" | chpasswd
 
 ENV USER git
 ENV GITEA_CUSTOM /data/gitea
diff --git a/Dockerfile.rpi b/Dockerfile.rpi
index 8ecfd19a1e5..373b8025af9 100644
--- a/Dockerfile.rpi
+++ b/Dockerfile.rpi
@@ -24,7 +24,7 @@ RUN addgroup \
     -u 1000 \
     -G git \
     git && \
-  echo "git:$(date +%s | sha256sum | base64 | head -c 32)" | chpasswd
+  echo "git:$(dd if=/dev/urandom bs=24 count=1 status=none | base64)" | chpasswd
 
 ENV USER git
 ENV GITEA_CUSTOM /data/gitea