diff --git a/3.4/Dockerfile b/3.4/Dockerfile
index 253ee084..e4b74f5a 100644
--- a/3.4/Dockerfile
+++ b/3.4/Dockerfile
@@ -15,6 +15,7 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		libsasl2-modules \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)
diff --git a/3.4/alpine/Dockerfile b/3.4/alpine/Dockerfile
index 1fd4851d..ffdd6168 100644
--- a/3.4/alpine/Dockerfile
+++ b/3.4/alpine/Dockerfile
@@ -19,6 +19,9 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		cyrus-sasl \
+		cyrus-sasl-plain \
+		cyrus-sasl-digestmd5 \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)
diff --git a/4.0/Dockerfile b/4.0/Dockerfile
index 3315ab01..0c970070 100644
--- a/4.0/Dockerfile
+++ b/4.0/Dockerfile
@@ -15,6 +15,7 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		libsasl2-modules \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)
diff --git a/4.0/alpine/Dockerfile b/4.0/alpine/Dockerfile
index 79bd1bb8..481b7415 100644
--- a/4.0/alpine/Dockerfile
+++ b/4.0/alpine/Dockerfile
@@ -19,6 +19,9 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		cyrus-sasl \
+		cyrus-sasl-plain \
+		cyrus-sasl-digestmd5 \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)
diff --git a/4.1/Dockerfile b/4.1/Dockerfile
index 21a49fde..304eaba0 100644
--- a/4.1/Dockerfile
+++ b/4.1/Dockerfile
@@ -15,6 +15,7 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		libsasl2-modules \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)
diff --git a/4.1/alpine/Dockerfile b/4.1/alpine/Dockerfile
index eb1e7e18..63aa07b7 100644
--- a/4.1/alpine/Dockerfile
+++ b/4.1/alpine/Dockerfile
@@ -19,6 +19,9 @@ RUN set -eux; \
 		mercurial \
 		openssh-client \
 		subversion \
+		cyrus-sasl \
+		cyrus-sasl-plain \
+		cyrus-sasl-digestmd5 \
 		\
 # we need "gsfonts" for generating PNGs of Gantt charts
 # and "ghostscript" for creating PDF thumbnails (in 4.1+)