diff --git a/.generator/Dockerfile b/.generator/Dockerfile
index 42043a02e62e..b80af6f7103a 100644
--- a/.generator/Dockerfile
+++ b/.generator/Dockerfile
@@ -48,7 +48,8 @@ ENV BAZELISK_VERSION=v1.26.0
 
 # Install multiple Python versions from source. `make altinstall` is used to
 # prevent replacing the system's default python binary.
-RUN for PYTHON_VERSION in 3.9.23 3.10.18 3.11.13 3.12.11 3.13.5; do \
+# TODO(http://github.com/googleapis/gapic-generator-python/issues/2435): Remove `3.10.18` when the linked issue is resolved.
+RUN for PYTHON_VERSION in 3.9.23 3.10.18 3.13.5; do \
     wget https://www.python.org/ftp/python/${PYTHON_VERSION}/Python-${PYTHON_VERSION}.tgz && \
     tar -xvf Python-${PYTHON_VERSION}.tgz && \
     cd Python-${PYTHON_VERSION} && \
@@ -60,8 +61,9 @@ RUN for PYTHON_VERSION in 3.9.23 3.10.18 3.11.13 3.12.11 3.13.5; do \
     ; done
 
 # Install pip for each python version
+# TODO(http://github.com/googleapis/gapic-generator-python/issues/2435): Remove `3.10` when the linked issue is resolved.
 RUN wget --no-check-certificate -O /tmp/get-pip.py 'https://bootstrap.pypa.io/get-pip.py' && \
-    for PYTHON_VERSION in 3.9 3.10 3.11 3.12 3.13; do \
+    for PYTHON_VERSION in 3.9 3.10 3.13; do \
         python${PYTHON_VERSION} /tmp/get-pip.py; \
     done && \
     rm /tmp/get-pip.py
@@ -142,15 +144,10 @@ RUN apt-get update && \
 COPY --from=builder /usr/local/bin/python3.9 /usr/local/bin/
 COPY --from=builder /usr/local/lib/python3.9 /usr/local/lib/python3.9
 
+# TODO(http://github.com/googleapis/gapic-generator-python/issues/2435): Remove `3.10` when the linked issue is resolved.
 COPY --from=builder /usr/local/bin/python3.10 /usr/local/bin/
 COPY --from=builder /usr/local/lib/python3.10 /usr/local/lib/python3.10
 
-COPY --from=builder /usr/local/bin/python3.11 /usr/local/bin/
-COPY --from=builder /usr/local/lib/python3.11 /usr/local/lib/python3.11
-
-COPY --from=builder /usr/local/bin/python3.12 /usr/local/bin/
-COPY --from=builder /usr/local/lib/python3.12 /usr/local/lib/python3.12
-
 COPY --from=builder /usr/local/bin/python3.13 /usr/local/bin/
 COPY --from=builder /usr/local/lib/python3.13 /usr/local/lib/python3.13
 
diff --git a/.generator/cli.py b/.generator/cli.py
index 458970183fdc..71ddaac80714 100644
--- a/.generator/cli.py
+++ b/.generator/cli.py
@@ -441,9 +441,6 @@ def handle_build(librarian: str = LIBRARIAN_DIR, repo: str = REPO_DIR):
     """The main coordinator for validating client library generation."""
     sessions = [
         "unit-3.9",
-        "unit-3.10",
-        "unit-3.11",
-        "unit-3.12",
         "unit-3.13",
         "docs",
         "system-3.13",