diff --git a/ch06/02_bonus_additional-experiments/README.md b/ch06/02_bonus_additional-experiments/README.md
index 27967df..d0424e0 100644
--- a/ch06/02_bonus_additional-experiments/README.md
+++ b/ch06/02_bonus_additional-experiments/README.md
@@ -19,7 +19,7 @@ For example,
 | 6    | gpt2-medium (355M) | pretrained | last                     | last_block       | longest train ex. (120)                                | 87.50%       | 91.28%         | 84.67%   | 0.75 min      | A100    |
 | 7    | gpt2-large (774M)  | pretrained | last                     | last_block       | longest train ex. (120)                                | 99.52%       | 98.66%         | 96.67%   | 1.50 min      | A100    |
 | 8    | gpt2-xl (1558M)    | pretrained | last                     | last_block       | longest train ex. (120)                                | 99.81%       | 99.33%         | 98.33%   | 2.83 min      | A100    |
-| 9    | gpt2-small (124M)  | random     | last                     | all              | longest train ex. (120)                                | 100%         | 96.64%         | 93.67%   | 0.69 min      | A100    |
+| 9    | gpt2-small (124M)  | random     | last                     | all              | longest train ex. (120)                                | 100.00%      | 96.64%         | 93.67%   | 0.69 min      | A100    |
 | 10   | gpt2-small (124M)  | pretrained | last                     | LoRA             | longest train ex. (120)                                | 100.00%      | 97.32%         | 96.67%   | 0.75 min      | A100    |
 | 11   | gpt2-small (124M)  | pretrained | last                     | last_block       | context length (1024)                                  | 83.08%       | 87.92%         | 78.33%   | 2.46 min      | A100    |
 | 12   | gpt2-small (124M)  | pretrained | last                     | last_block       | variable: no padding (batch size 1)                    | 100.00%      | 98.66%         | 98.00%   | 1.75 min      | A100    |
diff --git a/setup/03_optional-docker-environment/.devcontainer/Dockerfile b/setup/03_optional-docker-environment/.devcontainer/Dockerfile
index 6cfd708..7e0f697 100644
--- a/setup/03_optional-docker-environment/.devcontainer/Dockerfile
+++ b/setup/03_optional-docker-environment/.devcontainer/Dockerfile
@@ -4,6 +4,7 @@ RUN apt-get update && \
     apt-get upgrade -y && \
     apt-get install -y rsync && \
     apt-get install -y git && \
+    apt-get install -y curl && \
     rm -rf /var/lib/apt/lists/*
 
 COPY requirements.txt requirements.txt