diff --git a/.devcontainer/Dockerfile b/.devcontainer/Dockerfile
index 4d2ea23..2016a95 100644
--- a/.devcontainer/Dockerfile
+++ b/.devcontainer/Dockerfile
@@ -20,8 +20,8 @@ RUN mkdir -p /opt/oracle
 WORKDIR /tmp
 RUN ARCH=$(uname -m) && \
     if [ "$ARCH" = "aarch64" ] || [ "$ARCH" = "arm64" ]; then \
-        IC_VERSION="23.26.1.0.0"; \
-        IC_PATH="2326100"; \
+        IC_VERSION="23.26.3.0.0"; \
+        IC_PATH="2326300"; \
         BASE_URL="https://download.oracle.com/otn_software/linux/instantclient/${IC_PATH}"; \
         BASIC="instantclient-basic-linux.arm64-${IC_VERSION}.zip"; \
         SDK="instantclient-sdk-linux.arm64-${IC_VERSION}.zip"; \
diff --git a/.github/workflows/test_11g.yml b/.github/workflows/test_11g.yml
index 72d5108..f0a639f 100644
--- a/.github/workflows/test_11g.yml
+++ b/.github/workflows/test_11g.yml
@@ -22,8 +22,8 @@ jobs:
           'jruby-10.1.1.0',
         ]
     env:
-      ORACLE_HOME: /opt/oracle/instantclient_21_21
-      LD_LIBRARY_PATH: /opt/oracle/instantclient_21_21
+      ORACLE_HOME: /opt/oracle/instantclient_21_23
+      LD_LIBRARY_PATH: /opt/oracle/instantclient_21_23
       NLS_LANG: AMERICAN_AMERICA.AL32UTF8
       TNS_ADMIN: ./ci/network/admin
       DATABASE_NAME: XE
@@ -62,20 +62,20 @@ jobs:
         sudo ln -s /usr/lib/x86_64-linux-gnu/libaio.so.1t64 /usr/lib/x86_64-linux-gnu/libaio.so.1
     - name: Download Oracle instant client
       run: |
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-basic-linux.x64-21.21.0.0.0dbru.zip
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-sqlplus-linux.x64-21.21.0.0.0dbru.zip
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-sdk-linux.x64-21.21.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-basic-linux.x64-21.23.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-sqlplus-linux.x64-21.23.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-sdk-linux.x64-21.23.0.0.0dbru.zip
     - name: Install Oracle instant client
       run: |
         sudo mkdir -p /opt/oracle/
-        sudo unzip -q instantclient-basic-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        sudo unzip -qo instantclient-sqlplus-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        sudo unzip -qo instantclient-sdk-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        echo "/opt/oracle/instantclient_21_21" >> $GITHUB_PATH
+        sudo unzip -q instantclient-basic-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -qo instantclient-sqlplus-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -qo instantclient-sdk-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        echo "/opt/oracle/instantclient_21_23" >> $GITHUB_PATH
     - name: Install JDBC Driver
       if: startsWith(matrix.ruby, 'jruby')
       run: |
-        wget -q https://download.oracle.com/otn-pub/otn_software/jdbc/23261/ojdbc17.jar -O ./lib/ojdbc17.jar
+        wget -q https://download.oracle.com/otn-pub/otn_software/jdbc/23263/ojdbc17.jar -O ./lib/ojdbc17.jar
     - name: Configure ORA_TZFILE to match Oracle 11g server
       run: |
         # Oracle 11g XE uses timezone file v14; the 21.x Instant Client
diff --git a/.github/workflows/test_11g_ojdbc11.yml b/.github/workflows/test_11g_ojdbc11.yml
index 235ece3..d2c3584 100644
--- a/.github/workflows/test_11g_ojdbc11.yml
+++ b/.github/workflows/test_11g_ojdbc11.yml
@@ -19,8 +19,8 @@ jobs:
           'jruby-10.1.1.0'
         ]
     env:
-      ORACLE_HOME: /opt/oracle/instantclient_21_21
-      LD_LIBRARY_PATH: /opt/oracle/instantclient_21_21
+      ORACLE_HOME: /opt/oracle/instantclient_21_23
+      LD_LIBRARY_PATH: /opt/oracle/instantclient_21_23
       NLS_LANG: AMERICAN_AMERICA.AL32UTF8
       TNS_ADMIN: ./ci/network/admin
       DATABASE_NAME: XE
@@ -58,16 +58,16 @@ jobs:
         sudo ln -s /usr/lib/x86_64-linux-gnu/libaio.so.1t64 /usr/lib/x86_64-linux-gnu/libaio.so.1
     - name: Download Oracle instant client
       run: |
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-basic-linux.x64-21.21.0.0.0dbru.zip
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-sqlplus-linux.x64-21.21.0.0.0dbru.zip
-        wget -q https://download.oracle.com/otn_software/linux/instantclient/2121000/instantclient-sdk-linux.x64-21.21.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-basic-linux.x64-21.23.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-sqlplus-linux.x64-21.23.0.0.0dbru.zip
+        wget -q https://download.oracle.com/otn_software/linux/instantclient/2123000/instantclient-sdk-linux.x64-21.23.0.0.0dbru.zip
     - name: Install Oracle instant client
       run: |
         sudo mkdir -p /opt/oracle/
-        sudo unzip -q instantclient-basic-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        sudo unzip -qo instantclient-sqlplus-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        sudo unzip -qo instantclient-sdk-linux.x64-21.21.0.0.0dbru.zip -d /opt/oracle
-        echo "/opt/oracle/instantclient_21_21" >> $GITHUB_PATH
+        sudo unzip -q instantclient-basic-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -qo instantclient-sqlplus-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        sudo unzip -qo instantclient-sdk-linux.x64-21.23.0.0.0dbru.zip -d /opt/oracle
+        echo "/opt/oracle/instantclient_21_23" >> $GITHUB_PATH
     - name: Install JDBC Driver
       run: |
         cp "$ORACLE_HOME/ojdbc11.jar" ./lib/ojdbc11.jar