diff --git a/session_ml/SingleCell/Dockerfile b/session_ml/SingleCell/Dockerfile
index c695f89..0ef896f 100644
--- a/session_ml/SingleCell/Dockerfile
+++ b/session_ml/SingleCell/Dockerfile
@@ -23,7 +23,7 @@ RUN export DEBIAN_FRONTEND=noninteractive \
       libclang-dev \
       locales \
       ca-certificates \
-      libxml2 \ 
+      libxml2 \
       libodbc1 \
       libglpk-dev \
       libssl-dev \
@@ -57,14 +57,14 @@ RUN conda env update -n base -f /tmp/SingleCell_env.yml
 # Clean up Conda cache to reduce image size
 RUN conda clean -afy
 
-# Install R
+# Install R 4.4.x from the Jammy repository
 RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys E298A3A825C0D65DFD57CBB651716619E084DAB9 \
-    && echo 'deb https://cloud.r-project.org/bin/linux/ubuntu focal-cran40/' >> /etc/apt/sources.list \
+    && echo "deb https://cloud.r-project.org/bin/linux/ubuntu jammy-cran40/" >> /etc/apt/sources.list \
     && apt-get -yq update \
     && apt-get -yq install --no-install-recommends \
     r-base \
     && apt-get clean \
-    && rm -rf /var/lib/apt/lists/* \ 
+    && rm -rf /var/lib/apt/lists/* \
     && apt-get autoremove -yq && apt-get autoclean -yq
 
 # Install necessary libraries for GLIBCXX_3.4.29
diff --git a/session_ml/SingleCell/SingleCell_env.yml b/session_ml/SingleCell/SingleCell_env.yml
index c8ef102..3ae1d9d 100644
--- a/session_ml/SingleCell/SingleCell_env.yml
+++ b/session_ml/SingleCell/SingleCell_env.yml
@@ -15,5 +15,5 @@ dependencies:
   - r-signac
   - r-cowplot
   - r-hdf5r
-  - r-matrix
-  
\ No newline at end of file
+  - r-matrix=1.7-0  
+  - r-irlba
\ No newline at end of file