diff --git a/notebooks/htc-datascience-notebook/Dockerfile b/notebooks/htc-datascience-notebook/Dockerfile
index 9310860..72c69f8 100644
--- a/notebooks/htc-datascience-notebook/Dockerfile
+++ b/notebooks/htc-datascience-notebook/Dockerfile
@@ -83,8 +83,8 @@ RUN mkdir -p /usr/libexec \
 # create the sssd user and group with explicit IDs rather than allowing
 # packages to select arbitrary IDs.
 
-RUN groupadd -r -g 996 sssd \
-    && useradd -r -g sssd -u 996 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
+RUN groupadd -r -g 990 sssd \
+    && useradd -r -g sssd -u 990 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
     #
     && apt-get update \
     && apt-get install -y sssd \
diff --git a/notebooks/htc-minimal-notebook/Dockerfile b/notebooks/htc-minimal-notebook/Dockerfile
index be00b40..23adb8c 100644
--- a/notebooks/htc-minimal-notebook/Dockerfile
+++ b/notebooks/htc-minimal-notebook/Dockerfile
@@ -83,8 +83,8 @@ RUN mkdir -p /usr/libexec \
 # create the sssd user and group with explicit IDs rather than allowing
 # packages to select arbitrary IDs.
 
-RUN groupadd -r -g 996 sssd \
-    && useradd -r -g sssd -u 996 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
+RUN groupadd -r -g 990 sssd \
+    && useradd -r -g sssd -u 990 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
     #
     && apt-get update \
     && apt-get install -y sssd \
diff --git a/notebooks/htc-pytorch-notebook/Dockerfile b/notebooks/htc-pytorch-notebook/Dockerfile
index bd3bd91..128e7e1 100644
--- a/notebooks/htc-pytorch-notebook/Dockerfile
+++ b/notebooks/htc-pytorch-notebook/Dockerfile
@@ -83,8 +83,8 @@ RUN mkdir -p /usr/libexec \
 # create the sssd user and group with explicit IDs rather than allowing
 # packages to select arbitrary IDs.
 
-RUN groupadd -r -g 996 sssd \
-    && useradd -r -g sssd -u 996 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
+RUN groupadd -r -g 990 sssd \
+    && useradd -r -g sssd -u 990 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
     #
     && apt-get update \
     && apt-get install -y sssd \
diff --git a/notebooks/htc-tensorflow-notebook/Dockerfile b/notebooks/htc-tensorflow-notebook/Dockerfile
index 8a7b124..5c3f50d 100644
--- a/notebooks/htc-tensorflow-notebook/Dockerfile
+++ b/notebooks/htc-tensorflow-notebook/Dockerfile
@@ -83,8 +83,8 @@ RUN mkdir -p /usr/libexec \
 # create the sssd user and group with explicit IDs rather than allowing
 # packages to select arbitrary IDs.
 
-RUN groupadd -r -g 996 sssd \
-    && useradd -r -g sssd -u 996 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
+RUN groupadd -r -g 990 sssd \
+    && useradd -r -g sssd -u 990 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
     #
     && apt-get update \
     && apt-get install -y sssd \
diff --git a/template/Dockerfile b/template/Dockerfile
index 53af7ac..ce96342 100644
--- a/template/Dockerfile
+++ b/template/Dockerfile
@@ -83,8 +83,8 @@ RUN mkdir -p /usr/libexec \
 # create the sssd user and group with explicit IDs rather than allowing
 # packages to select arbitrary IDs.
 
-RUN groupadd -r -g 996 sssd \
-    && useradd -r -g sssd -u 996 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
+RUN groupadd -r -g 990 sssd \
+    && useradd -r -g sssd -u 990 -d / -s /usr/sbin/nologin -c "System user for sssd" sssd \
     #
     && apt-get update \
     && apt-get install -y sssd \